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


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