Cassinoceras is characterized by short, laterally compressed, rapidly expanding shells in which the upper, dorsal, surface has a convex curvature and diverges strongly from the essentially straight lower, ventral surface. The siphuncle which entirely fills the apical portion at the back of the shell is also compressed and vertically expanding, and is filled with simple endocones with a complex system of endosiphuncular blades through which a flattened endosiphuncular tube with widely spaced partitions runs.[1] The shell of Cassinoceras grew to about 25 to 30 cm long.[2]
Cassinoceras was named by Ulrich & Foerste in 1936 for the Fort Cassin Limestone of western Vermont, from which the upper stage of the Canadian Epoch, known as the Cassinian gets its name. The genotype is Cassinoceras explanator (Whitfield). A second species Cassinoceras grande Ulrich & Foerste is also known from the Fort Cassin Limestone. The genus has also been found in Newfoundland, the Arctic islands, and on Spitsbergen.
Referencesedit
^ abTeichert, Curt, 1964. Endoceratoidea inTreatise on Invertebrate Paleontology Part K Mollusca 3; Geological Soc. of America and Univ of Kansas Press; pp K171-K172, Piloceratidae.
^Moore, Raymond C., Lalicker, Cecil G., & Fischer, Alfred G. 1952. Invertebrate Fossils. McGraw-Hill, New York. Page 355
This prehistoric nautiloid-related article is a stub. You can help Wikipedia by expanding it.
cassinoceras, cassin, horn, genus, nautiloids, belonging, endocerid, family, piloceratidae, that, comes, from, late, early, ordovician, eastern, north, america, adjacent, territories, temporal, range, early, ordovician, preꞒ, scientific, classification, domain. Cassinoceras Cassin Horn is a genus of nautiloids belonging to the endocerid family Piloceratidae that comes from the late Early Ordovician of eastern North America and adjacent territories 1 CassinocerasTemporal range Early Ordovician PreꞒ Ꞓ O S D C P T J K Pg N Scientific classification Domain Eukaryota Kingdom Animalia Phylum Mollusca Class Cephalopoda Subclass Nautiloidea Order Bisonocerida Family Piloceratidae Genus CassinocerasUlrich amp Foerste 1936 Cassinoceras is characterized by short laterally compressed rapidly expanding shells in which the upper dorsal surface has a convex curvature and diverges strongly from the essentially straight lower ventral surface The siphuncle which entirely fills the apical portion at the back of the shell is also compressed and vertically expanding and is filled with simple endocones with a complex system of endosiphuncular blades through which a flattened endosiphuncular tube with widely spaced partitions runs 1 The shell of Cassinoceras grew to about 25 to 30 cm long 2 Cassinoceras was named by Ulrich amp Foerste in 1936 for the Fort Cassin Limestone of western Vermont from which the upper stage of the Canadian Epoch known as the Cassinian gets its name The genotype is Cassinoceras explanator Whitfield A second species Cassinoceras grande Ulrich amp Foerste is also known from the Fort Cassin Limestone The genus has also been found in Newfoundland the Arctic islands and on Spitsbergen References edit a b Teichert Curt 1964 Endoceratoidea in Treatise on Invertebrate Paleontology Part K Mollusca 3 Geological Soc of America and Univ of Kansas Press pp K171 K172 Piloceratidae Moore Raymond C Lalicker Cecil G amp Fischer Alfred G 1952 Invertebrate Fossils McGraw Hill New York Page 355 nbsp This prehistoric nautiloid related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Cassinoceras amp oldid 1051502046, wikipedia, wiki, book, books, library,
