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A cephalopod / ˈ s ɛ f ə l ə p ɒ d / is ... for instance, radulae have only been found in nine of the 43 ammonite genera, [106] and they are rarer still in non ...
The cephalopods were once thought to have evolved from a monoplacophoran-like ancestor [8] with a curved, tapering shell, [9] and to be closely related to the gastropods (snails). [10] The similarity of the early shelled cephalopod Plectronoceras to some gastropods was used to support this view.
Prehistoric cephalopod genera (2 C, 73 P) T. Todarodes (6 P) U. Uroteuthis (10 P) Pages in category "Cephalopod genera"
Pages in category "Prehistoric cephalopod genera" The following 73 pages are in this category, out of 73 total. This list may not reflect recent changes. A.
Ctenobactrites is an extinct genus of cephalopods that lived from the Carboniferous to the Permian. It contains seven valid species which have been found in Europe, Asia, and North America. [9] It was originally assigned to the order Bactritida, [1] but has been proposed to be a potential member of the order Mixosiphonata. [10]
The Cymatoceratidae is a family of Mesozoic and early Cenozoic nautiloid cephalopods and the most abundant of their kind in the Cretaceous. They are characterized by ribbed, generally involute shells of varied forms - coiled such that the outer whorl envelops the previous one, as with Nautilus, and sutures that are variably sinuous.
Endocerida is an extinct nautiloid order, a group of cephalopods from the Lower Paleozoic with cone-like deposits in their siphuncle. Endocerida was a diverse group of cephalopods that lived from the Early Ordovician possibly to the Late Silurian. Their shells were variable in form.
Pages in category "Prehistoric nautiloid genera" The following 200 pages are in this category, out of approximately 300 total. This list may not reflect recent changes .