Craspedites is an ammonoid cephalopod included in the Perisphinctoidea that lived during the Late Jurassic and Early Cretaceous, found in Canada, Greenland, Poland, and the Russian Federation.
| Craspedites Temporal range:
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Craspeditidae |
| Genus: | †Craspedites A. Pavlow, 1892 |
Diagnosis and range
editCraspedites, 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
edit- C. canadensis Jeletzky, 1966
- C. ivanovi Gerasimov, 1960
- 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
edit- ^ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
- ^ 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.
- ^ "Paleobiology Database - Craspedites". Retrieved 17 December 2021.
Further reading
edit- 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.
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