- Cleistosphinctes
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Cleistosphinctes
Temporal range: MJurassic[1]Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Ammonitida Superfamily: Perisphinctaceae Family: Perisphinctidae Genus: Cleistosphinctes Cleistosphinctes is an extinct cephalopod genus from the ammonite order that lived during the Middle Jurassic approximately 174 to 170 million years ago.
Cleistosphinctes, named by Arkell, 1953, and included in the family Perisphinctidae and superfamily Perisphinctaceae, is small, compressed, evolute, with long secondary ribs and very large asymmetric spatulate lappets that embrace the sides of the preceding whorl.
See also
References
- ^ Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology 364: 560. http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=231&rank=class. Retrieved 2008-04-05.
- Treatise on Invertebrate Paleontology, Part L Ammonoidea; Geological Society of America and Univ of Kansas press, 5th printing, 1990. (p. L314)
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