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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Cephalopoda
Subclassis: † Ammonoidea
Ordo: Goniatitida
Subordo: Tornoceratatina
Superfamiliae: Dimerocerataceae - Prionocerataceae - Pseudohaloritaceae - Tornocerataceae
Name

Tornoceratatina Wedekind, 1914
References

The Paleobiology Database Accessed 10/8/07

Vernacular names
English: Tornoceratatina

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.
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

Mollusca Images

Biology Encyclopedia

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