定制支架上的大型结晶菊石 - 骨骼化石 - Ammonoidea - 23 cm - 11 cm (没有保留价)

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 appeared during the Devonian, with the last species vanishing during or soon after the Cretaceous–Paleogene extinction event.
Ammonites are excellent index fossils, and linking the rock layer in which a particular species or genus is found to specific geologic time periods is often possible. Their fossil shells usually take the form of planispirals, although some helically spiraled and nonspiraled forms (known as heteromorphs) have been found.
The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns. Pliny the Elder (d. 79 AD near Pompeii) called fossils of these animals ammonis cornua ("horns of Ammon") because the Egyptian god Ammon (Amun) was typically depicted wearing rams' horns.[2] Often, the name of an ammonite genus ends in -ceras, which is from κέρας (kéras) meaning "horn".

A P P R O X I M A T E D I M E N S I O N S - including stand
Height: 23 cm
Width: 11 cm

DISCLAIMER
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> It's a natural product, small cracks or flaws can happen. Please refer to the pictures.
> THE WEIGHT MENTIONED IS INCLUDING STAND AND PACKING MATERIAL.
> Please be aware these pictures have been taken in a dark studio, colors may vary depending on the environment.

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