Amonita acanalada bien detallada - Stephanoceras - 115×95×40 mm

Amonita acanalada bien detallada - Stephanoceras - 115×95×40 mm
Jurásico (145.0-201,3 millones de años) - Madagascar

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 (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species.The earliest ammonites appear during the Devonian, and the last species vanished in the Cretaceous–Paleogene extinction event.

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 (known as heteromorphs).

Detalles del lote
Amonita acanalada bien detallada
Nombre científico
Periodo geológico
Jurásico (145.0-201,3 millones de años)
En buen estado
Pulido a mano
115×95×40 mm
403 g
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