Psiloceras

Psiloceras; Temporal range: Hettangian PreꞒ Ꞓ O S D C P T J K Pg N ↓
	Psiloceras laevis
Scientific classification
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;

Phylum:Mollusca

Class:Cephalopoda

Subclass:†Ammonoidea

Order:†Ammonitida

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]

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Psiloceras

Biostratigraphic significance

Distribution

References

Related Articles

Psiloceras Temporal range: Hettangian^[1] PreꞒ Ꞓ O S D C P T J K Pg N ↓

Psiloceras laevis
Scientific classification
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