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Pholadomya
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Anomalodesmata
Order:
Pholadomyoida
Superfamily:
Pholadomyacea
Family:
Pholadomyidae
Formal Genus Name and Reference:
Pholadomya G.B. SOWERBY, 1823
Type Species:
P. candida, SD GRAY, 1847, p. 194
Images
(Click to enlarge in a new window)
Fig. F9,la-d. *P. (P.) candida G.B. SOWERBY, Rec., Carib.; 1a-c, holotype, RV ext., RV into (showing pallial line), and dorsal view of both valves (all x0.7); 1d, hinge region of RV showing liga- mental nymph and shallow rhombic subumbonal pit for internal ligament, small, obtusely angular projection of margin below it (X2) (Cox, n). -- Fig.. F9,1e. P. (P .) ambigua 0. SOWERBY), L.Jur.(Lias.), Eng.; LV ext., XO.7 (Cox, n ). -- Fig. F9,1j. P. (P.) leonensis STENZEL, KRAUSE & TWINING, Eoc., USA (Tex.) ; pustulose ornament, X4 (Stenzel, Krause & Twining, 1957)
Synonyms
Pholadomyaea, Pholadomia, Phaladomya, Pholadomye, Pholdomya, Pholodomya, Pholadonya
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
U.Trias.
Beginning International Stage:
Carnian
Fraction Up In Beginning Stage:
0
Beginning Date:
237
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Medium-sized to large, ovate to subtrigonal, strongly inequilateral, ventricose, most so anteriorly, umbones broadly rounded to subangular, of variable prominence, more or less anteriorly placed, valves gaping posteriorly to variable extent, anterior gape narrow or absent, pustulation of surface very delicate, ornament usually strongly developed, but weak in some forms and consisting of radial ribs or ridges, commonly bearing tubercles, and of concentric undulations or rugae, pallial sinus broad, of moderate depth. [Although sevaal Recent species from various parts of the world have been described under Pholadomya, the type species is the only one resembling the numerous fossil forms in size and shape. The remainder are relatively small shells, some of which belong to the genus Panacea DALE. (see below), while some others, particularly certain very small forms from the Antarctic, should probably be included in one or more new genera. All known Recent Pholadomyidae are moderately deep- to deep~water forms, whereas the Mesozoic species of the family are found commonly in shallow·water sediments. No satisfactory sub-generic classification of the numerous species of Pholadomya has yet been achieved and a thorough revision of the genus would result in the recognition of many more sub- generic groups than those here distinguished.]
References
Sowerby, J. de C., 1823-25, The mineral conchology of Great Britain: v. 5, 168 p., pl. 407-503, the author (London).
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Anomalodesmata
Order:
Pholadomyoida
Superfamily:
Pholadomyacea
Family:
Pholadomyidae
Formal Genus Name and Reference:
Pholadomya G.B. SOWERBY, 1823
Type Species:
P. candida, SD GRAY, 1847, p. 194
Images
(Click to enlarge in a new window)
Fig. F9,la-d. *P. (P.) candida G.B. SOWERBY, Rec., Carib.; 1a-c, holotype, RV ext., RV into (showing pallial line), and dorsal view of both valves (all x0.7); 1d, hinge region of RV showing liga- mental nymph and shallow rhombic subumbonal pit for internal ligament, small, obtusely angular projection of margin below it (X2) (Cox, n). -- Fig.. F9,1e. P. (P .) ambigua 0. SOWERBY), L.Jur.(Lias.), Eng.; LV ext., XO.7 (Cox, n ). -- Fig. F9,1j. P. (P.) leonensis STENZEL, KRAUSE & TWINING, Eoc., USA (Tex.) ; pustulose ornament, X4 (Stenzel, Krause & Twining, 1957)
Synonyms
Pholadomyaea, Pholadomia, Phaladomya, Pholadomye, Pholdomya, Pholodomya, Pholadonya
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
U.Trias.
Beginning International Stage:
Carnian
Fraction Up In Beginning Stage:
0
Beginning Date:
237
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Medium-sized to large, ovate to subtrigonal, strongly inequilateral, ventricose, most so anteriorly, umbones broadly rounded to subangular, of variable prominence, more or less anteriorly placed, valves gaping posteriorly to variable extent, anterior gape narrow or absent, pustulation of surface very delicate, ornament usually strongly developed, but weak in some forms and consisting of radial ribs or ridges, commonly bearing tubercles, and of concentric undulations or rugae, pallial sinus broad, of moderate depth. [Although sevaal Recent species from various parts of the world have been described under Pholadomya, the type species is the only one resembling the numerous fossil forms in size and shape. The remainder are relatively small shells, some of which belong to the genus Panacea DALE. (see below), while some others, particularly certain very small forms from the Antarctic, should probably be included in one or more new genera. All known Recent Pholadomyidae are moderately deep- to deep~water forms, whereas the Mesozoic species of the family are found commonly in shallow·water sediments. No satisfactory sub-generic classification of the numerous species of Pholadomya has yet been achieved and a thorough revision of the genus would result in the recognition of many more sub- generic groups than those here distinguished.]
References
Sowerby, J. de C., 1823-25, The mineral conchology of Great Britain: v. 5, 168 p., pl. 407-503, the author (London).