''Shuranoceras'' is a genus in the extinct
oncocerid family Karoceratidae that plied the shallow sea floor from the
Early Silurian to the Early
Devonian
The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe ...
. ''Shuranoceras'' is characterized by a smooth, compressed, slowly enlarging orthoconic shell with a ventral submarginal
siphuncle
The siphuncle is a strand of tissue passing longitudinally through the shell of a cephalopod mollusk. Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the living nautiluses, cuttlefish, and ...
composed of complex segments. ''Shuranoceras'' was found in middle Silurian strata in Ferghana, central Asia.
Oncocerids (Order Oncocerida) were
nautiloid cephalopods that lived during the early part of the
Paleozoic
The Paleozoic (or Palaeozoic) Era is the earliest of three geologic eras of the Phanerozoic Eon.
The name ''Paleozoic'' ( ;) was coined by the British geologist Adam Sedgwick in 1838
by combining the Greek words ''palaiós'' (, "old") and ' ...
Era. They are closely related to the
Nautilids that include the living ''
Nautilus'', but on a different evolutionary branch.
See also
*
Nautiloid
**
List of nautiloids
This list of nautiloids is a comprehensive listing of all genera that have ever been included in the subclass Nautiloidea, excluding purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered in ...
References
* Sweet, W.C. 1964; Nautiloidea—Oncocerida, in the
Treatise on Invertebrate Paleontology
The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ...
; Geological Society of America and University of Kansas press.
* Sepkoski, J.J. Jr. 2002. A compendium of fossil marine animal genera. D.J. Jablonski & M.L. Foote (eds.). ''Bulletins of American Paleontology'' 363: 1–560
Sepkoski's Online Genus Database (CEPHALOPODA)
Prehistoric nautiloid genera
Oncocerida
{{paleo-Nautiloidea-stub