The shell is involute, subglobular, with a deep umbilicus and flattened flanks that slope toward a more narrowly rounded venter, and covered by low, widely spaced ribs.
12.
The shell of " Arcestes " is globular or subglobular with periodic narrow transverse constrictions in internal molds due to periodic internal transverse ridges ( variaces ) in the shell.
13.
The shell, as described for the type, " Paratornoceras ", is subglobular and evolute on young stages, but discoidal and with closed umbilicus in the adult.
14.
Prolobitidae is divided into two subfamilies, Prolobitinae consisting of subglobular to subdiscoidal shells with moderate to closed umbilici, and Raymondoceratinae consisting of discodal shells with tramsverse ribs and large umbilici.
15.
The shell of " Yinoceras " is involute, small to intermediate in size, subglobular or thickly discoidal with a very small umbilicus, convex flanks, and rounded venter.
16.
"' Bisatoceratidae "'is a family of Late Paleozoic ammonites now included in the Thalassoceratoidea characterized by thick-discoidal to subglobular, involute shells in which lobes are simple.
17.
The Pseudohaloritide which now contains some 14 genera in three subfamilies is characterized by small, subdiscoidal to subglobular, involute shells, the surface of which may be smooth or with coarse longitudinal lirae and / or transverse ribs.
18.
"Eutrephoceras " is generally subglobular, broadly rounded laterally and ventrally, with a small to occluded umbilicus, broadly rounded hyponomic sinus, only slightly sinuous sutures, and a small siphuncle that is variable in position.
19.
The Ptychitidae, to which " Arctoptychites " belongs, is a family of ceratitid ammonites ( " sensu lato " ) with ammonitic sutures and variably subglobular to compressed, ribbed or smooth, generally evolute shells.
20.
The "'Ptychitacheae "'is a superfamily of typically involute, subglobular to discoidal Ceratitida in which the shell is smooth with lateral folds or strigations, inner whorls are globose, and the suture is commonly ammonitic.
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