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令人惊叹的天然化石 - 动物化石 - Crinoid - 19 cm - 13 cm
编号 78776413
编号 78776413
An excellent example of a rare Australian uncoiled (heteromorph) ammonite.
The specimen retains much of it’s calcite exoskeleton.
Such ammonites are perhaps one of the most aesthetically pleasing of all cephalopods.
While most ammonites have spiral shells that retain the same shape throughout growth (homomorph), the major group of Ancyloceratina, that appeared during the Late Jurassic had these uncoiled shells instead, and were called heteromorph ammonites (meaning, different-shaped).
Ammonite is 4,2 cm large
Tonohamites (toxaceratoides) taloryi (ETHERIDGE, 1892)
Aptian
Wallumbilla Fmt
Walsh River- Queensland, Australia
Fantastic specimen, a "must piece" for all the Ammonite Lovers.