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Ammonite - Ammonoidea -
Ammonite #1
Ammonite is generally known as an index fossil of the Mesozoic era. But the subclass Ammonoidea already appeared in the Devonian period of the Paleozoic era 1).
Ammonite #2
Ammonites are resemble to the extant marine mollusc of the cephalopod subclass Nautiloidea (e.g. nautilus), but the ammonites are a group of the subclass Ammonoidea in the class Cephalopoda, and are more closely related to the subclass Coleoidea (e.g. octopuses, squids, cuttlefishes) 1).
Ammonite #3
The suture pattern of ammonoids which is seen radially on the shell is used for identification of the species 1).
Ammonite #5
The anatomical informations about the soft parts of Ammonite are little. So, this needle felted ammonite was reconstructed referring to the living nautiluses, squids or octopuses, and also Fig.14 of Mironenko(2015) 2). Nautilus has a hood (head sheild), but Ammonite lacks it 3).
Ammnote #4
created in November 2016.