Tithonoceras
Encyclopedia
Tithonoceras is a genus of nautiloid cephalopod from the Upper Jurassic
(Thithonian stage) found in the Crimea, belonging to the nautilacean
family Paracenoceratidae.
The shell of Tithonoceras is evolute, coiled with all whorls exposed, smooth, and laterally compressed. The whorl section is subquadrangular with a broad, flattened venter on the outer rim. Ventrolateral shoulders are inflated, forming broad, rounded, keels, bordered by broadly furrows on the flanks. The suture is sinuous, with ventral and lateral lobes. The position of the siphuncle is unknown.
Jurassic
The Jurassic is a geologic period and system that extends from about Mya to Mya, that is, from the end of the Triassic to the beginning of the Cretaceous. The Jurassic constitutes the middle period of the Mesozoic era, also known as the age of reptiles. The start of the period is marked by...
(Thithonian stage) found in the Crimea, belonging to the nautilacean
Nautilaceae
The Nautilaceae is one of five superfamilies that make up the Nautilida according to Bernard Kummel , and the only one that survived past the Triassic. The Nautilaceae comprise six families: Nautilidae, Paracenoceratidae, Pseudonautilidae, Cymatoceratidae, Hercoglossidae, and Aturiidae...
family Paracenoceratidae.
The shell of Tithonoceras is evolute, coiled with all whorls exposed, smooth, and laterally compressed. The whorl section is subquadrangular with a broad, flattened venter on the outer rim. Ventrolateral shoulders are inflated, forming broad, rounded, keels, bordered by broadly furrows on the flanks. The suture is sinuous, with ventral and lateral lobes. The position of the siphuncle is unknown.