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Homomya
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Anomalodesmata
Order:
Pholadomyoida
Superfamily:
Pholadomyacea
Family:
Pholadomyidae
Formal Genus Name and Reference:
Homomya AGASSIZ, 1843, p. 154
Type Species:
Mactra gibbosa J. Sowerby, 1813, p. 91, SD HERRMANNSEN, 1847, p. 541
Images
(Click to enlarge in a new window)
Fig. F13,3. *H. gibbosa (SOWERBY), M.Jur. (Bathon.), Eng.; 3a,b, LV ext., both valves dorsal (holotype), X0.7 (Cox, n)
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
M.Trias.(Muschelkalk}
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
U.Jur. (Portland.)
Ending International Stage:
Berriasian
Fraction Up In Ending Stage:
25
Ending Date:
141.75
Description
Resembling Pholadomya (Pholadomya) in shape except that in some species umbones are less prominent, without radial ribbing, unless in earliest stages of growth; hinge margin smooth, uninerrupted; pallial sinus deep. [The commoner Muschelkalk species which have been referred to this genus seem better included in Pachymya (Arcomya}]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Anomalodesmata
Order:
Pholadomyoida
Superfamily:
Pholadomyacea
Family:
Pholadomyidae
Formal Genus Name and Reference:
Homomya AGASSIZ, 1843, p. 154
Type Species:
Mactra gibbosa J. Sowerby, 1813, p. 91, SD HERRMANNSEN, 1847, p. 541
Images
(Click to enlarge in a new window)
Fig. F13,3. *H. gibbosa (SOWERBY), M.Jur. (Bathon.), Eng.; 3a,b, LV ext., both valves dorsal (holotype), X0.7 (Cox, n)
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
M.Trias.(Muschelkalk}
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
U.Jur. (Portland.)
Ending International Stage:
Berriasian
Fraction Up In Ending Stage:
25
Ending Date:
141.75
Description
Resembling Pholadomya (Pholadomya) in shape except that in some species umbones are less prominent, without radial ribbing, unless in earliest stages of growth; hinge margin smooth, uninerrupted; pallial sinus deep. [The commoner Muschelkalk species which have been referred to this genus seem better included in Pachymya (Arcomya}]