6.4" Perisphinctes Ammonite - Jurassic

This is a classic Late Jurassic ammonite fossil from Madagascar of the genus Perisphinctes. It's 6.4" wide and preserves the distinctive ridges of this type of ammonite. This specimen is missing the outer shell near the opening, showing some of the inner shell and sutures.

It comes with an acrylic display stand.

Ammonites were predatory mollusks that resembled a squid with a shell. These cephalopods had eyes, tentacles, and spiral shells. They are more closely related to a living octopus, though the shells resemble that of a nautilus. True ammonites appeared in the fossil record about 240 million years ago. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

Near Sakaraha, Madagascar
6.4" wide
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