4-585: See text Hoplitoidea , formerly Hoplitaceae , is a superfamily of mostly Upper Cretaceous ammonites comprising families united by a similar suture pattern with multiple similar elements that tend to decrease in size going toward the umbilicus, at the inner edge of any whorl, and which are typically in a straight line. Sutural elements are commonly ammonitic, but in some saddles and in others both saddles and lobes are smooth and undivided. Shells are variable in form, both ribbed, evolute forms and smooth, involute forms are included. Families regarded as part now include
8-788: Is a stub . You can help Misplaced Pages by expanding it . Engonoceratidae Engonoceratidae is a family of typically compressed, more or less flat sided and involute ammonites (cephalopod order Ammonitida ) from the mid Cretaceous belonging to the Hoplitoidea. shells have flat sided outer rims ( venters), at least in some stage. Single or branching irregular ribs and variably placed tubercles may occur. Sutures have numerous auxiliary and adventive elements of similar form, in general radially arranged. Forwardly divergent saddles tend to be simple, without subdivision. Lobes, pointing apically, may be simple and undivided or may be frilled with short irregular serrations. Some classifications go so far as to put
12-730: The Engonoceratidae , Hoplitidae , Placenticeratidae , and Schloenbachiidae . Some classifications however include the Forbesiceridae in place of the Engonoceratidae The older version of the Treatise includes in addition to the five families already mentioned, the Pulchelliidae , Trochleiceratidae , Douvilleiceratidae , Deshayesitidae , and Leymeriellidae , which have since been reassigned. This Ammonitina -related article
16-915: The Engonoceratidae in its own superfamily, the Engonoceratoidea (.i.e. Engonocerataceae) although its direct descendant the Placenticeratidae is retained in the Hoplitoidea. The Engonoceratidae first appear in the lower Albian . Origin in the Desheyesitidae has been suggested, but seems unlikely even without the Desheyesitidae being removed to the Ancyloceratina . Derivation from the Hoplitidae seems more likely, from something like Cleoniceras or Aioloceras by simplification and evening out of
#851148