The shell of Clypeoceras is laterally compressed, involute, discoidal; whorls strongly embracing and deeply indented by the next inner whorl, increasing rapidly in height. Sides slightly convex, sloping outward to a rather narrow venter, which may be angular or rounded but never with keels or grooves. Surface smooth or ornamented with radial striae and folds. Body chamber short.[1]
Suture ceratitic with deep asymmetric saddles and broad serrated lobes. Sutures have a Meekoceras stage produced during early growth with broad asymmetric saddles and narrower serrated lobes,[1] indicating a phylogenetic relationship.
Taxonomyedit
J.P Smith (1932)[1] placed Clypeoceas in the Meekoceratidae, indicated by the similarity of the shell with Meekoceras and the development of the suture, produced by septa, during growth. Smith (1932) however included the Meekoceratidae in the Prolecanitoidea whereas it is considered part of the Noritaceae in the Treatise, which includes Clypeoceras in the Paranoritidae instead.
Referencesedit
^ abcJ.P. Smith,1932. Lower Triassic Ammonoids of North America. US Geological Survey Professional Paper 167.
Arkell, et al., 1957. Mesocoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas Press.
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clypeoceras, genus, ammonites, with, involute, discoidal, shell, from, lower, triassic, temporal, range, early, triassic, scythian, scientific, classificationkingdom, animaliaphylum, molluscaclass, cephalopodasubclass, ammonoideaorder, ceratitidasuperfamily, n. Clypeoceras is a genus of ammonites with an involute discoidal shell from the Lower Triassic ClypeocerasTemporal range Early Triassic Scythian Scientific classificationKingdom AnimaliaPhylum MolluscaClass CephalopodaSubclass AmmonoideaOrder CeratitidaSuperfamily NoritoideaFamily MeekoceratidaeGenus ClypeocerasJ P Smith 1913Description editThe shell of Clypeoceras is laterally compressed involute discoidal whorls strongly embracing and deeply indented by the next inner whorl increasing rapidly in height Sides slightly convex sloping outward to a rather narrow venter which may be angular or rounded but never with keels or grooves Surface smooth or ornamented with radial striae and folds Body chamber short 1 Suture ceratitic with deep asymmetric saddles and broad serrated lobes Sutures have a Meekoceras stage produced during early growth with broad asymmetric saddles and narrower serrated lobes 1 indicating a phylogenetic relationship Taxonomy editJ P Smith 1932 1 placed Clypeoceas in the Meekoceratidae indicated by the similarity of the shell with Meekoceras and the development of the suture produced by septa during growth Smith 1932 however included the Meekoceratidae in the Prolecanitoidea whereas it is considered part of the Noritaceae in the Treatise which includes Clypeoceras in the Paranoritidae instead References edit a b c J P Smith 1932 Lower Triassic Ammonoids of North America US Geological Survey Professional Paper 167 Arkell et al 1957 Mesocoic Ammonoidea Treatise on Invertebrate Paleontology Part L Geological Society of America and University of Kansas Press nbsp This Ceratitida related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Clypeoceras amp oldid 1083368150, wikipedia, wiki, book, books, library,
