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Morphological comparisons between Nautiloids and Ammonites

rename
wastedshadows's version from 2016-01-23 16:08

Section

Nautiloids
Simple sutures
Thick siphuncle in the centre of the whorl
Concave septa towards the body chamber
Generally thicker shell wall

 

Ammonite
Complex sutures
Thin siphuncle on outer region of whorl
Septa convex towards body chamber
Shell generally quite thin