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Pterotrigonia
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Trigoniidae
Formal Genus Name and Reference:
Pterotrigonia van HOEPEN, 1929, p. 9
Type Species:
P. cristata, OD
Images
(Click to enlarge in a new window)
Fig. D73,6. P. (P.) caudata (Agassiz), L.Cret.(Apt.), Eng., LV ext., X1 (554)
Synonyms
Geographic Distribution
cosmop.
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:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Club-shaped, gibbous, with narrow, elevated, strongly opisthogyrous umbones, marginal and escutcheon carinae ill-defined except near umbo, area very narrow, smooth or transversely ridged, strongly curved, with upward-facing concavity, escutcheon wide, well impressed near umbo, with transverse costellae, flank with steep, oblique, simple or tuberculate costae, internal radial ridge coinciding approximately with middle of area
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Trigoniidae
Formal Genus Name and Reference:
Pterotrigonia van HOEPEN, 1929, p. 9
Type Species:
P. cristata, OD
Images
(Click to enlarge in a new window)
Fig. D73,6. P. (P.) caudata (Agassiz), L.Cret.(Apt.), Eng., LV ext., X1 (554)
Synonyms
Geographic Distribution
cosmop.
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:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Club-shaped, gibbous, with narrow, elevated, strongly opisthogyrous umbones, marginal and escutcheon carinae ill-defined except near umbo, area very narrow, smooth or transversely ridged, strongly curved, with upward-facing concavity, escutcheon wide, well impressed near umbo, with transverse costellae, flank with steep, oblique, simple or tuberculate costae, internal radial ridge coinciding approximately with middle of area