Asteroceras

Asteroceras ("star horn") is an extinct genus of cephalopod belonging to the Ammonite subclass. These fast-moving nektonic carnivores lived during the Triassic and Jurassic periods (from 205.6 to 189.6 Ma).^[1]

Asteroceras Temporal range: Late Triassic-Early Jurassic 205.6–189.6 Ma[1] PreꞒ Ꞓ O S D C P T J K Pg N
Asteroceras fossil from Dorset, England.
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Arietitidae
Subfamily:	†Asteroceratinae
Genus:	†Asteroceras Hyatt, 1867

Species

• Asteroceras blakei Spath, 1925
• Asteroceras confusum Spath, 1925
• Asteroceras obtusum (Sowerby, 1817)
• Asteroceras reynesi Fucini, 1903
• Asteroceras saltriensis Parona, 1896
• Asteroceras smithii (Sowerby, 1814)
• Asteroceras stellare (Sowerby 1815)
• Asteroceras turneri (Sowerby, 1814)

^[1][2]

Distribution

Asteroceras fossils may be found in the Jurassic marine strata of Canada, China, Germany, Hong Kong, Hungary, Peru, and Turkey, in the Triassic of United States and at Lyme Regis in the Asteroceras obtusum zone of Upper Sinemurian age.^[3][1]