Brevicoceratidae

Brevicoceratidae
Temporal range: Ludlow–Devonian
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Oncocerida
Family: Brevicoceratidae
Flower, 1941

The Brevicoceratidae, named by Flower in 1941, is a family of oncocerids that contains genera characterized by exogastric (or rarely endogastric) gyrocones, brevicones, and torticones.[1][2] that tend to develop vestigial actinosiphonate deposits and subtriangular transverse sections. The Brevicoceratidae are derived from Oonoceras (Oncoceratidae) and range from the mid-Silurian to the Upper Devonian.[2]

Brevicoceratidae is named for the Middle Devonian genus, Brevicoceras, from North America.[2] All told there are some 17 named genera. The family begins with Oxygonioceras in the Middle Silurian,[2] sole recognized representative of that time, and reaches its greatest diversity with 12 genera in the Middle Devonian.[2] The Brevicoceratidae are reduced to four genera in the Upper Devonian, when they become extinct.

See also

References

  1. ↑ Flower, Rousseau H.; Kummel, Bernhard (1950). "Flower & Kümmel; a Classification of the Nautiloidea". Journal of Paleontology. 24 (5): 604–616. JSTOR 1299547.
  2. 1 2 3 4 5 Sweet, W. C. (1964). "Nautiloidea-Oncocerida". Nautiloidea. Treatise on Invertebrate Paleontology. K. Geological Society of America and University of Kansas Press.
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