Psiloceras

Psiloceras; Temporal range:
	Psiloceras laevis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Psiloceratidae
Genus:	†Psiloceras; Hyatt, 1867
Species
	P. planorbis (Sowerby, 1824) (type) synonym Ammonites planorbis, A. sampsoni, P. sampsoni; P. becki; P. brevicellatum; P. calliphylloides; P. calliphyllum Neumayr, 1879 synonym Aegoceras calliphyllum; P. costosum; P. distinctum; P. erugatum; P. hagenowi; P. marcouxi Guex, Taylor, Rakus & Bucher, 1998; P. minillaensis von Hillebrandt, 2000; P. naumanni; P. pacificum Guex, 1980; P. polymorphum Guex, 1980; P. plicatulum (Quenstedt, 1883) synonym Ammonites plicatulus; P. primocostatum von Hillebrandt, 2000; P. psilonotum; P. sampsoni; P. spelae Guex, Taylor, Rakus & Bucher, 1998; P. spelae tirolicum von Hillebrandt & Krystyn, 2009; P. tenerum; P. tibeticum Yin et al., 2007; P. tilmanni Lange, 1925;

Psiloceras is an extinct genus of ammonite. Psiloceras is among the earliest known Jurassic ammonites, and the appearance of the earliest Psiloceras species form the definition for the base of the Jurassic. Unlike most earlier ammonites, which had complex shell shapes and ornamentation, Psiloceras had a smooth shell.^[3]^[4]

^ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28. {{cite journal}}: Cite journal requires |journal= (help)
^ Paleobiology Database - Psiloceras. 2014-05-29.
^ "Psiloceras pacificum". New Mexico Museum of Natural History and Science. Spring 2008. Archived from the original on 10 May 2015. Retrieved 5 August 2013.
^ Howarth, Michael K. (2013). "Chapter 4: Psiloceratoidea, Eodoceratoidea, Hildoceratoidea.". In Selden, Paul A. (ed.). Treatise Online, Part L (Revised) Mollusca 4, vol. 3B, Triassic and Jurassic Ammonoidea. Lawrence, Kansas: Paleontological Institute, University of Kansas. doi:10.17161/to.v0i0.4441.

[Sepkoski_Ceph-1] Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28. {{cite journal}}: Cite journal requires |journal= (help)

[paleodb-2] Paleobiology Database - Psiloceras. 2014-05-29.

[NMMNHS-3] "Psiloceras pacificum". New Mexico Museum of Natural History and Science. Spring 2008. Archived from the original on 10 May 2015. Retrieved 5 August 2013.

[4] Howarth, Michael K. (2013). "Chapter 4: Psiloceratoidea, Eodoceratoidea, Hildoceratoidea.". In Selden, Paul A. (ed.). Treatise Online, Part L (Revised) Mollusca 4, vol. 3B, Triassic and Jurassic Ammonoidea. Lawrence, Kansas: Paleontological Institute, University of Kansas. doi:10.17161/to.v0i0.4441.

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Psiloceras Temporal range:

Psiloceras laevis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Psiloceratidae
Genus:	†Psiloceras Hyatt, 1867
Species^[2]
P. planorbis (Sowerby, 1824) (type) synonym Ammonites planorbis, A. sampsoni, P. sampsoni P. becki P. brevicellatum P. calliphylloides P. calliphyllum Neumayr, 1879 synonym Aegoceras calliphyllum P. costosum P. distinctum P. erugatum P. hagenowi P. marcouxi Guex, Taylor, Rakus & Bucher, 1998 P. minillaensis von Hillebrandt, 2000 P. naumanni P. pacificum Guex, 1980 P. polymorphum Guex, 1980 P. plicatulum (Quenstedt, 1883) synonym Ammonites plicatulus P. primocostatum von Hillebrandt, 2000 P. psilonotum P. sampsoni P. spelae Guex, Taylor, Rakus & Bucher, 1998 P. spelae tirolicum von Hillebrandt & Krystyn, 2009 P. tenerum P. tibeticum Yin et al., 2007 P. tilmanni Lange, 1925