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Laevitrigonia
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Trigoniidae
Formal Genus Name and Reference:
Laevitrigonia LEBKÜCHNER, 1932, p. 35
Type Species:
Trigonia gibbosa J. SOWERBY, 1819, p. 61, OD
Images
(Click to enlarge in a new window)
Fig. D69,1. *L. (L.) gibbosa (J. Sowerby), U.Jur.(Portland.), Eng., RV ext., X0.85 (554)
Synonyms
Laevitrigonia
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
L.Jur.(Lias.)
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Ovate, inequilateral, smooth, shallow antecarinal depression usually present, flank, if not almost smooth, ornamented with weak, irregularly spaced concentric costae commonly broken up into pustules, or with oblique rows of pustules
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Trigoniidae
Formal Genus Name and Reference:
Laevitrigonia LEBKÜCHNER, 1932, p. 35
Type Species:
Trigonia gibbosa J. SOWERBY, 1819, p. 61, OD
Images
(Click to enlarge in a new window)
Fig. D69,1. *L. (L.) gibbosa (J. Sowerby), U.Jur.(Portland.), Eng., RV ext., X0.85 (554)
Synonyms
Laevitrigonia
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
L.Jur.(Lias.)
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Ovate, inequilateral, smooth, shallow antecarinal depression usually present, flank, if not almost smooth, ornamented with weak, irregularly spaced concentric costae commonly broken up into pustules, or with oblique rows of pustules