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Lithiotis
Classification
Phylum:
Mollusca
Class:
None
Subclass:
Pteriomorphia
Order:
Pterioida
Suborder:
Ostreina (oysters)
Superfamily:
Families doubtfully related to Oysters
Family:
Lithiotidae
Formal Genus Name and Reference:
Lithiotis GÜMBEL, 1874, p. 48
Type Species:
L. problematica, M
Images
(Click to enlarge in a new window)
Fig. J150,1. *L. problematica, Italy (Verona prov.), la, RV int. (reconstr.) showing striated ligament area lacking median groove, ca. X0.2 1b,c, transv. sees. through upper part of valve in 2 different specimens, showing internal cavities (black); 1b showing 2 main cavities which have united (in more ventral section, 1c) to form umbanal cavity, while minor tubelike cavities in ostracum are' well seen in 1c; striated ligamental area is seen in section along top of each figure; X1.3 (all RE1s, 1903)
Synonyms
Geographic Distribution
Eu. (N.Italy-Croatia)-SW.Asia (?Iran)
Age Range
Beginning Stage in Treatise Usage:
L.jur. (L. Lias.)
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
L.jur. (L. Lias.)
Ending International Stage:
Sinemurian
Fraction Up In Ending Stage:
100
Ending Date:
192.9
Description
Moderately inequivalve, ligamental area striated in dorsoventral direction but without median groove for fibrous ligament, internal buttresses weak or absent, interior of wall of umbonal cavity formed of calcite prisms all oriented perpendicularly to its surface, minor tubular cavities, extending dorsoventrally and similarly surrounded, present within other parts of shell wall. [Since GUMBEL described it, believing it to be a lime-secreting alga, many authors have discussed its systematic position and some believed it to be an oyster close to Crassostrea. It is now placed in the Lithiotidae REIS, 1903, near the Spondylidae (see p. NI200).]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
None
Subclass:
Pteriomorphia
Order:
Pterioida
Suborder:
Ostreina (oysters)
Superfamily:
Families doubtfully related to Oysters
Family:
Lithiotidae
Formal Genus Name and Reference:
Lithiotis GÜMBEL, 1874, p. 48
Type Species:
L. problematica, M
Images
(Click to enlarge in a new window)
Fig. J150,1. *L. problematica, Italy (Verona prov.), la, RV int. (reconstr.) showing striated ligament area lacking median groove, ca. X0.2 1b,c, transv. sees. through upper part of valve in 2 different specimens, showing internal cavities (black); 1b showing 2 main cavities which have united (in more ventral section, 1c) to form umbanal cavity, while minor tubelike cavities in ostracum are' well seen in 1c; striated ligamental area is seen in section along top of each figure; X1.3 (all RE1s, 1903)
Synonyms
Geographic Distribution
Eu. (N.Italy-Croatia)-SW.Asia (?Iran)
Age Range
Beginning Stage in Treatise Usage:
L.jur. (L. Lias.)
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
L.jur. (L. Lias.)
Ending International Stage:
Sinemurian
Fraction Up In Ending Stage:
100
Ending Date:
192.9
Description
Moderately inequivalve, ligamental area striated in dorsoventral direction but without median groove for fibrous ligament, internal buttresses weak or absent, interior of wall of umbonal cavity formed of calcite prisms all oriented perpendicularly to its surface, minor tubular cavities, extending dorsoventrally and similarly surrounded, present within other parts of shell wall. [Since GUMBEL described it, believing it to be a lime-secreting alga, many authors have discussed its systematic position and some believed it to be an oyster close to Crassostrea. It is now placed in the Lithiotidae REIS, 1903, near the Spondylidae (see p. NI200).]