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Trigonodus
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Unionoida (Freshwater mussels and relatives)
Superfamily:
Unionacea (freshwater mussels)
Family:
Pachycardiidae
Formal Genus Name and Reference:
Trigonodus Sandberger in ALBERTI, 1864
Type Species:
T. sandbergeri, SD STOLICZKA, 1871
Images
(Click to enlarge in a new window)
Fig. D59,4a,b. *T. sandbergeri, U.Trias.(Lettenkohle), Ger., 4a, b, LV int., RV int., from wax impressions, X1 (Sandberger, 1864); Fig. D59,4c,d. T. carniolicus Bittner, U.Trias.(Carn.), Yugo., LV ext., LV int., X1 (950); Fig. D59,4e. T. problematicus (KlipstE1n), U.Trias. (Carn.), Yugo., RV int., X1 (950)
Synonyms
Geographic Distribution
Eu., Asia, N. Am., N.Z.
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.Trias.
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Medium-sized, ovate to trapeziform, strongly inequilateral, moderately inflated, no lunule or escutcheon, ligament external, but rather submerged in some species. . LV with stout, triangular, commonly grooved, .main cardinal tooth separated by broad recess from anterodorsal margin (where presence of weak anterior cardinal is inconstant) and with 2 thin, elongate posterior laterals; RV with stout, triangular, commonly grooved, anteriorly placed cardinal tooth and elongate posterior lateral which is received in recess between 2 laterals of other valve; some species with internal radial buttress which passes from umbo to anterior side of pos- terior adductor scar. Surface smooth or concentrically ridged. [Brackish-water or marine.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Unionoida (Freshwater mussels and relatives)
Superfamily:
Unionacea (freshwater mussels)
Family:
Pachycardiidae
Formal Genus Name and Reference:
Trigonodus Sandberger in ALBERTI, 1864
Type Species:
T. sandbergeri, SD STOLICZKA, 1871
Images
(Click to enlarge in a new window)
Fig. D59,4a,b. *T. sandbergeri, U.Trias.(Lettenkohle), Ger., 4a, b, LV int., RV int., from wax impressions, X1 (Sandberger, 1864); Fig. D59,4c,d. T. carniolicus Bittner, U.Trias.(Carn.), Yugo., LV ext., LV int., X1 (950); Fig. D59,4e. T. problematicus (KlipstE1n), U.Trias. (Carn.), Yugo., RV int., X1 (950)
Synonyms
Geographic Distribution
Eu., Asia, N. Am., N.Z.
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.Trias.
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Medium-sized, ovate to trapeziform, strongly inequilateral, moderately inflated, no lunule or escutcheon, ligament external, but rather submerged in some species. . LV with stout, triangular, commonly grooved, .main cardinal tooth separated by broad recess from anterodorsal margin (where presence of weak anterior cardinal is inconstant) and with 2 thin, elongate posterior laterals; RV with stout, triangular, commonly grooved, anteriorly placed cardinal tooth and elongate posterior lateral which is received in recess between 2 laterals of other valve; some species with internal radial buttress which passes from umbo to anterior side of pos- terior adductor scar. Surface smooth or concentrically ridged. [Brackish-water or marine.]