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Pleuromya
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Anomalodesmata
Order:
Pholadomyoida
Superfamily:
Pholadomyacea
Family:
Pleuromyidae
Formal Genus Name and Reference:
Pleuromya AGASSIZ, 1842, p. 439
Type Species:
Mya gibbosa J. de C. Sowerby, 1823, p. 19 (=Donacites alduini BRONGNIART, 1821, p. 555), M
Images
(Click to enlarge in a new window)
Fig. F21,la. *P. alduini (BRONGNIART), U.Jur.(U.Oxford Clay), Eng.; RV ext., X1 (19f). --Fig. F21,lb. P. uniformis (J.SOWERBY), U.Jur.(Oxford), Eng.; RV composite ext.-int., showing pallial line, etc. (not retouched), X1 (Cox, n).--Fig. F21,lc. P. ,wiformis, U.Jur.(Corallian Beds), Eng.; LV hinge tilted slightly toward observer, showing protuber- ance just anterior to beak, X2 (Cox, n). --Fig. F21,ld. P. marginata AGASSIZ, M.Jur.(Bathon.), France; diagram showing relation between pro- tuberances of hinge margins of valves, LV on left, en!. (Douville, 1907). --Fig. F21,le,f. P. uniformis, M.Jur.(Inf. Oolite), Eng.; 1e,f, trans- verse sections through dorsal region of slightly separated valves, on left, 1e just behind, 1f just in front of beaks, X2 (Cox, n)
Synonyms
Myacites, Anaplomya, Anoplomya, Hapalomya, Hapalomia, ?Fogiella
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Trias.
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
L.Cret.
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Characters of family = Shell of medium size, equivalve, oval, oblong or trapeziform, moderately to strongly inflated, with narrow to moderately wide posterior gape; umbones situated within anterior half and usually well toward anterior end of shell, broadly rounded, not strongly protruding; no demarcated dorsal areas; no true hinge teeth; main part of ligament external, opisthodetic, with short supporting nymphs; below and slightly an- terior to the beak of each valve is short, rounded protuberance of margin, slightly hollowed out above, and behind protuberance is small niche; protuberance of RV fits above that of the left, a small internal liga- ment possibly occupying the space between them; postero-dorsal margin of RV overlapping that of L V ; pallial sinus deep; ostracum thin, probably originally nacreous internally. Surface with or without concentric ribbing and with a delicate orna- ment of radial rows of minute pustules.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Anomalodesmata
Order:
Pholadomyoida
Superfamily:
Pholadomyacea
Family:
Pleuromyidae
Formal Genus Name and Reference:
Pleuromya AGASSIZ, 1842, p. 439
Type Species:
Mya gibbosa J. de C. Sowerby, 1823, p. 19 (=Donacites alduini BRONGNIART, 1821, p. 555), M
Images
(Click to enlarge in a new window)
Fig. F21,la. *P. alduini (BRONGNIART), U.Jur.(U.Oxford Clay), Eng.; RV ext., X1 (19f). --Fig. F21,lb. P. uniformis (J.SOWERBY), U.Jur.(Oxford), Eng.; RV composite ext.-int., showing pallial line, etc. (not retouched), X1 (Cox, n).--Fig. F21,lc. P. ,wiformis, U.Jur.(Corallian Beds), Eng.; LV hinge tilted slightly toward observer, showing protuber- ance just anterior to beak, X2 (Cox, n). --Fig. F21,ld. P. marginata AGASSIZ, M.Jur.(Bathon.), France; diagram showing relation between pro- tuberances of hinge margins of valves, LV on left, en!. (Douville, 1907). --Fig. F21,le,f. P. uniformis, M.Jur.(Inf. Oolite), Eng.; 1e,f, trans- verse sections through dorsal region of slightly separated valves, on left, 1e just behind, 1f just in front of beaks, X2 (Cox, n)
Synonyms
Myacites, Anaplomya, Anoplomya, Hapalomya, Hapalomia, ?Fogiella
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Trias.
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
L.Cret.
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Characters of family = Shell of medium size, equivalve, oval, oblong or trapeziform, moderately to strongly inflated, with narrow to moderately wide posterior gape; umbones situated within anterior half and usually well toward anterior end of shell, broadly rounded, not strongly protruding; no demarcated dorsal areas; no true hinge teeth; main part of ligament external, opisthodetic, with short supporting nymphs; below and slightly an- terior to the beak of each valve is short, rounded protuberance of margin, slightly hollowed out above, and behind protuberance is small niche; protuberance of RV fits above that of the left, a small internal liga- ment possibly occupying the space between them; postero-dorsal margin of RV overlapping that of L V ; pallial sinus deep; ostracum thin, probably originally nacreous internally. Surface with or without concentric ribbing and with a delicate orna- ment of radial rows of minute pustules.