| Species | Ammonites Perisphinctes sp. |
|
Geological Period
|
Late Jurassic ≈ 163-141 Ma |
| Origin | Tulear , Madagascar |
| Size |
Small: 3.0 - 4.0cm Medium: 4.0 - 5.0 cm Large: 5.0 - 6.0 cm |
This species is characterized by having thin, prominent and profuse dorsal ribs, while the thin ventral ribs branch towards the belly.
Ammonites were a group of cephalopods with a spiral shell, which thrived in the Mesozoic oceans, and abruptly became extinct along with the dinosaurs.
Its collective name refers to its resemblance to the spiral horns of a ram, with which the Egyptian god of Amun was represented in its Roman adaptation (Jupiter-Amun).
The group, numbering about 10,000 species, disappeared 65 million years ago, providing uncompromising support for biological evolution and evidence of our planet's changing biodiversity.
Deposits: Antarctica, Argentina, Cuba, Ethiopia, France, India, Iran, Italy, Madagascar, Poland, Portugal, United Kingdom, Russia, Saudi Arabia, Spain and Yemen.
The piece you receive may differ slightly from the photo shown, since the fossils are natural and there is no identical piece. The size is approximate.