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Hyriopsis
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Unionoida (Freshwater mussels and relatives)
Superfamily:
Unionacea (freshwater mussels)
Family:
Unionidae
Subfamily:
Unioninae
Formal Genus Name and Reference:
Hyriopsis CONRAD, 1853
Type Species:
Unio delphinus Gruner, 1841 (non Spengler, 1793) (=Hyriopsis bialata SIMPSON, 1900), OD
Images
(Click to enlarge in a new window)
Fig. D23,2. *H. bialata Simpson, Rec., Eu., LV ext., X0.5 (Haas)
Synonyms
Geographic Distribution
Eu.-E.Asia-SE.Asia
Age Range
Beginning Stage in Treatise Usage:
Oligo.
Beginning International Stage:
Rupelian
Fraction Up In Beginning Stage:
0
Beginning Date:
33.9
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Large, compressed, heavy, rhomboidelliptical, low in front, high behind, commonly produced posteroventrally, winged dorsally, beaks low, compressed, sculpture consisting of numerous wavy ridges nearly parallel with growth lines, some extending over part of disc, periostracum greenish or brownish, with few rays, cardinals oblique to interdental interval, separating into denticles in old shell, with auxiliary cardinals, lamellar teeth long, somewhat curved, vertically striated in old shell, with lower auxiliary in some RV's, interdental interval long, narrow, curved
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Unionoida (Freshwater mussels and relatives)
Superfamily:
Unionacea (freshwater mussels)
Family:
Unionidae
Subfamily:
Unioninae
Formal Genus Name and Reference:
Hyriopsis CONRAD, 1853
Type Species:
Unio delphinus Gruner, 1841 (non Spengler, 1793) (=Hyriopsis bialata SIMPSON, 1900), OD
Images
(Click to enlarge in a new window)
Fig. D23,2. *H. bialata Simpson, Rec., Eu., LV ext., X0.5 (Haas)
Synonyms
Geographic Distribution
Eu.-E.Asia-SE.Asia
Age Range
Beginning Stage in Treatise Usage:
Oligo.
Beginning International Stage:
Rupelian
Fraction Up In Beginning Stage:
0
Beginning Date:
33.9
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Large, compressed, heavy, rhomboidelliptical, low in front, high behind, commonly produced posteroventrally, winged dorsally, beaks low, compressed, sculpture consisting of numerous wavy ridges nearly parallel with growth lines, some extending over part of disc, periostracum greenish or brownish, with few rays, cardinals oblique to interdental interval, separating into denticles in old shell, with auxiliary cardinals, lamellar teeth long, somewhat curved, vertically striated in old shell, with lower auxiliary in some RV's, interdental interval long, narrow, curved