Tornoceratina

Tornoceratina; Temporal range: Middle Devonian - Middle Permian
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Goniatitida
Suborder:	†Tornoceratina; Wedekind, 1914
Superfamilies
	Dimeroceratoidea; Karagandoceratoidea; Praeglyphioceratoidea; Prionoceratoidea; Pseudohaloritoidea; Tornoceratoidea;

Tornoceratatina is one of two suborders included in the Goniatitida, characterized by generally involute, subdiscoidal shells and by sutures in which the ventral ones are undivided.

Sutural lobes increase in number during the course of life of the individual, typically developed from the internal and external saddles. The siphuncle is prochoanitic, with septal necks projecting forward.

Derivation is from the Anarcestida in the middle Devonian.

References

Miller, Furnish, and Schindewolf, 1957. Paleozoic Ammonoidea. Treastise on Invertebrate Paleontology, Part L. Geological Society of America.
Tornoceratina in Goniat on line, Mar. 5, 2015
The Paleobiology Database Oct.1, 2007

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