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Megatrigonia
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Trigoniidae
Formal Genus Name and Reference:
Megatrigonia van HOEPEN, 1929, p. 3
Type Species:
M. obesa, OD
Images
(Click to enlarge in a new window)
Fig. D72,2. *M. obesa, L. Cret.(Neocom.), S.Afr., LV ext., X0.45 (van Hoepen, 1929)
Synonyms
Geographic Distribution
S.Afr.-E. Afr.-India-S.Am.
Age Range
Beginning Stage in Treatise Usage:
U.Jur.(Tithon.)
Beginning International Stage:
Tithonian
Fraction Up In Beginning Stage:
0
Beginning Date:
149.24
Ending Stage in Treatise Usage:
L.Cret.
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Large, pyriform, marginal and escutcheon carinae absent except near umbo, area narrow, smooth, escutcheon deep, smooth, flank with steeply sloping, mostly oblique, rounded costae, of which those on its anterior half are broad and well separated but those on its posterior half narrow and close
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Trigoniidae
Formal Genus Name and Reference:
Megatrigonia van HOEPEN, 1929, p. 3
Type Species:
M. obesa, OD
Images
(Click to enlarge in a new window)
Fig. D72,2. *M. obesa, L. Cret.(Neocom.), S.Afr., LV ext., X0.45 (van Hoepen, 1929)
Synonyms
Geographic Distribution
S.Afr.-E. Afr.-India-S.Am.
Age Range
Beginning Stage in Treatise Usage:
U.Jur.(Tithon.)
Beginning International Stage:
Tithonian
Fraction Up In Beginning Stage:
0
Beginning Date:
149.24
Ending Stage in Treatise Usage:
L.Cret.
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Large, pyriform, marginal and escutcheon carinae absent except near umbo, area narrow, smooth, escutcheon deep, smooth, flank with steeply sloping, mostly oblique, rounded costae, of which those on its anterior half are broad and well separated but those on its posterior half narrow and close