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Liostrea
Classification
Phylum:
Mollusca
Class:
None
Subclass:
Pteriomorphia
Order:
Pterioida
Suborder:
Ostreina (oysters)
Superfamily:
Ostreacea
Family:
Gryphaeidae
Subfamily:
Gryphaeinae
Formal Genus Name and Reference:
Liostrea Douvillé, 1904b, p. 546, Liostrea DOUVILLÉ, 1904a, v. 3, pt. 4, p. 273
Type Species:
Ostrea sublamellosa DUNKER, 1846, OD
Images
(Click to enlarge in a new window)
Fig. J77,1. L. hisingeri (Nilsson, 1832) (=Ostrea anomala Terquem, 1855), Lias., Luxembourg; 1a-c, X1.4 (Terquem, 1855). [See also Fig. J61.]
Synonyms
Geographic Distribution
U.Trias. (Nor.), Far E.Sib.: U.Trias. (Rhaet.)-Jur., Eu. (Mesogaean region)
Age Range
Beginning Stage in Treatise Usage:
U.Trias. (Nor.)
Beginning International Stage:
Norian
Fraction Up In Beginning Stage:
0
Beginning Date:
227.3
Ending Stage in Treatise Usage:
Jur.,
Ending International Stage:
Tithonian
Fraction Up In Ending Stage:
100
Ending Date:
143.1
Description
Small (up to 3 cm . long and 5 cm . high), subequivalve but preponderantly inequivalve, outline irregular but tending to spatulate, margins tending to converge toward umbo, some individuals slightly crescentic. LV variable, mostly capacious and highly convex in anteroposterior direction, much less so dorsoventrally, attachment area fairly large for so small a shell, correspondingly large bulging xenomorphic area on RV umbo. RV variable, gently convex to flat or slightly concave beyond xenomorphic area. Both valves carry low concentric swellings and simple irregularly spaced growth squamae, very poorly or not at all appressed. Radial posterior sulcus of LV absent in some but present in many individuals, well developed, deep, and broad, posterior flange not detached. Sulcus appearing rather early in some individuals, that is, near attachment area. Resilifer about twice as long as each bourrelet.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
None
Subclass:
Pteriomorphia
Order:
Pterioida
Suborder:
Ostreina (oysters)
Superfamily:
Ostreacea
Family:
Gryphaeidae
Subfamily:
Gryphaeinae
Formal Genus Name and Reference:
Liostrea Douvillé, 1904b, p. 546, Liostrea DOUVILLÉ, 1904a, v. 3, pt. 4, p. 273
Type Species:
Ostrea sublamellosa DUNKER, 1846, OD
Images
(Click to enlarge in a new window)
Fig. J77,1. L. hisingeri (Nilsson, 1832) (=Ostrea anomala Terquem, 1855), Lias., Luxembourg; 1a-c, X1.4 (Terquem, 1855). [See also Fig. J61.]
Synonyms
Geographic Distribution
U.Trias. (Nor.), Far E.Sib.: U.Trias. (Rhaet.)-Jur., Eu. (Mesogaean region)
Age Range
Beginning Stage in Treatise Usage:
U.Trias. (Nor.)
Beginning International Stage:
Norian
Fraction Up In Beginning Stage:
0
Beginning Date:
227.3
Ending Stage in Treatise Usage:
Jur.,
Ending International Stage:
Tithonian
Fraction Up In Ending Stage:
100
Ending Date:
143.1
Description
Small (up to 3 cm . long and 5 cm . high), subequivalve but preponderantly inequivalve, outline irregular but tending to spatulate, margins tending to converge toward umbo, some individuals slightly crescentic. LV variable, mostly capacious and highly convex in anteroposterior direction, much less so dorsoventrally, attachment area fairly large for so small a shell, correspondingly large bulging xenomorphic area on RV umbo. RV variable, gently convex to flat or slightly concave beyond xenomorphic area. Both valves carry low concentric swellings and simple irregularly spaced growth squamae, very poorly or not at all appressed. Radial posterior sulcus of LV absent in some but present in many individuals, well developed, deep, and broad, posterior flange not detached. Sulcus appearing rather early in some individuals, that is, near attachment area. Resilifer about twice as long as each bourrelet.