Arkelloceras

Arkelloceras Temporal range: Bajocian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ammonitida
Suborder:	Ammonitina
Superfamily:	Stephanoceratoidea
Family:	Otoitidae
Genus:	Arkelloceras

Arkelloceras is an early Middle Jurassic (Bajocian stage) Stephanoceratoid (Ammonitina) genus from arctic Canada, Alaska, and Siberia belonging to the family Otoitidae (Imlay 1984, Westermann 1965)

Arkelloceras seems to be a direct descendant of Abbasites and is thought to have given rise to Ermoceras and possibly to Thamboceras. (Westermann 1965)

References

• Imlay, Ralph W. 1984. Early and Middle Bajocian (Middle Jurassic) Ammonites from Southern Alaska;U.S.G.S PP 1322 [1]
• Westermann, G. E. G. 1965.Septal and Sutural Patterns in Evolution and Taxonomy of Thamboceratidae and Clydoniceratidae (M Jurassic Ammonitina). Jour of Paleontology 39(5)864-874, Sept.