Ammonite - Amonita translúcida - 105×85×25 mm

Descripción
Ammonite - Amonita translúcida - 105×85×25 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 mollusks, 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.[1] 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
Espécimen
Ammonite
Objeto
Amonita translúcida
Origen
Madagascar
Periodo geológico
Jurásico (145.0-201,3 millones de años)
Estado
En buen estado
Dimensiones
105×85×25 mm
Peso
221 g
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