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  • Ammonoids Are A Group Of Extinct Marine Mollusc Animals In The Subclass Ammonoidea Of The Class Cephalopoda.
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda.

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  • Photo title: Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda.
  • Author: Ralukatudor
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  • Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids octopuses, squid, and cuttlefish than they are to shelled nautiloids such as the living Nautilus species. Ammonites are excellent index fossils, and it is often possible to link the rock layer in which a particular species or genus is found to specific geologic time periods. Their fossil shells usually take the form of planispirals, although there were some helically spiraled and nonspiraled forms.
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amazing ammonites ammonoidea ammonoids ancient animals cephalopoda chambers class closely coleoids commonly creature cuttlefish dividing excellent extinct form forms fossil fossilized fossils found general genus geologic group helically index joint jurassic layer link living marine mollusc molluscs more nature nautiloids nautilus nonspiraled octopuses old oldest outer particular period periods phragmocone planispirals possible referred related rock separate septa shape shell shelled shells siphuncles some species specific spiral spiraled squid subclass sutures take time usually wall walls

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Ammonoids are an extinct group of marine mollusc animals Fossil ammonite on white background Fossil ammonite on white background Fossil of an ammonoids Ammonite Nautilus Fossil Shell Sliced Open Ammonite Nautilus Fossil Shell Sliced Open
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. Specimen of Gravesia gigas ammonite Ammonoids fossils background, group marine mollusc animals ammonites, is found to specific geologic time periods Ammonoids fossils background, group marine mollusc animals ammonites, is found to specific geologic time periods Ammonoids fossils background, group marine mollusc animals ammonites, is found to specific geologic time periods
 
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  • Ammonoids Are A Group Of Extinct Marine Mollusc Animals In The Subclass Ammonoidea Of The Class Cephalopoda.
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