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Tuvaella
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Anazygoidea
Family:
Anazygidae
Formal Genus Name and Reference:
Tuvaella CHERNYSHEV, 1937, p. 12
Type Species:
T. rackovskii, OD
Images
(Click to enlarge in a new window)
Fig. 978a-h. * T. rackovskii, upper Llandovery, Tuva, $a-d$, dorsal, ventral, lateral, posterior views, x2$, e-g, serial sections, x5$, h, reconstruction of brachidium, x2.5$ (Copper, 1977a).
Synonyms
Geographic Distribution
Tuva, Altai, Mongolia, Xinjiang, northeastern China
Age Range
Beginning Stage in Treatise Usage:
Silurian (upper Llandovery)
Beginning International Stage:
Telychian
Fraction Up In Beginning Stage:
0
Beginning Date:
438.59
Ending Stage in Treatise Usage:
Silurian (Ludlow, ?Přídolí)
Ending International Stage:
Pridoli
Fraction Up In Ending Stage:
100
Ending Date:
419
Description
Medium to large, long hinged, flat, ventribiconvex-planoconvex-dorsibiconvex, ventral valve carinate, dorsal sulcate, large, wide orthocline-anacline area, small, slitlike apical foramen, or foramen may be absent, prominent deltidial plates, continuous ribs expanding anteriorly, lacking raised, ventral midribs, distinct concentric growth filae, commissure sulcate, interior with solid, broad teeth, lacking accessory projections, hinge plate massive, cardinal pit absent, raised, but flat cardinal process, crura laterally directed, postero- to mediodorsally directed spiralia of fewer than 10 whorls, jugum dorsomedial, V-shaped, possessing ventrally directed crest. [Differs from other anazygids in large size, spiriferoid shape, solid teeth, V-shaped jugum.]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Anazygoidea
Family:
Anazygidae
Formal Genus Name and Reference:
Tuvaella CHERNYSHEV, 1937, p. 12
Type Species:
T. rackovskii, OD
Images
(Click to enlarge in a new window)
Fig. 978a-h. * T. rackovskii, upper Llandovery, Tuva, $a-d$, dorsal, ventral, lateral, posterior views, x2$, e-g, serial sections, x5$, h, reconstruction of brachidium, x2.5$ (Copper, 1977a).
Synonyms
Geographic Distribution
Tuva, Altai, Mongolia, Xinjiang, northeastern China
Age Range
Beginning Stage in Treatise Usage:
Silurian (upper Llandovery)
Beginning International Stage:
Telychian
Fraction Up In Beginning Stage:
0
Beginning Date:
438.59
Ending Stage in Treatise Usage:
Silurian (Ludlow, ?Přídolí)
Ending International Stage:
Pridoli
Fraction Up In Ending Stage:
100
Ending Date:
419
Description
Medium to large, long hinged, flat, ventribiconvex-planoconvex-dorsibiconvex, ventral valve carinate, dorsal sulcate, large, wide orthocline-anacline area, small, slitlike apical foramen, or foramen may be absent, prominent deltidial plates, continuous ribs expanding anteriorly, lacking raised, ventral midribs, distinct concentric growth filae, commissure sulcate, interior with solid, broad teeth, lacking accessory projections, hinge plate massive, cardinal pit absent, raised, but flat cardinal process, crura laterally directed, postero- to mediodorsally directed spiralia of fewer than 10 whorls, jugum dorsomedial, V-shaped, possessing ventrally directed crest. [Differs from other anazygids in large size, spiriferoid shape, solid teeth, V-shaped jugum.]