Oncocerida

Oncocerida
Temporal range: Middle Ordovician–Lower Carboniferous
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Oncocerida
Flower, 1950

The Oncocerida comprise a diverse group of generally small nautiloid cephalopods known from the Middle Ordovician to the Mississippian (early Carboniferous; one possible member is known from the Early Permian[1]), in which the connecting rings are thin and siphuncle segments are variably expanded (Flower, 1950). At present the order consists of some 16 families, a few of which, such as the Oncoceratidae, Brevicoceratidae, and Acleistoceratidae contain a fair number of genera each while others like the Trimeroceratidae and Archiacoceratidae are represented by only two or three (Sweet, 1964).

Life reconstruction of Cyrtoceras sp
  1. ^ T. B. Leonova; A. Yu. Shchedukhin (2020). "Asselian-Sakmarian nautiloids of the Shakh-Tau reef (Bashkortostan)". Paleontological Journal. 54 (10): 1113–1134. doi:10.1134/S0031030120100044.