Anotoceras
Encyclopedia
Anotoceras is a smooth shelled, discoidal ammonite with a depressed, subtrigonal whorl section and ceratitic sutures included in the ceratitid
family Otoceratidae
.
Anotoceras comes from the Lower Triassic
of the Himalaya
Ceratitida
The Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Permian, the exception being the phylloceratids which gave rise to the great diversity of post Triassic ammonites....
family Otoceratidae
Otoceratidae
Otoceratidae is an extinct family of cephalopods belonging to the Ammonite subclass in the order Ceratitida.-References:* Accessed on 9/24/07...
.
Anotoceras comes from the Lower Triassic
Triassic
The Triassic is a geologic period and system that extends from about 250 to 200 Mya . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events...
of the Himalaya
References
- Arkell et al, Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L. Geol Soc of America and Univ Kansas press, 1957. R. C. Moore (ed)