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Acleistoceratidae

From Wikipedia, the free encyclopedia

Acleistoceratidae
Temporal range: MSilurian- MDevonian
Amphicyrtoceras pettiti
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: †Oncocerida
Family: †Acleistoceratidae
Flower in Flower & Kümmel 1950

The Acleistoceratidae is a family of oncocerids that contains genera characterized by depressed (or rarely compressed) exogastric brevicones and cyrtocones (Sweet, 1964 K398) that range from the Middle Silurian to the Middle Devonian. The siphuncle is broadly expanded, and in some actinosiphonate.

The Acleistoceratidae are derived from Oncoceras (Oncoceratidae) through Amphycertoceras, independently of the Oonoceras stock. The family is named for the genus Acleistoceras. All told some 22 genera have been described.

References

  • Flower,R.H. 1950; Flower & Kümmel; A Classification of the Nautiloidea; Journal of Paleontology, Vol 24, no 5, pp604–610, Sept 1950
  • Sweet, W.C. 1964; Nautiloidea-Oncocerida, in the Treatise on Invertebrate Paleontology, Part K Nautiloidea, Geological Society of America and University of Kansas Press.
This page was last edited on 18 July 2023, at 19:13
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