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Unionites
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Unionoida (Freshwater mussels and relatives)
Superfamily:
Unionacea (freshwater mussels)
Family:
Pachycardiidae
Formal Genus Name and Reference:
Unionites WISSMANN, 1841
Type Species:
U. muensteri, OD
Images
(Click to enlarge in a new window)
Fic. D59,1a-c. *U. muensteri, U.Trias. (Carn.), S.Tyrol, RV ext., RV hinge, LV hinge, all * (58). -- Fig. D59,1d. U. rectus (Gümbel), U.Trias.(Carn.), N.Tyrol, RV int., * (1001).
Synonyms
Anoplophora, Uniona, Anodontophora, Anaplophora, Anoplophoria, Unionina, Anodonthophora
Geographic Distribution
Eu.-Asia-Arctic O.(Spitz.-Bear I.)-N.Z.
Age Range
Beginning Stage in Treatise Usage:
L.Trias.
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
U.Trias.
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Small, ovate rectangular or trapeziform, inequilateral, of feeble to moderate convexity, lunule and escutcheon present or absent, ligament external, opisthodetic, nymphs not prominent. Subumbonal teeth, if distinguishable at all, usually weak and amorphous, one in each valve; anterior laterals usually absent; one distinguishable in RV in some forms; weak, elongate posterior lateral present in both valves, extending almost to beak, that of LV formed by lamina projecting from margin; shorter and more remole lateral may occupy posterodorsal angle of valves; some species with weak internal radial buttress on posterior side of anterior adductor scar. Surface smooth. [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:
Unionites WISSMANN, 1841
Type Species:
U. muensteri, OD
Images
(Click to enlarge in a new window)
Fic. D59,1a-c. *U. muensteri, U.Trias. (Carn.), S.Tyrol, RV ext., RV hinge, LV hinge, all * (58). -- Fig. D59,1d. U. rectus (Gümbel), U.Trias.(Carn.), N.Tyrol, RV int., * (1001).
Synonyms
Anoplophora, Uniona, Anodontophora, Anaplophora, Anoplophoria, Unionina, Anodonthophora
Geographic Distribution
Eu.-Asia-Arctic O.(Spitz.-Bear I.)-N.Z.
Age Range
Beginning Stage in Treatise Usage:
L.Trias.
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
U.Trias.
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Small, ovate rectangular or trapeziform, inequilateral, of feeble to moderate convexity, lunule and escutcheon present or absent, ligament external, opisthodetic, nymphs not prominent. Subumbonal teeth, if distinguishable at all, usually weak and amorphous, one in each valve; anterior laterals usually absent; one distinguishable in RV in some forms; weak, elongate posterior lateral present in both valves, extending almost to beak, that of LV formed by lamina projecting from margin; shorter and more remole lateral may occupy posterodorsal angle of valves; some species with weak internal radial buttress on posterior side of anterior adductor scar. Surface smooth. [Brackish-water or marine.]