Polyptychoceras (Polyptychoceras) pseudogaultinum
Ammonoidea
[Beta] View Polyptychoceras sp. occurences on the world map.
Size at widest points: 64 mm.
The shell is made of a succession of straight parallel shafts. A given shaft can grow just enough to encompass the previous one or, like in the photographed specimen, it can get much longer than the previous one. The simple ribs are quite smooth on the early stage and get stronger when approaching the body chamber.
2000 . Fukuoka, K.
The pictorial of ammonites from Hokkaido - The Hokkaido Shimbun Press
p. 237
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Created by
Guillaume
on
02/01/2017 - 01:07:56
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