""'Joldagiroceras " "'is an nautiloid cephalopods characterized generally by long straight shells with narrow central siphuncles.
22.
""'Ukhtoceras " "'is a cephalopod genus included in the nautiloid order Discosorida that lived during the Devonian.
23.
""'Vasalemmoceras " "'is a nautiloid cephalopod from the upper Caradocian of Estonia, assigned to the Tarphycerida.
24.
Discosorids are nautiloid cephalopods generally characterized by inflated siphuncle segments that expand into the chambers and by connecting rings that vary in composition along their length.
25.
An orthoconic form evolved several times among cephalopods, and among nautiloid cephalopods is prevalent among the ellesmerocerids, endocerids, actinocerids, orthoceratoids, and bactritids.
26.
""'Cyrtogomphoceras " "'is a nautiloid cephalopod, recognized by its large breviconic shell with a notable endogastric curvature.
27.
The "'Cymatoceratidae "'is a family of Mesozoic and early Cenozoic nautiloid cephalopods and the most abundant of this kind in the Cretaceous.
28.
""'Sinclairoceras " "'is a nautiloid cephalopod in the discosorid family Westonoceratidae from the Middle Ordovician Simard Limestone of Quebec.
29.
""'Kayoceras " "'is a middle Silurian nautiloid cephalopod, known from Iowa and Illinois, belonging to the Discosoridae.
30.
""'Danaoceras " "'is a nautiloid cephalopod from the middle Silurian of central Europe included in the oncoceroid family Polyelasmoceratidae.
