AMMONITIDAAMMONITIDA
| Czechoslovakia 1968 |
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| Phylloceras Hypophyllocers bizonatum (Phylloceratina) |
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| Pachydiscus Pachydiscus (Pachydiscusdae) (AMMONITIDA) |
Heteromorph Ammonites Nipponites mirabilis (Nostoceratidae) (AMMONITIDA) |
Polyptychoceras Polyptychoceras (Diplomoceratidae) (AMMONITIDA) |
Ammonitida is one of Cephalopoda which is distributed over the ocean widely between about around 350,000,000 years until an end in the Cretaceous for the Mesozoic from last years in the Silurian in the Paleozoic era, and prospered. It is usual that all seeds have a shape of the conch which is flat with an existence husk. The kind that lived in each generation that is the low rank of the Paleozoic era and the Mesozoic is done with an index fossil by each, and it is for a geology study with extremely important creature group. It is thought that Ammonitida differentiated from nautiloid inhabiting from Ordovician period. Thereafter they prospered really by the long times, but disappeared last from the ground on the K-T border on an end of in curtain discount of the Mesozoic and the Cretaceous to be.
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