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Beitaia
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Atrypoidea
Family:
Atrypinidae
Formal Genus Name and Reference:
Beitaia Rong, Xu, & YANG, 1974, p. 199
Type Species:
B. modica, OD
Images
(Click to enlarge in a new window)
Fig. 965, 4a-g. $* B$. modica, middle Llandovery, Guizhou, $a-d$, dorsal, posterior, anterior, lateral views, x2$, enlargement of fine ribs, x4$ (Rong, Xu, & Yang, 1974), f-g, serial sections, x2.5$ (Rong & Yang, 1981).
Synonyms
Geographic Distribution
southern China (Guizhou, Hubei, Sichuan)
Age Range
Beginning Stage in Treatise Usage:
Silurian (middle Llandovery)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
66
Beginning Date:
439.24
Ending Stage in Treatise Usage:
Silurian (middle Llandovery)
Ending International Stage:
Aeronian
Fraction Up In Ending Stage:
100
Ending Date:
438.59
Description
Small to medium, ventribiconvex to nearly convexoplane, very finely ribbed to almost smooth septatrypiform shell; orthocline-anacline area; protruding beak; small apical foramen; deltidial plates; ribs very fine (costellate) to nearly invisible, lacking growth interruptions; distinct concentric growth filae; commissure with high, wide, U-shaped fold; interior with large dental cavities, long dental plates; delicate hinge plates; dorsally directed spiralia with fewer than 11 whorls; jugal processes delicate. [Differs from Clintonella in very fine ribs, high dorsal fold, and broader shell, from Anabaria by septatrypid shape, large and wide fold, very fine ribs, worn shells may be mistaken for Septatrypa.]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Atrypoidea
Family:
Atrypinidae
Formal Genus Name and Reference:
Beitaia Rong, Xu, & YANG, 1974, p. 199
Type Species:
B. modica, OD
Images
(Click to enlarge in a new window)
Fig. 965, 4a-g. $* B$. modica, middle Llandovery, Guizhou, $a-d$, dorsal, posterior, anterior, lateral views, x2$, enlargement of fine ribs, x4$ (Rong, Xu, & Yang, 1974), f-g, serial sections, x2.5$ (Rong & Yang, 1981).
Synonyms
Geographic Distribution
southern China (Guizhou, Hubei, Sichuan)
Age Range
Beginning Stage in Treatise Usage:
Silurian (middle Llandovery)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
66
Beginning Date:
439.24
Ending Stage in Treatise Usage:
Silurian (middle Llandovery)
Ending International Stage:
Aeronian
Fraction Up In Ending Stage:
100
Ending Date:
438.59
Description
Small to medium, ventribiconvex to nearly convexoplane, very finely ribbed to almost smooth septatrypiform shell; orthocline-anacline area; protruding beak; small apical foramen; deltidial plates; ribs very fine (costellate) to nearly invisible, lacking growth interruptions; distinct concentric growth filae; commissure with high, wide, U-shaped fold; interior with large dental cavities, long dental plates; delicate hinge plates; dorsally directed spiralia with fewer than 11 whorls; jugal processes delicate. [Differs from Clintonella in very fine ribs, high dorsal fold, and broader shell, from Anabaria by septatrypid shape, large and wide fold, very fine ribs, worn shells may be mistaken for Septatrypa.]