Ptenoceras – a cephalopod with markings

(ten-o-sarahs)

Fossil of the nautiloid cephalopod, Ptenoceras alatum.
Image: Jon Augier
Source: Museum Victoria

Devonian

HOW BIG IT WAS

Ptenoceras  relative size depiction as described below
Ptenoceras was about 8 cm high.

Ptenoceras was a nautiloid, a cephalopod related to modern-day nautiluses. The shell of Ptenoceras was loosely coiled, unlike the straight, conical shells of earlier nautiloids.

Ptenoceras is also one of the few extinct cephalopods where fossils have preserved clues about the markings on the shell; an examination of some fossilised Ptenoceras shells show that they had dark, banded markings on a pale background, similar to the markings seen on the shells of modern-day Nautilus.

A TRAIL THROUGH TIME

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

NautiloidsGoniatitesParalegocerasCladiscitesBelemnitesBostrychoceras

WHERE IT WAS FOUND

Ptenoceras map

This fossil of Ptenoceras alatum was discovered in the Czech Republic.

RELATED OBJECTS

Other objects from the Devonian

CalderasGogonasusTiktaalikAcanthostegaDicranurusDipleura