Tornoceratina

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TornoceratinaTemporal range:
The prionoceratid Imitoceras rotatorium. Early Carboniferous, Rockford Limestone, Rockford, Illinois.
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Goniatitida
Suborder:	†TornoceratinaWedekind, 1914
Dimeroceratoidea
Karagandoceratoidea
Praeglyphioceratoidea
Prionoceratoidea
Pseudohaloritoidea
Tornoceratoidea

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Tornoceratina 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.

• 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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