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Iotrigonia
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Trigoniidae
Formal Genus Name and Reference:
Iotrigonia van HOEPEN, 1929, p. 6
Type Species:
I. crassitesta, OD
Images
(Click to enlarge in a new window)
Fig. D68, 9. I. haughtoni (Rennie), L.Cret.(Neocom.), S. Afr., RV ext., X0.7 (785)
Synonyms
Geographic Distribution
S.Afr.-Asia-S.Am.-Australia-N.Z.-Antarctic
Age Range
Beginning Stage in Treatise Usage:
L.Cret.
Beginning International Stage:
Berriasian
Fraction Up In Beginning Stage:
0
Beginning Date:
143.1
Ending Stage in Treatise Usage:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Elongate, ovate or sublunate, strongly inequilateral, umbones prominent, marginal and escutcheon carinae rounded off, area smooth, with median groove, flank costae belonging to 2 series, which in earlier or in all growth stages meet in an acute, down-pointing V.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Trigoniidae
Formal Genus Name and Reference:
Iotrigonia van HOEPEN, 1929, p. 6
Type Species:
I. crassitesta, OD
Images
(Click to enlarge in a new window)
Fig. D68, 9. I. haughtoni (Rennie), L.Cret.(Neocom.), S. Afr., RV ext., X0.7 (785)
Synonyms
Geographic Distribution
S.Afr.-Asia-S.Am.-Australia-N.Z.-Antarctic
Age Range
Beginning Stage in Treatise Usage:
L.Cret.
Beginning International Stage:
Berriasian
Fraction Up In Beginning Stage:
0
Beginning Date:
143.1
Ending Stage in Treatise Usage:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Elongate, ovate or sublunate, strongly inequilateral, umbones prominent, marginal and escutcheon carinae rounded off, area smooth, with median groove, flank costae belonging to 2 series, which in earlier or in all growth stages meet in an acute, down-pointing V.