Craspedites

Craspedites
Temporal range: Berriasian[1]
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Superfamily: Perisphinctoidea
Family: Craspeditidae
Genus: Craspedites
A. Pavlow, 1892

Craspedites is a ammonoid cephalopod included in the Perisphinctaceae that lived during the Late Jurassic and Early Cretaceous, found in Canada, Greenland, Poland, and the Russian Federation.

Diagnosis and range

Craspedites, described by Aleksei Petrovich Pavlow in 1892, is characterized by a small, up to about 5 cm in diameter, smooth, essentially involute shell with simple ammonitic sutures. Whorl section is rounded, venter smooth; umbilicus small, exposing the dorsal portion of the inner whorls. Main sutural elements, primary saddles and lobes, are modified by small secondaries.

Craspedites was thought to be restricted to the Upper Jurassic Tithonian until discovery of a new species, C. sachsi, described from the Berriasian age of Russia by A. E. Igolnikov in 2012, named in honour of paleontologist V.N. Sachs.[2]

Species

  • C. canadensis Jeletzky, 1966
  • C. ivanovi Gerasimov,
  • C. jugensis Prigorovsky, 1906
  • C. kaschpuricus
  • C. mosquensis Gerasimov, 1960
  • C. nodiger Eichwald, 1868
  • C. planus
  • C. praeokensis Rogov, 2017
  • C. pseudofragilis Gerasimov, 1960
  • C. sachsi Igolnikov, 2012[3]
  • C. shulginae Alifirov, 2009
  • C. singularis
  • C. taimyrensis
  • C. transitionis Rogov, 2017
  • C. unshensis

References

  1. ↑ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
  2. ↑ A. E. Igolnikov (2012). "Craspedites (Vitaliites?) sachsi, a New Boreal Berriasian ammonite species of the North of Eastern Siberia (Nordvik Peninsula)" (PDF). Paleontological Journal. 46 (1): 12–15. doi:10.1134/S0031030112010066. Archived from the original (PDF) on 2013-10-17.
  3. ↑ "Paleobiology Database - Craspedites". Retrieved 2014-05-28.
  • Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.