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Dalmasiceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Neocomitidae
Formal Genus Name and Reference:
Dalmasiceras DJANÉLIDZÉ, 1922a, p. 256
Type Species:
Ammonites dalmasi Pictet, 1867, p. 73, SD ROMAN, 1938, p. 337
Images
(Click to enlarge in a new window)
Fig. 39, 4a-c. *D. dalmasi (Рістет), Upper Tithonian, France, neotype, X1 (Mazenot, 1939).
Synonyms
Geographic Distribution
southern Europe, Tunisia
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 (Upper Berriasian)
Ending International Stage:
Berriasian
Fraction Up In Ending Stage:
100
Ending Date:
137.7
Description
Compressed, early whorls with ribs branching from small but distinct umbilical tubercles, interrupted on venter and tending to form ventrolateral tubercles, later whorls with persistent umbilical tubercles but ribs tending to disappear and venter becoming rounded without groove
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Neocomitidae
Formal Genus Name and Reference:
Dalmasiceras DJANÉLIDZÉ, 1922a, p. 256
Type Species:
Ammonites dalmasi Pictet, 1867, p. 73, SD ROMAN, 1938, p. 337
Images
(Click to enlarge in a new window)
Fig. 39, 4a-c. *D. dalmasi (Рістет), Upper Tithonian, France, neotype, X1 (Mazenot, 1939).
Synonyms
Geographic Distribution
southern Europe, Tunisia
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 (Upper Berriasian)
Ending International Stage:
Berriasian
Fraction Up In Ending Stage:
100
Ending Date:
137.7
Description
Compressed, early whorls with ribs branching from small but distinct umbilical tubercles, interrupted on venter and tending to form ventrolateral tubercles, later whorls with persistent umbilical tubercles but ribs tending to disappear and venter becoming rounded without groove