From Wikipedia, the free encyclopedia
Jump to: navigation, search
Temporal range: Ordovician
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Orthocerida
Family: Stereoplasmoceratidae
Kobayashi (1934)

Stereoplasmoceratidae is an extinct family of actively mobile aquatic carnivorous cephalopods belonging to the subclass Nautiloidea endemic to what would be Asia during the Ordovician living from 490—457.5 mya, existing for approximately 32.5 million years.[1]


An image showing the siphuncle, the tube which connects the current living shell to the previous ones.

Stereoplasmoceratidae was named by Kobayashi (1934). It was assigned to Pseudorthocerataceae by Teichert et al. (1964).[2]

See also[edit]


  1. ^ PaleoBiology Database: Stereoplasmoceratidae, basic info
  2. ^ C. Teichert, B. Kummel, W.C. Sweet, H.B. Stenzel, W.M. Furnish, B.F. Glenister, H.K. Erben, R.C. Moore, and D.E. Nodine Zeller. 1964. Cephalopoda - general features - Endoceratoidea - Actinoceratoidea - Nautiloidea - Bactritoidea. Treatise on Invertebrate Paleontology K(3):1-519