Transicoeloceras
Genus of molluscs (fossil)
From Wikipedia, the free encyclopedia
Transicoeloceras, which is sometimes considered to be a synonym of Catacoeloceras[2] is genus of ammonite that lived during Toarcian stage (Bifrons to lower Gradatus ammonite Zones) of early Jurassic. Their fossils were found in Hungary, Italy, France, southern Spain and South America. It has evolved from Mesodactylites.[1]
| Transicoeloceras Temporal range: [1] | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Dactylioceratidae |
| Subfamily: | †Nodicoeloceratinae |
| Genus: | †Transicoeloceras Pinna, 1966 |
| Type species | |
| Transicoeloceras angustum Pinna, 1966 | |
| Species | |
| |
Description
Ammonites belonging to this genus have small shells. Coiling is involute to sphaerocone. Rounded subtrapezoid whorl section has maximum width at the shoulder. Umbilicus is deep and venter is broad and convex. Fine ribs were simple, or bifurcating and also had tubercules.[1]
