Peter Ax (March 29, 1927 – May 2, 2013) was a German zoologist. His main work concerned the investigation of interstitial fauna and the exposition of a phylogenetic system for the animals .
6-521: Eubilateria Ax , 1987 Nephrozoa is a proposed major clade of bilaterian animals . It includes all bilaterians other than Xenacoelomorpha . It contrasts with the Xenambulacraria hypothesis, which instead posits that Xenacoelomorpha is most closely related to Ambulacraria . Which hypothesis is correct is controversial. Authors supporting the Xenambulacraria hypothesis have suggested that
12-836: A guest scientist at the Friday Harbor Laboratories of the University of Washington , at the marine biological stations in Arcachon , Banyuls-sur-Mer , and Naples , and at the Darwin Station on the Galapagos Islands . He was a member of the Akademie der Wissenschaften und der Literatur in Mainz , a fellow at the Institute for Advanced Study, Berlin in 1986/87, and an honorary member of
18-562: The Oberschule für Jungen in Hamburg until 1944 and subsequently completed his military service. He studied biology at the University of Kiel from 1946, and graduated with a doctorate in 1950. From 1952 to 1961, he was employed as a scientific worker at the same university. He gained his habilitation in 1955, and worked as a Dozent . In 1961, he went to the University of Göttingen , where he held
24-468: The chair in Morphology and Systematic Zoology. He remained there until his retirement as an emeritus professor in 1992. Peter Ax worked primarily on the micro- and meiofauna of the interstitial environment in marine sediments, and on the systematics of flatworms . He described an array of hitherto unknown species from this environment, including Diplosoma micans , the first tunicate to be found in
30-466: The genetic evidence used to support Nephrozoa may be due to systematic error. Below is a proposed phylogenetic tree of Nephrozoa: Xenacoelomorpha [REDACTED] Chordata [REDACTED] Echinodermata [REDACTED] Hemichordata [REDACTED] Ecdysozoa [REDACTED] Spiralia [REDACTED] This zoology –related article is a stub . You can help Misplaced Pages by expanding it . Peter Ax Peter Ax attended
36-544: The interstitial habitat, in 1970. In 1956 he was the first to describe the Gnathostomulida , which was also found from this habitat. Through his works such as Das phylogenetische System (1984) and the three-volume Das System der Metazoa (1995-2001), he also became known as one of the important exponents of phylogenetic systematics in Germany. Peter Ax was the founding editor of the journal Mikrofauna marina . He worked as
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