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Cleiothyridina
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Athyridida
Superfamily:
Athyridoidea
Family:
Athyrididae
Formal Genus Name and Reference:
Cleiothyridina BUCKMAN, 1906, p. 324
Type Species:
Atrypa pectinifera J. de C. Sowerby, 1840 in 1840-1846, p. 14, validated by ICZN Opinion 1041, 1976, p. 210
Images
(Click to enlarge in a new window)
Fig. 1023a-e. * C. pectinifera (Sowerby), Kazanian, ?Tatarian, Durham, United Kingdom, $a-$ d, lectotype, dorsal, ventral, lateral, and posterior views, BMNH B61055, Sowerby Collection, x2$ (Brunton, 1980, photographs courtesy of C. H. C. Brunton), $e$, jugum, approximately x4.5$ (Davidson, 1857)., FIG. $1023 f$-g. C. seriata Grant, Artinskian, southern Thailand, $f$, cardinalia, USNM $497424, \\times 16.5, g$, anterior view into articulated umbones showing cardinalia and articulation, USNM 497425, x14$ (new).
Synonyms
Cliothyris, Cleiothyridellina, Gerankalasiella, Kjarkiella
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Upper Devonian (Famennian)
Beginning International Stage:
Famennian
Fraction Up In Beginning Stage:
0
Beginning Date:
371.1
Ending Stage in Treatise Usage:
Upper Permian (Kazanian, ?Tatarian)
Ending International Stage:
Wuchiapingian
Fraction Up In Ending Stage:
40
Ending Date:
257.43
Description
Medium-sized, transversely elliptical to longitudinally ovate, subequally biconvex shells. [Cleiothyridellina, from the Upper Permian of Nepal, is said to differ by having swollen shells, flat cardinal plate, and very short and low median septum, usually absent at maturity; Gerankalasiella and Kjarkiella from the Tournaisian of Transcaucasia are said to differ by having wider growth lamellae and spiral brachidium having a higher number of whorls (Gerankalasiella), while Kjarkiella has a larger size, high shell convexity, and very dense, narrow growth lamellae, weakly divided at margins.]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Athyridida
Superfamily:
Athyridoidea
Family:
Athyrididae
Formal Genus Name and Reference:
Cleiothyridina BUCKMAN, 1906, p. 324
Type Species:
Atrypa pectinifera J. de C. Sowerby, 1840 in 1840-1846, p. 14, validated by ICZN Opinion 1041, 1976, p. 210
Images
(Click to enlarge in a new window)
Fig. 1023a-e. * C. pectinifera (Sowerby), Kazanian, ?Tatarian, Durham, United Kingdom, $a-$ d, lectotype, dorsal, ventral, lateral, and posterior views, BMNH B61055, Sowerby Collection, x2$ (Brunton, 1980, photographs courtesy of C. H. C. Brunton), $e$, jugum, approximately x4.5$ (Davidson, 1857)., FIG. $1023 f$-g. C. seriata Grant, Artinskian, southern Thailand, $f$, cardinalia, USNM $497424, \\times 16.5, g$, anterior view into articulated umbones showing cardinalia and articulation, USNM 497425, x14$ (new).
Synonyms
Cliothyris, Cleiothyridellina, Gerankalasiella, Kjarkiella
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Upper Devonian (Famennian)
Beginning International Stage:
Famennian
Fraction Up In Beginning Stage:
0
Beginning Date:
371.1
Ending Stage in Treatise Usage:
Upper Permian (Kazanian, ?Tatarian)
Ending International Stage:
Wuchiapingian
Fraction Up In Ending Stage:
40
Ending Date:
257.43
Description
Medium-sized, transversely elliptical to longitudinally ovate, subequally biconvex shells. [Cleiothyridellina, from the Upper Permian of Nepal, is said to differ by having swollen shells, flat cardinal plate, and very short and low median septum, usually absent at maturity; Gerankalasiella and Kjarkiella from the Tournaisian of Transcaucasia are said to differ by having wider growth lamellae and spiral brachidium having a higher number of whorls (Gerankalasiella), while Kjarkiella has a larger size, high shell convexity, and very dense, narrow growth lamellae, weakly divided at margins.]