Misplaced Pages

#838161

81-424: Before the beginning of the tourist boom, Cala Bona was a village in a small natural harbour between Cap d'es Pinar and the peninsula of Punta de n'Amer. At that time the village only consisted of a pair of houses where a few families lived by fishing. The fishermen worked on the harbour and at sea, rowing and sailing their llaüts (small traditional Catalan wooden boats) to the surrounding rocky promontories, following

162-605: A streamlined body. Many flowers are also radially symmetric, or " actinomorphic ". Roughly identical floral structures – petals , sepals , and stamens – occur at regular intervals around the axis of the flower, which is often the female reproductive organ containing the carpel , style and stigma . Three-fold triradial symmetry was present in Trilobozoa from the Late Ediacaran period. Four-fold tetramerism appears in some jellyfish, such as Aurelia marginalis . This

243-406: A bottom surface, or a front and a back. George Cuvier classified animals with radial symmetry in the taxon Radiata ( Zoophytes ), which is now generally accepted to be an assemblage of different animal phyla that do not share a single common ancestor (a polyphyletic group). Most radially symmetric animals are symmetrical about an axis extending from the center of the oral surface, which contains

324-447: A distinct head and tail) is called cephalization . It is also argued that the development of an AP axis is important in locomotion – bilateral symmetry gives the body an intrinsic direction and allows streamlining to reduce drag . In addition to animals, the flowers of some plants also show bilateral symmetry. Such plants are referred to as zygomorphic and include the orchid ( Orchidaceae ) and pea ( Fabaceae ) families, and most of

405-404: A few of the millions caught every year, and due to their rarity, they usually are not eaten, instead being released back into the wild or donated to aquariums . Often, in cases of atypical coloring, there is a genetic factor, such as albinism or hermaphroditism . Special coloring does not appear to affect the lobster's taste once cooked; except for albinos, all lobsters possess astaxanthin, which

486-417: A food primarily available to the relatively well-off, at least among non-coastal dwellers. Lobster is first mentioned in cookbooks during the medieval period. Le Viandier de Taillevent , a French recipe collection written around 1300, suggests that lobster (also called saltwater crayfish) be “Cooked in wine and water, or in the oven; eaten in vinegar.” Le Viandier de Taillevent is considered to be one of

567-404: A handful exist from the medieval period. During the early 1400s, lobster was still a popular dish among the upper classes. During this time, influential households used the variety and variation of species served at feasts to display wealth and prestige. Lobster was commonly found among these spreads, indicating that it continued to be held in high esteem among the wealthy. In one notable instance,

648-431: A low-priced canned staple food. As a crustacean, lobster remains a taboo food in the dietary laws of Judaism and certain streams of Islam . Caught lobsters are graded as new-shell, hard-shell, or old-shell. Because lobsters that have recently shed their shells are the most delicate, an inverse relationship exists between the price of American lobster and its flavor. New-shell lobsters have paper-thin shells and

729-451: A main shopping street. Along the Cala Bona seafront are three rocky beaches protected by artificial breakwaters. The town's sandy beach has a length of 550 metres and a width of 9 metres, and is located south of the harbour. The main beach has been certified by AENOR to UNE 170001 standard for universal accessibility, making it suitable for people with disabilities. In 2006, both the beach and

810-532: A number of species of Radiolaria , some of whose skeletons are shaped like various regular polyhedra. Examples include Circoporus octahedrus , Circogonia icosahedra , Lithocubus geometricus and Circorrhegma dodecahedra . The shapes of these creatures should be obvious from their names. Tetrahedral symmetry is not present in Callimitra agnesae . Spherical symmetry is characterised by the ability to draw an endless, or great but finite, number of symmetry axes through

891-487: A particular direction. This creates a unidirectional flow of signalling molecules causing these signals to accumulate on one side of the embryo and not the other. This results in the activation of different developmental pathways on each side, and subsequent asymmetry. Much of the investigation of the genetic basis of symmetry breaking has been done on chick embryos. In chick embryos the left side expresses genes called NODAL and LEFTY2 that activate PITX2 to signal

SECTION 10

#1733085109839

972-464: A popular mid-range delicacy during the mid to late Roman period . The price of lobster could vary widely due to various factors, but evidence indicates that lobster was regularly transported inland over long distances to meet popular demand. A mosaic found in the ruins of Pompeii suggests that the spiny lobster was of considerable interest to the Roman population during the early imperial period. Lobster

1053-400: A repeating pattern around a central axis such that they can be separated into several identical pieces when cut through the central point, much like pieces of a pie. Typically, this involves repeating a body part 4, 5, 6 or 8 times around the axis – referred to as tetramerism, pentamerism, hexamerism and octamerism, respectively. Such organisms exhibit no left or right sides but do have a top and

1134-466: A sea procession in honour of the patron saint of sailors Nostra Senyora del Carme . Near Cala Bona further south are the towns of Sa Coma and Porto Cristo , as well as the Caves of Drach which are one of the island's most visited attractions. 39°36′46″N 3°23′25″E  /  39.61278°N 3.39028°E  / 39.61278; 3.39028 Lobster Lobsters are malacostracans of

1215-458: A stab into the brain ( pithing ), in the belief that this will stop suffering. However, a lobster's brain operates from not one but several ganglia , and disabling only the frontal ganglion does not usually result in death. The boiling method is illegal in some places, such as in Italy, where offenders face fines up to €495. Lobsters can be killed by electrocution prior to cooking with a device called

1296-480: A worse meat-to-shell ratio, but the meat is very sweet. However, the lobsters are so delicate that even transport to Boston almost kills them, making the market for new-shell lobsters strictly local to the fishing towns where they are offloaded. Hard-shell lobsters with firm shells but less sweet meat can survive shipping to Boston, New York, and even Los Angeles, so they command a higher price than new-shell lobsters. Meanwhile, old-shell lobsters, which have not shed since

1377-447: Is a severe over-simplification as bacterial cells can be curved, bent, flattened, oblong spheroids and many more shapes. Due to the huge number of bacteria considered to be cocci (coccus if a single cell), it is unlikely that all of these show true spherical symmetry. It is important to distinguish between the generalized use of the word 'spherical' to describe organisms at ease, and the true meaning of spherical symmetry. The same situation

1458-495: Is an anterior – posterior (AP) axis which can be visualised as an imaginary axis running from the head or mouth to the tail or other end of an organism. The second is the dorsal – ventral (DV) axis which runs perpendicular to the AP axis. During development the AP axis is always specified before the DV axis, which is known as the second embryonic axis . The AP axis is essential in defining

1539-533: Is due to the expression of CYCLOIDEA genes. Evidence for the role of the CYCLOIDEA gene family comes from mutations in these genes which cause a reversion to radial symmetry. The CYCLOIDEA genes encode transcription factors , proteins which control the expression of other genes. This allows their expression to influence developmental pathways relating to symmetry. For example, in Antirrhinum majus , CYCLOIDEA

1620-407: Is expressed during early development in the dorsal domain of the flower meristem and continues to be expressed later on in the dorsal petals to control their size and shape. It is believed that the evolution of specialized pollinators may play a part in the transition of radially symmetrical flowers to bilaterally symmetrical flowers. Symmetry is often selected for in the evolution of animals. This

1701-484: Is found in lobster stomachs, this is not necessarily evidence of cannibalism because lobsters eat their shed skin after moulting. While cannibalism was thought to be nonexistent among wild lobster populations, it was observed in 2012 by researchers studying wild lobsters in Maine. These first known instances of lobster cannibalism in the wild are theorized to be attributed to a local population explosion among lobsters caused by

SECTION 20

#1733085109839

1782-429: Is illustrated by the fact that groups of animals have traditionally been defined by this feature in taxonomic groupings. The Radiata , animals with radial symmetry, formed one of the four branches of Georges Cuvier 's classification of the animal kingdom . Meanwhile, Bilateria is a taxonomic grouping still used today to represent organisms with embryonic bilateral symmetry. Organisms with radial symmetry show

1863-400: Is immediately obvious when looking at the jellyfish due to the presence of four gonads , visible through its translucent body. This radial symmetry is ecologically important in allowing the jellyfish to detect and respond to stimuli (mainly food and danger) from all directions. Flowering plants show five-fold pentamerism, in many of their flowers and fruits. This is easily seen through

1944-430: Is known to be under selection, the evolutionary history of different types of symmetry in animals is an area of extensive debate. Traditionally it has been suggested that bilateral animals evolved from a radial ancestor . Cnidarians , a phylum containing animals with radial symmetry, are the most closely related group to the bilaterians. Cnidarians are one of two groups of early animals considered to have defined structure,

2025-442: Is more common than originally accounted for. Like all the traits of organisms, symmetry (or indeed asymmetry) evolves due to an advantage to the organism – a process of natural selection . This involves changes in the frequency of symmetry-related genes throughout time. Early flowering plants had radially symmetric flowers but since then many plants have evolved bilaterally symmetrical flowers. The evolution of bilateral symmetry

2106-566: Is responsible for the bright red color lobsters turn after being cooked. Lobsters live up to an estimated 45 to 50 years in the wild, although determining age is difficult: it is typically estimated from size and other variables. Newer techniques may lead to more accurate age estimates. Research suggests that lobsters may not slow down, weaken, or lose fertility with age and that older lobsters may be more fertile than younger lobsters. This longevity may be due to telomerase , an enzyme that repairs long repetitive sections of DNA sequences at

2187-415: Is seen in the description of viruses – 'spherical' viruses do not necessarily show spherical symmetry, being usually icosahedral. Organisms with bilateral symmetry contain a single plane of symmetry, the sagittal plane , which divides the organism into two roughly mirror image left and right halves – approximate reflectional symmetry. Animals with bilateral symmetry are classified into a large group called

2268-400: Is similar to its predecessor in that it indicates the popularity of lobster as a food among the upper classes. That lobster was first mentioned in cookbooks during the 1300s and only mentioned in two during this century should not be taken as an implication that lobster was not widely consumed before or during this time. Recipe collections were virtually non-existent before the 1300s, and only

2349-503: Is that an ancestral animal had no symmetry (was asymmetric) before cnidarians and bilaterians separated into different evolutionary lineages . Radial symmetry could have then evolved in cnidarians and bilateral symmetry in bilaterians. Alternatively, the second suggestion is that an ancestor of cnidarians and bilaterians had bilateral symmetry before the cnidarians evolved and became different by having radial symmetry. Both potential explanations are being explored and evidence continues to fuel

2430-427: Is unsurprising since asymmetry is often an indication of unfitness – either defects during development or injuries throughout a lifetime. This is most apparent during mating during which females of some species select males with highly symmetrical features. Additionally, female barn swallows , a species where adults have long tail streamers, prefer to mate with males that have the most symmetrical tails. While symmetry

2511-474: The Bishop of Salisbury offered at least 42 kinds of crustaceans and fish at his feasts over nine months, including several varieties of lobster. However, lobster was not a food exclusively accessed by the wealthy. The general population living on the coasts made use of the various food sources provided by the ocean, and shellfish especially became a more popular source of nutrition. Among the general population, lobster

Cala Bona - Misplaced Pages Continue

2592-485: The Canadian Maritimes . Some servants specified in employment agreements that they would not eat lobster more than twice per week, however there is limited evidence for this. Lobster was also commonly served in prisons, much to the displeasure of inmates. American lobster was initially deemed worthy only of being used as fertilizer or fish bait, and until well into the 20th century, it was not viewed as more than

2673-648: The CrustaStun . Since March 2018, lobsters in Switzerland need to be knocked out, or killed instantly, before they are boiled. They also receive other forms of protection while in transit. Lobsters are caught using baited one-way traps with a color-coded marker buoy to mark cages. Lobster is fished in water between 2 and 900 metres (1 and 500 fathoms), although some lobsters live at 3,700 metres (2,000 fathoms). Cages are of plastic-coated galvanized steel or wood. A lobster fisher may tend to as many as 2,000 traps. Around

2754-450: The bilateria , which contains 99% of all animals (comprising over 32 phyla and 1 million described species). All bilaterians have some asymmetrical features; for example, the human heart and liver are positioned asymmetrically despite the body having external bilateral symmetry. The bilateral symmetry of bilaterians is a complex trait which develops due to the expression of many genes . The bilateria have two axes of polarity . The first

2835-419: The body plans of most multicellular organisms exhibit, and are defined by, some form of symmetry. There are only a few types of symmetry which are possible in body plans. These are radial (cylindrical) symmetry, bilateral , biradial and spherical symmetry. While the classification of viruses as an "organism" remains controversial, viruses also contain icosahedral symmetry . The importance of symmetry

2916-655: The corals and sea anemones (class Anthozoa ), which are divided into two groups based on their symmetry. The most common corals in the subclass Hexacorallia have a hexameric body plan; their polyps have six-fold internal symmetry and a number of tentacles that is a multiple of six. Octamerism is found in corals of the subclass Octocorallia . These have polyps with eight tentacles and octameric radial symmetry. The octopus , however, has bilateral symmetry, despite its eight arms. Icosahedral symmetry occurs in an organism which contains 60 subunits generated by 20 faces, each an equilateral triangle , and 12 corners. Within

2997-496: The family Nephropidae or its synonym Homaridae . They have long bodies with muscular tails and live in crevices or burrows on the sea floor. Three of their five pairs of legs have claws, including the first pair, which are usually much larger than the others. Highly prized as seafood , lobsters are economically important and are often one of the most profitable commodities in the coastal areas they populate. Commercially important species include two species of Homarus from

3078-402: The icosahedron there is 2-fold, 3-fold and 5-fold symmetry . Many viruses, including canine parvovirus , show this form of symmetry due to the presence of an icosahedral viral shell . Such symmetry has evolved because it allows the viral particle to be built up of repetitive subunits consisting of a limited number of structural proteins (encoded by viral genes ), thereby saving space in

3159-471: The reef lobsters and the three families of freshwater crayfish . Lobsters are invertebrates with a hard protective exoskeleton . Like most arthropods , lobsters must shed to grow, which leaves them vulnerable. During the shedding process, several species change color. Lobsters have eight walking legs; the front three pairs bear claws, the first of which are larger than the others. The front pincers are also biologically considered legs, so they belong in

3240-434: The anatomical asymmetry which we observe. These levels include asymmetric gene expression, protein expression, and activity of cells. For example, left–right asymmetry in mammals has been investigated extensively in the embryos of mice. Such studies have led to support for the nodal flow hypothesis. In a region of the embryo referred to as the node there are small hair-like structures ( monocilia ) that all rotate together in

3321-403: The arrangement of five carpels (seed pockets) in an apple when cut transversely . Among animals, only the echinoderms such as sea stars , sea urchins , and sea lilies are pentamerous as adults, with five arms arranged around the mouth. Being bilaterian animals, however, they initially develop with mirror symmetry as larvae, then gain pentaradial symmetry later. Hexamerism is found in

Cala Bona - Misplaced Pages Continue

3402-471: The body of an organism. Importantly, unlike in mathematics, symmetry in biology is always approximate. For example, plant leaves – while considered symmetrical – rarely match up exactly when folded in half. Symmetry is one class of patterns in nature whereby there is near-repetition of the pattern element, either by reflection or rotation . While sponges and placozoans represent two groups of animals which do not show any symmetry (i.e. are asymmetrical),

3483-567: The body. This means that spherical symmetry occurs in an organism if it is able to be cut into two identical halves through any cut that runs through the organism's center. True spherical symmetry is not found in animal body plans. Organisms which show approximate spherical symmetry include the freshwater green alga Volvox . Bacteria are often referred to as having a 'spherical' shape. Bacteria are categorized based on their shapes into three classes: cocci (spherical-shaped), bacillus (rod-shaped) and spirochetes (spiral-shaped) cells. In reality, this

3564-435: The breeding lobsters . In 1924 the first guest house opened, a place called "Cap Cupe" which later became the "Hotel Cala Bona". Following the arrival of tourism, the area began to be urbanized with hotels, restaurants and homes. Along with the neighbouring village of Cala Millor, Cala Bona grew from the 60s onwards into a significant holiday resort. The port and promenade were redesigned and expanded in 2006. The harbourmaster

3645-458: The debate. Although asymmetry is typically associated with being unfit, some species have evolved to be asymmetrical as an important adaptation . Many members of the phylum Porifera (sponges) have no symmetry, though some are radially symmetric. The presence of these asymmetrical features requires a process of symmetry breaking during development, both in plants and animals. Symmetry breaking occurs at several different levels in order to generate

3726-464: The development of left side structures. Whereas, the right side does not express PITX2 and consequently develops right side structures. A more complete pathway is shown in the image at the side of the page. For more information about symmetry breaking in animals please refer to the left–right asymmetry page. Plants also show asymmetry. For example the direction of helical growth in Arabidopsis ,

3807-420: The disappearance of many of the Maine lobsters' natural predators. In general, lobsters are 25–50 cm (10–20 in) long and move by slowly walking on the sea floor. However, they swim backward quickly when they flee by curling and uncurling their abdomens . A speed of 5 m/s (11 mph) has been recorded. This is known as the caridoid escape reaction . Symbiotic animals of the genus Symbion ,

3888-429: The ends of chromosomes, referred to as telomeres . Telomerase is expressed by most vertebrates during embryonic stages but is generally absent from adult stages of life. However, unlike most vertebrates, lobsters express telomerase as adults through most tissue, which has been suggested to be related to their longevity. Telomerase is especially present in green spotted lobsters, whose markings are thought to be produced by

3969-569: The enzyme interacting with their shell pigmentation. Lobster longevity is limited by their size. Moulting requires metabolic energy, and the larger the lobster, the more energy is needed; 10 to 15% of lobsters die of exhaustion during moulting, while in older lobsters, moulting ceases and the exoskeleton degrades or collapses entirely, leading to death. Like many decapod crustaceans, lobsters grow throughout life and can add new muscle cells at each moult. Lobster longevity allows them to reach impressive sizes. According to Guinness World Records ,

4050-496: The evolution of bilateral symmetry from a radially symmetric ancestor. The animal group with the most obvious biradial symmetry is the ctenophores . In ctenophores the two planes of symmetry are (1) the plane of the tentacles and (2) the plane of the pharynx. In addition to this group, evidence for biradial symmetry has even been found in the 'perfectly radial' freshwater polyp Hydra (a cnidarian). Biradial symmetry, especially when considering both internal and external features,

4131-449: The face of a human being has a plane of symmetry down its centre, or a pine cone displays a clear symmetrical spiral pattern. Internal features can also show symmetry, for example the tubes in the human body (responsible for transporting gases , nutrients , and waste products) which are cylindrical and have several planes of symmetry. Biological symmetry can be thought of as a balanced distribution of duplicate body parts or shapes within

SECTION 50

#1733085109839

4212-480: The family Nephropidae are similar in overall form to several other related groups. They differ from freshwater crayfish in lacking the joint between the last two segments of the thorax, and they differ from the reef lobsters of the family Enoplometopidae in having full claws on the first three pairs of legs, rather than just one. The distinctions from fossil families such as the Chilenophoberidae are based on

4293-447: The figwort family ( Scrophulariaceae ). The leaves of plants also commonly show approximate bilateral symmetry. Biradial symmetry is found in organisms which show morphological features (internal or external) of both bilateral and radial symmetry. Unlike radially symmetrical organisms which can be divided equally along many planes, biradial organisms can only be cut equally along two planes. This could represent an intermediate stage in

4374-637: The first and second maxillae . The head also bears the (usually stalked) compound eyes . Because lobsters live in murky environments at the bottom of the ocean, they mostly use their antennae as sensors. The lobster eye has a reflective structure above a convex retina. In contrast, most complex eyes use refractive ray concentrators (lenses) and a concave retina. The lobster's thorax is composed of maxillipeds , appendages that function primarily as mouthparts, and pereiopods , appendages that serve for walking and for gathering food. The abdomen includes pleopods (also known as swimmerets ), used for swimming, as well as

4455-453: The first “haute cuisine” cookbooks, advising on how to cook meals that would have been quite elaborate for the period and making usage of expensive and hard to obtain ingredients. Though the original edition, which includes the recipe for lobster, was published before the birth of French court cook Guillaume Tirel , Tirel later expanded and republished this recipe collection, suggesting that the recipes included in both editions were popular among

4536-616: The harbour received a Blue Flag beach award for water quality from the Ministry of the Environment in Madrid . The expansion of the port has also allowed for the provision of tour boats for the enjoyment of holidaymakers staying in the East Majorca area. Hiking trails run from the town itself, and there are also opportunities for diving and fishing. On 16 July in Cala Bona there are celebrations and

4617-513: The highest circles of French nobility, including King Philip VI. The inclusion of a lobster recipe in this cookbook, especially one which does not make use of other more expensive ingredients, attests to the popularity of lobster among the wealthy. The French household guidebook Le Ménagier de Paris , published in 1393, includes no less than five recipes including lobster, which vary in elaboration. A guidebook intended to provide advice for women running upper-class households, Le Ménagier de Paris

4698-512: The influence of the Church and the government regulating and sometimes banning meat consumption during certain periods continued to encourage the popularity of seafood, especially shellfish, as a meat alternative among all classes. Throughout this period, lobster was eaten fresh, pickled , and salted . From the late 17th century onward, developments in fishing, transportation, and cooking technology allowed lobster to more easily make its way inland, and

4779-784: The largest lobster ever caught was in Nova Scotia , Canada, weighing 20.15 kilograms (44.4 lb). Lobsters live in all oceans, on rocky, sandy, or muddy bottoms from the shoreline to beyond the edge of the continental shelf , contingent largely on size and age. Smaller, younger lobsters are typically found in crevices or in burrows under rocks and do not typically migrate. Larger, older lobsters are more likely to be found in deeper seas, migrating back to shallow waters seasonally. Lobsters are omnivores and typically eat live prey such as fish, mollusks, other crustaceans, worms, and some plant life. They scavenge if necessary and are known to resort to cannibalism in captivity. However, when lobster skin

4860-433: The meat with lobster picks . The meat is often eaten with melted butter and lemon juice . Lobster is also used in soup, bisque , lobster rolls , cappon magro , and dishes such as lobster Newberg and lobster Thermidor . Cooks boil or steam live lobsters. When a lobster is cooked, its shell's color changes from brown to orange because the heat from cooking breaks down a protein called crustacyanin , which suppresses

4941-482: The mid-19th century when New Yorkers and Bostonians developed a taste for it, and commercial lobster fisheries only flourished after the development of the lobster smack , a custom-made boat with open holding wells on the deck to keep the lobsters alive during transport. Before this time, lobster was considered a poverty food or as a food for indentured servants or lower members of society in Maine , Massachusetts , and

SECTION 60

#1733085109839

5022-608: The most commonly studied model plant, shows left-handedness. Interestingly, the genes involved in this asymmetry are similar (closely related) to those in animal asymmetry – both LEFTY1 and LEFTY2 play a role. In the same way as animals, symmetry breaking in plants can occur at a molecular (genes/proteins), subcellular, cellular, tissue and organ level. Fluctuating asymmetry (FA), is a form of biological asymmetry , along with anti-symmetry and direction asymmetry. Fluctuating asymmetry refers to small, random deviations away from perfect bilateral symmetry. This deviation from perfection

5103-566: The mouth, to the center of the opposite (aboral) end. Animals in the phyla Cnidaria and Echinodermata generally show radial symmetry, although many sea anemones and some corals within the Cnidaria have bilateral symmetry defined by a single structure, the siphonoglyph . Radial symmetry is especially suitable for sessile animals such as the sea anemone, floating animals such as jellyfish , and slow moving organisms such as starfish ; whereas bilateral symmetry favours locomotion by generating

5184-697: The northern Atlantic Ocean and scampi (which look more like a shrimp , or a "mini lobster")—the Northern Hemisphere genus Nephrops and the Southern Hemisphere genus Metanephrops . Although several other groups of crustaceans have the word "lobster" in their names, the unqualified term "lobster" generally refers to the clawed lobsters of the family Nephropidae. Clawed lobsters are not closely related to spiny lobsters or slipper lobsters , which have no claws ( chelae ), or to squat lobsters . The most similar living relatives of clawed lobsters are

5265-494: The only known member of the phylum Cycliophora , live exclusively on lobster gills and mouthparts. Different species of Symbion have been found on the three commercially important lobsters of the North Atlantic Ocean: Nephrops norvegicus , Homarus gammarus , and Homarus americanus . Lobster is commonly served boiled or steamed in the shell. Diners crack the shell with lobster crackers and fish out

5346-596: The orange hue of the chemical astaxanthin , which is also found in the shell. According to the United States Food and Drug Administration (FDA), the mean level of mercury in American lobster between 2005 and 2007 was 0.107   ppm . Humans are claimed to have eaten lobster since early history. Large piles of lobster shells near areas populated by fishing communities attest to the crustacean's extreme popularity during this period. Evidence indicates that lobster

5427-424: The order Decapods ("ten-footed"). Although lobsters are largely bilaterally symmetrical like most other arthropods, some genera possess unequal, specialized claws. Lobster anatomy includes two main body parts: the cephalothorax and the abdomen . The cephalothorax fuses the head and the thorax , both of which are covered by a chitinous carapace . The lobster's head bears antennae , antennules, mandibles ,

5508-482: The overall increase in marine activity due to the development of better boats and the increasing cultural investment in building ships and training sailors. The consumption of marine life went up overall in this period, and the consumption of lobster went up in accordance with this general trend. Unlike fish, however, lobster had to be cooked within two days of leaving salt water, limiting the availability of lobster for inland dwellers. Thus lobster, more than fish, became

5589-464: The pattern of grooves on the carapace. Analysis of the neural gene complement revealed extraordinary development of the chemosensory machinery, including a profound diversification of ligand-gated ion channels and secretory molecules. Typically, lobsters are dark colored, either bluish-green or greenish-brown, to blend in with the ocean floor, but they can be found in many colors. Lobsters with atypical coloring are extremely rare, accounting for only

5670-475: The polarity of bilateria and allowing the development of a front and back to give the organism direction. The front end encounters the environment before the rest of the body so sensory organs such as eyes tend to be clustered there. This is also the site where a mouth develops since it is the first part of the body to encounter food. Therefore, a distinct head, with sense organs connected to a central nervous system, tends to develop. This pattern of development (with

5751-474: The previous season and have a coarser flavor, can be air-shipped anywhere in the world and arrive alive, making them the most expensive. Several methods are used for killing lobsters. The most common way of killing lobsters is by placing them live in boiling water, sometimes after being placed in a freezer for a period. Another method is to split the lobster or sever the body in half lengthwise. Lobsters may also be killed or immobilized immediately before boiling by

5832-418: The second being the ctenophores . Ctenophores show biradial symmetry leading to the suggestion that they represent an intermediate step in the evolution of bilateral symmetry from radial symmetry. Interpretations based only on morphology are not sufficient to explain the evolution of symmetry. Two different explanations are proposed for the different symmetries in cnidarians and bilateria. The first suggestion

5913-410: The tail fan, composed of uropods and the telson . Lobsters, like snails and spiders, have blue blood due to the presence of hemocyanin , which contains copper . In contrast, vertebrates, and many other animals have red blood from iron -rich hemoglobin . Lobsters possess a green hepatopancreas , called the tomalley by chefs, which functions as the animal's liver and pancreas . Lobsters of

5994-491: The variety of dishes involving lobster and cooking techniques used with the ingredient expanded. However, these developments coincided with a decrease in the lobster population, and lobster increasingly became a delicacy food, valued among the rich as a status symbol and less likely to be found in the diet of the general population. The American lobster was not originally popular among European colonists in North America. This

6075-488: The viral genome . The icosahedral symmetry can still be maintained with more than 60 subunits, but only in multiples of 60. For example, the T=3 Tomato bushy stunt virus has 60x3 protein subunits (180 copies of the same structural protein). Although these viruses are often referred to as 'spherical', they do not show true mathematical spherical symmetry. In the early 20th century, Ernst Haeckel described (Haeckel, 1904)

6156-632: The year 2000, owing to overfishing and high demand, lobster aquaculture expanded. The fossil record of clawed lobsters extends back at least to the Valanginian age of the Cretaceous (140 million years ago). This list contains all 54 extant species in the family Nephropidae : Bilateral symmetry Symmetry in biology refers to the symmetry observed in organisms , including plants, animals, fungi , and bacteria . External symmetry can be easily seen by just looking at an organism. For example,

6237-534: Was a popular food among the Moche people of Peru between 50 CE and 800 CE. Besides its use as food, lobster shells were also used to create a light pink dye, ornaments, and tools. A mass-produced lobster-shaped effigy vessel dated to this period attests to lobster's popularity at this time, though the purpose of this vessel has not been identified. The Viking period saw an increase in lobster and other shellfish consumption among northern Europeans. This can be attributed to

6318-495: Was being consumed as a regular food product in fishing communities along the shores of Britain, South Africa, Australia, and Papua New Guinea years ago. Lobster became a significant source of nutrients among European coastal dwellers. Historians suggest lobster was an important secondary food source for most European coastal dwellers, and it was a primary food source for coastal communities in Britain during this time. Lobster became

6399-418: Was generally eaten boiled during the mid-15th century, but the influence of the cuisine of higher society can be seen in that it was now also regularly eaten cold with vinegar. The inland peasantry would still have generally been unfamiliar with lobster during this time. Lobster continued to be eaten as a delicacy and a general staple food among coastal communities until the late 17th century. During this time,

6480-470: Was given a new building and a fuel station for leisure boats was built. Cala Bona and Cala Millor are now connected by hotels and catering establishments. In recent years the number of hotel rooms in Cala Bona has increased considerably. Many of the tourists who stay in Cala Bona, unlike those in Cala Millor, are of British origin. In addition to the town's 14 hotels there are numerous bars and restaurants and

6561-522: Was partially due to the European inlander's association of lobster with barely edible salted seafood and partially due to a cultural opinion that seafood was a lesser alternative to meat that did not provide the taste or nutrients desired. It was also due to the extreme abundance of lobster at the time of the colonists' arrival, which contributed to a general perception of lobster as an undesirable peasant food. The American lobster did not achieve popularity until

#838161