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Costatoria
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Myophoriidae
Formal Genus Name and Reference:
Costatoria WAAGEN, 1906, p. 393
Type Species:
Donax costata Zenker, 1833, p. 55, SD NAKAZAWA, 1960, p. 52
Images
(Click to enlarge in a new window)
Fig. D63, 3a. C. goldfussi (Alberti), M.Trias.(Muschelkalk), Ger., LV ext., X3.3 (HohenstE1n, 1913), Fig. D63,3b,c. C. whateleyae (von Buch), U.Trias., S.Tyrol, 3 b, c, RV ext. and int., X1.6 (58)
Synonyms
Geographic Distribution
L.Perm., USA(Tex.-Wyo.); U.Perm., Japan-Eu.(Alps); L.Trias.-U.Trias., cosmo
Age Range
Beginning Stage in Treatise Usage:
L.Perm., U.Perm., L.Trias.
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
U.Trias.
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Trigonally ovate to rhomboidal, moderately inequilateral, marginal carina more or less pronounced, escutcheon defined but small, flank with number of prominent, unevenly spaced radial ribs and smooth or concentrically striated interspaces, area smooth or with weak radial ribs, left valve with median tooth strong and simple, anterior tooth moderately strong, short, and posterior tooth thin, elongate, and marginal, right valve with anterior and posterior teeth moderately strong, subequal, sides of teeth transversely grooved in larger species, myophorous buttress present
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Myophoriidae
Formal Genus Name and Reference:
Costatoria WAAGEN, 1906, p. 393
Type Species:
Donax costata Zenker, 1833, p. 55, SD NAKAZAWA, 1960, p. 52
Images
(Click to enlarge in a new window)
Fig. D63, 3a. C. goldfussi (Alberti), M.Trias.(Muschelkalk), Ger., LV ext., X3.3 (HohenstE1n, 1913), Fig. D63,3b,c. C. whateleyae (von Buch), U.Trias., S.Tyrol, 3 b, c, RV ext. and int., X1.6 (58)
Synonyms
Geographic Distribution
L.Perm., USA(Tex.-Wyo.); U.Perm., Japan-Eu.(Alps); L.Trias.-U.Trias., cosmo
Age Range
Beginning Stage in Treatise Usage:
L.Perm., U.Perm., L.Trias.
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
U.Trias.
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Trigonally ovate to rhomboidal, moderately inequilateral, marginal carina more or less pronounced, escutcheon defined but small, flank with number of prominent, unevenly spaced radial ribs and smooth or concentrically striated interspaces, area smooth or with weak radial ribs, left valve with median tooth strong and simple, anterior tooth moderately strong, short, and posterior tooth thin, elongate, and marginal, right valve with anterior and posterior teeth moderately strong, subequal, sides of teeth transversely grooved in larger species, myophorous buttress present