Troostoceras

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Troostoceras Temporal range: Middle Ordovician PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	†Actinocerida
Family:	†Actinoceratidae
Genus:	†Troostoceras Foeste & Teichert, 1930

Troostoceras is a genus of actinoceratid nautiloids with a cyrtoconic shell, otherwise similar to Actinoceras. The shell is slightly endogastric, curved such that the under or ventral side is longitudinally concave, tucked in. The siphuncle is ventral and is in contact with the shell wall. Segments begin small but expand during growth.

Troostoceras has been found in the Middle Ordovician of eastern North America and Siberia and may be a variety of Actinoceras, along with Saffordoceras and Leurorthoceras.