Aptychus of an Ammonite

Scale bar = 5cm

Description

Upper Jurassic, Oxford Clay
Christian Malford
Wiltshire
England
M2133
Description:

An aptychi (singular aptychus) is part of the jaw apparatus of an ammonite. In the past the interpreted function of this structure was controversial and some interpreted the aptychi as an operculum, a guard for closing the ammonites body aperture, this is no longer a common interpretation.
Moore, C.
Cosmoceras sp. ?

Classification

Mollusca
Visceroconcha
Cephalopoda
Ammonoidea
Ammonoidea order
Ammonoidea family
Aptychus
sp.