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Subthurmannia
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Neocomitidae
Formal Genus Name and Reference:
Subthurmannia SPATH, 1939a, p. 48
Type Species:
S. fermori, OD
Images
(Click to enlarge in a new window)
Fig. 40, 3a, b. *S. fermori, ?Berriasian, Pakistan, X0.3 (Spath, 1939a), FIG. 40, 3c, d. S. gallica (Mazenot), Lower Berriasian, France, X1 (Mazenot, 1939)
Synonyms
Subthurmanniceras, Tirnovella, Fauriella, Strambergella, Pseudoneocomites
Geographic Distribution
southern Europe, Pakistan, Peru
Age Range
Beginning Stage in Treatise Usage:
Upper Jurassic (Upper Tithonian)
Beginning International Stage:
Tithonian
Fraction Up In Beginning Stage:
70
Beginning Date:
144.94
Ending Stage in Treatise Usage:
Lower Cretaceous (Lower Valanginian)
Ending International Stage:
Valanginian
Fraction Up In Ending Stage:
45
Ending Date:
135.41
Description
Rather evolute, compressed, with gently convex sides; early whorls with flat venter and with ribs single or in pairs at umbilical margin, the branching point raised in a slight bulla, and with most ribs branching again at outer third of side; later whorls with rounded venter, with or without smooth band or shallow groove, in some with primary ribs becoming coarse and distant. [Separation as Tirnovella of slightly more involute, higher-whorled species with tendency of ornament to weaken on body chamber seems unnecessary.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Neocomitidae
Formal Genus Name and Reference:
Subthurmannia SPATH, 1939a, p. 48
Type Species:
S. fermori, OD
Images
(Click to enlarge in a new window)
Fig. 40, 3a, b. *S. fermori, ?Berriasian, Pakistan, X0.3 (Spath, 1939a), FIG. 40, 3c, d. S. gallica (Mazenot), Lower Berriasian, France, X1 (Mazenot, 1939)
Synonyms
Subthurmanniceras, Tirnovella, Fauriella, Strambergella, Pseudoneocomites
Geographic Distribution
southern Europe, Pakistan, Peru
Age Range
Beginning Stage in Treatise Usage:
Upper Jurassic (Upper Tithonian)
Beginning International Stage:
Tithonian
Fraction Up In Beginning Stage:
70
Beginning Date:
144.94
Ending Stage in Treatise Usage:
Lower Cretaceous (Lower Valanginian)
Ending International Stage:
Valanginian
Fraction Up In Ending Stage:
45
Ending Date:
135.41
Description
Rather evolute, compressed, with gently convex sides; early whorls with flat venter and with ribs single or in pairs at umbilical margin, the branching point raised in a slight bulla, and with most ribs branching again at outer third of side; later whorls with rounded venter, with or without smooth band or shallow groove, in some with primary ribs becoming coarse and distant. [Separation as Tirnovella of slightly more involute, higher-whorled species with tendency of ornament to weaken on body chamber seems unnecessary.]