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Trigonia
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Trigoniidae
Formal Genus Name and Reference:
Trigonia BRUGUIERE, 1789, p. xiv
Type Species:
Venus sulcata
HERMANN, 1781, pI. 4, fig. 9; 1CZN Opinion 327
(1955)
Images
(Click to enlarge in a new window)
Fig. D66,1. *T. (T.) sulcata (Hermann), L.Jur. (Toarc.), France(Alsace), LV ext., X0.7 (Bayle, 1878).
Synonyms
Lyridon, Lyriodon, Lyrodon
Geographic Distribution
cosmop
Age Range
Beginning Stage in Treatise Usage:
M. Trias.
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
U. Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Trigonal, umbones prominent, area wide, bipartite, radially costate, flank costate (except in a Triassic representative), ends of costae commonly separated from marginal carina in left valve or in both by smooth radial space. [The family Trigoniidae as now interpreted coincides with the single genus Trigonia of older authors.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Trigoniidae
Formal Genus Name and Reference:
Trigonia BRUGUIERE, 1789, p. xiv
Type Species:
Venus sulcata
HERMANN, 1781, pI. 4, fig. 9; 1CZN Opinion 327
(1955)
Images
(Click to enlarge in a new window)
Fig. D66,1. *T. (T.) sulcata (Hermann), L.Jur. (Toarc.), France(Alsace), LV ext., X0.7 (Bayle, 1878).
Synonyms
Lyridon, Lyriodon, Lyrodon
Geographic Distribution
cosmop
Age Range
Beginning Stage in Treatise Usage:
M. Trias.
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
U. Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Trigonal, umbones prominent, area wide, bipartite, radially costate, flank costate (except in a Triassic representative), ends of costae commonly separated from marginal carina in left valve or in both by smooth radial space. [The family Trigoniidae as now interpreted coincides with the single genus Trigonia of older authors.]