Kosmoceras jason
| Kosmoceras jason Temporal range: Callovian, 154–160 Ma | |
|---|---|
 | |
| Fossil of Kosmoceras jason from Mamers (France), on display at Galerie de paléontologie et d'anatomie comparée in Paris | |
| Scientific classification | |
| Kingdom: | Animalia |
| Class: | Cephalopoda |
| Subclass: | Ammonoidea |
| Order: | Ammonitida |
| Superfamily: | Stephanocerataceae |
| Family: | Kosmoceratidae |
| Genus: | Kosmoceras |
| Species: | K. jason |
| Binomial name | |
| Kosmoceras jason (Reinecke 1847) | |
Kosmoceras jason is an ammonite species from the Callovian (Middle Jurassic), lasting between 154 and 160 Ma. [1]
Description
Kosmoceras jason has a shell that reaches a size of about 10 cm. These ammonites have a very compressed section and a narrow umbilicus on phragmocone. Ornamentation is fine and dense.[1]
This species is characterized by sexual dimorphism, with macroconch (large shell) in females and microconch (small shell) in males. [2]
References
- 1 2 Ammonites
- ↑ Joe Shimmin An Introduction to Ammonites
External links
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