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Psiloceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Psilocerataceae
Family:
Psiloceratidae
Formal Genus Name and Reference:
Psiloceras HYATT, 1867
Type Species:
Am. planorbis Sowerby, 1824, SD SPATH, 1924 (ICZN Opinion 324)
Images
(Click to enlarge in a new window)
Fig. 258,10. *P. (P.) planorbis (Sow.), Eng., 10a, holotype, x0.7 (18*), 10b,c, drawings, x1 (737*)
Synonyms
Psilonoticeras
Geographic Distribution
Eu.-Indon.-N.Z.-Can.-Nev.-Peru.
Age Range
Beginning Stage in Treatise Usage:
L.Jur.(Hett.)
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
L.Jur.(Hett.)
Ending International Stage:
Hettangian
Fraction Up In Ending Stage:
100
Ending Date:
199.46
Description
Small, compressed planulates, smooth, unribbed or with sporadic blunt rib
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Psilocerataceae
Family:
Psiloceratidae
Formal Genus Name and Reference:
Psiloceras HYATT, 1867
Type Species:
Am. planorbis Sowerby, 1824, SD SPATH, 1924 (ICZN Opinion 324)
Images
(Click to enlarge in a new window)
Fig. 258,10. *P. (P.) planorbis (Sow.), Eng., 10a, holotype, x0.7 (18*), 10b,c, drawings, x1 (737*)
Synonyms
Psilonoticeras
Geographic Distribution
Eu.-Indon.-N.Z.-Can.-Nev.-Peru.
Age Range
Beginning Stage in Treatise Usage:
L.Jur.(Hett.)
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
L.Jur.(Hett.)
Ending International Stage:
Hettangian
Fraction Up In Ending Stage:
100
Ending Date:
199.46
Description
Small, compressed planulates, smooth, unribbed or with sporadic blunt rib