Bostrychoceras – a turret-shaped ammonite

(bos-trick-o-sarahs)

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Model of Bostrychoceras
Image: Jon Augier
Source: Museum Victoria

Fossil of Bostrychoceras polyplocum.
Image: Jon Augier
Source: Museum Victoria

Cretaceous

HOW BIG IT WAS

Bostrychoceras relative size depiction as described below
This fossil is approximately 25 cm long.

At the end of the Cretaceous Period, it was not only dinosaurs and pterosaurs that disappeared. Sea life also suffered, and cephalopods like this ammonite became extinct.

Most ammonites had a spiral-shaped shell, however some Cretaceous ammonites showed some interesting variations in shell form. The shell of Bostrychoceras was helical, and had an almost turret-like shape. Other Cretaceous ammonites showed even more unusual shell forms. This diversity came to an abrupt end at the mass extinction event at the end of the Cretaceous.

A TRAIL THROUGH TIME

Cephalopods first appeared in the Silurian and survive to this day. See how this group has changed over time.

NautiloidsPtenoceras GoniatitesParalegocerasCladiscitesBelemnites

WHERE IT WAS FOUND

Bostrychoceras map

This fossil of Bostrychoceras was discovered in Germany.

RELATED OBJECTS

Other objects from the Cretaceous

PlatypterygiusMuttaburrasaurusKoolasuchusBishopsBlack coalQantassaurus