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Buchia
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Pteriomorphia
Order:
Pterioida
Suborder:
Pteriina
Superfamily:
Pectinacea (scallops and relatives)
Family:
Buchiidae
Formal Genus Name and Reference:
Buchia ROUILLIER, 1845, p. 289
Type Species:
Avicula mosquensis von BUCH, 1844, p. 537, M
Images
(Click to enlarge in a new window)
Fig. C96,1a,b. *B. mosquensis (von Buch), U.Jur.(L.Volg.), USSR, 1 a, b, LV ext., RV view of both valves, X1 (Lahusen, 1888)., Fig. C96,1c,d. B. subovalis (Pavlov), U.Jur.(L.Volg.), USSR, 1 c, d, RV ext., int., X1, X 2, showing auricle (Pavlov, 1907)., Fig. C96,1e. B. keyserlingi Lahusen, L.Cret.
Synonyms
Geographic Distribution
M.Jur.(Aalen.)-L.Cret., cosmop., most abundant in boreal regions, U.Jur.-U.Cret.(Maastricht.), Ind.O.(Madag.)-USSR.
Age Range
Beginning Stage in Treatise Usage:
M.Jur.(Aalen.)
Beginning International Stage:
Aalenian
Fraction Up In Beginning Stage:
0
Beginning Date:
174.7
Ending Stage in Treatise Usage:
L.Cret., U.Jur.-U.Cret.(Maastricht.)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Strongly prosocline, height well exceeding length, highly inequivalve, LV strongly convex with more or less prominently projecting umbo and prosogyrous beak, RV flat to feebly convex with its umbo scarcely projecting, right anterior auricle concave tonguelike process which is not in alignment with hinge margin but extends toward LV and rests in socket in its cardinal area in front of beak, cardinal area an inequilateral triangle of moderate breadth in each valve, with shallow ligamental pit directed backward from beak, pit of LV with raised margins, ornament of concentric ridges or ribs, with subordinate radial threads in some species
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Pteriomorphia
Order:
Pterioida
Suborder:
Pteriina
Superfamily:
Pectinacea (scallops and relatives)
Family:
Buchiidae
Formal Genus Name and Reference:
Buchia ROUILLIER, 1845, p. 289
Type Species:
Avicula mosquensis von BUCH, 1844, p. 537, M
Images
(Click to enlarge in a new window)
Fig. C96,1a,b. *B. mosquensis (von Buch), U.Jur.(L.Volg.), USSR, 1 a, b, LV ext., RV view of both valves, X1 (Lahusen, 1888)., Fig. C96,1c,d. B. subovalis (Pavlov), U.Jur.(L.Volg.), USSR, 1 c, d, RV ext., int., X1, X 2, showing auricle (Pavlov, 1907)., Fig. C96,1e. B. keyserlingi Lahusen, L.Cret.
Synonyms
Geographic Distribution
M.Jur.(Aalen.)-L.Cret., cosmop., most abundant in boreal regions, U.Jur.-U.Cret.(Maastricht.), Ind.O.(Madag.)-USSR.
Age Range
Beginning Stage in Treatise Usage:
M.Jur.(Aalen.)
Beginning International Stage:
Aalenian
Fraction Up In Beginning Stage:
0
Beginning Date:
174.7
Ending Stage in Treatise Usage:
L.Cret., U.Jur.-U.Cret.(Maastricht.)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Strongly prosocline, height well exceeding length, highly inequivalve, LV strongly convex with more or less prominently projecting umbo and prosogyrous beak, RV flat to feebly convex with its umbo scarcely projecting, right anterior auricle concave tonguelike process which is not in alignment with hinge margin but extends toward LV and rests in socket in its cardinal area in front of beak, cardinal area an inequilateral triangle of moderate breadth in each valve, with shallow ligamental pit directed backward from beak, pit of LV with raised margins, ornament of concentric ridges or ribs, with subordinate radial threads in some species