Uranoceratidae

The Uranoceratidae is a family of Silurian barrandeoceroids that tend to become uncoiled with age and in which siphuncle segments tend to be expanded into the camerae.[1]

Uranoceratidae
Temporal range: ?Late Ord - Mid Sil
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: †Tarphycerida
Suborder: †Barrandeocerina
Family: †Uranoceratidae
Hyatt in Zittel, 1900
Genera

See text

Description

Shells of uranoceratids are gyroconic. Early stages of a few species are annulated. Later stages of all are smooth or faintly striated or cancellated.[2] In many, septal necks are straight, but in others recumbent on one side or the other. Connecting rings are thin.

Derivation and content

The Uranoceratidae are derived from Bickmorites.[1] Genera include:

gollark: Could be a SAlt, if they did not have ridiculous constraints.
gollark: > get chrono> ask birdz nicely> convert blue to pink> ???> profit
gollark: Weird.https://dragcave.net/locations/0 actually loops you round to the homepage.
gollark: https://dragcave.net/locations/secret/prize-owners
gollark: <@!282594912682115074> Bring back the omenic messengers! Ask for a fully pink omen too!

References
  1. Flower, R.H. & Kummel, B. 1950. A Classification of the Nautiloidea. Journal of Paleontology vol 24, no.5, pp604–616, Sept 1950.
  2. Sweet, Walter C, 1964. Nautiloidea - Barrandeocerida, in Treatise on Invertebrate Paleontology, Part K, Geol Soc of America, Teichert & Moore(eds).
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.