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Protanisoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Turrilitaceae
Family:
Anisoceratidae
Formal Genus Name and Reference:
Protanisoceras SPATH, 1923a, p. 75
Type Species:
Hamites raulinianus ORBIGNY, 1842a, p. 546, OD
Images
(Click to enlarge in a new window)
F IG . 184,2a–c. *P. (P.) raulinianum (O RBIGNY), Lower Albian, France; a,b, × 1 (Orbigny, 1840–1842); c, × 2 (Casey, 1961a).
Synonyms
Geographic Distribution
western and central Europe, Madagascar, India, Peru
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (?Upper Aptian, Lower Albian)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
66
Beginning Date:
115.99
Ending Stage in Treatise Usage:
Lower Cretaceous (Middle Albian)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
50
Ending Date:
106.85
Description
Coiled in open spiral, in one plane or slightly helicoid, with terminal hook or with several more or less straight shafts, ribs rectiradiate, weak or absent on dorsum, with ventrolateral and in some species midlateral tubercles on some or all ribs, ribs joining tubercles across venter may be flattened but not doubled, in later species tubercles may be septispinate. Suture rather simple with bifid saddles, subtrifid or bifid L, and small trifid U. [P. cuerdai WIEDMANN, 1962b, p. 106, Upper Aptian, Spain, with bifid L, known only in small fragments, probably belongs here.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Turrilitaceae
Family:
Anisoceratidae
Formal Genus Name and Reference:
Protanisoceras SPATH, 1923a, p. 75
Type Species:
Hamites raulinianus ORBIGNY, 1842a, p. 546, OD
Images
(Click to enlarge in a new window)
F IG . 184,2a–c. *P. (P.) raulinianum (O RBIGNY), Lower Albian, France; a,b, × 1 (Orbigny, 1840–1842); c, × 2 (Casey, 1961a).
Synonyms
Geographic Distribution
western and central Europe, Madagascar, India, Peru
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (?Upper Aptian, Lower Albian)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
66
Beginning Date:
115.99
Ending Stage in Treatise Usage:
Lower Cretaceous (Middle Albian)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
50
Ending Date:
106.85
Description
Coiled in open spiral, in one plane or slightly helicoid, with terminal hook or with several more or less straight shafts, ribs rectiradiate, weak or absent on dorsum, with ventrolateral and in some species midlateral tubercles on some or all ribs, ribs joining tubercles across venter may be flattened but not doubled, in later species tubercles may be septispinate. Suture rather simple with bifid saddles, subtrifid or bifid L, and small trifid U. [P. cuerdai WIEDMANN, 1962b, p. 106, Upper Aptian, Spain, with bifid L, known only in small fragments, probably belongs here.]