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Uncinunellina
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Wellerelloidea
Family:
Wellerellidae
Formal Genus Name and Reference:
Uncinunellina GRABAU, 1932a, p. 100
Type Species:
Uncinulus theobaldi WAAGEN, 1883, p. 425, OD
Images
(Click to enlarge in a new window)
Fig. 860, 2a-d. *U$. theobaldi (Waagen), Kungurian, Wargal Limestone, Kalabagh Member, Salt Range, Pakistan, a, topotype, dorsal view, x1, b-d$, topotype, ventral, anterior, and lateral views, x1.8$ (Grant, 1976). ——Fig. 860, 2e-h. U. hayasakai Yanagida & Nishikawa, Sakmarian, Yaikian, Kawai Limestone, Hiroshima, Kawai, Joge, Japan, paratype, serial sections, x3$ (Yanagida & Nishikawa, 1984).
Synonyms
Geographic Distribution
Pakistan, India, Thailand, China, Mongolia, Japan, Iran, Fergana, Pamir, Urals, Ukraine, Mexico.
Age Range
Beginning Stage in Treatise Usage:
Lower Permian (Sakmarian)
Beginning International Stage:
Sakmarian
Fraction Up In Beginning Stage:
0
Beginning Date:
293.52
Ending Stage in Treatise Usage:
Lower Permian (Tatarian)
Ending International Stage:
Wuchiapingian
Fraction Up In Ending Stage:
40
Ending Date:
257.43
Description
Transversely ovate outline and dorsibiconvex profile. Beak sharp, straight to suberect; foramen small; deltidial plates small, disjunct. Fold and sulcus low, wide, flat, arising at midlength; tongue wide, trapezoid. Umbones generally smooth. Costae low, simple, rounded, with narrow intertroughs, crests flattened and grooved on paries geniculatus; intertroughs extended at anterior and lateral margins to form spines that insert into holes near margin of opposite valve. Dental plates short, vertical to ventrally convergent; ventral muscle field weakly impressed. Dorsal median ridge low to absent; hinge plates thin, divided; crura ventrally curved.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Wellerelloidea
Family:
Wellerellidae
Formal Genus Name and Reference:
Uncinunellina GRABAU, 1932a, p. 100
Type Species:
Uncinulus theobaldi WAAGEN, 1883, p. 425, OD
Images
(Click to enlarge in a new window)
Fig. 860, 2a-d. *U$. theobaldi (Waagen), Kungurian, Wargal Limestone, Kalabagh Member, Salt Range, Pakistan, a, topotype, dorsal view, x1, b-d$, topotype, ventral, anterior, and lateral views, x1.8$ (Grant, 1976). ——Fig. 860, 2e-h. U. hayasakai Yanagida & Nishikawa, Sakmarian, Yaikian, Kawai Limestone, Hiroshima, Kawai, Joge, Japan, paratype, serial sections, x3$ (Yanagida & Nishikawa, 1984).
Synonyms
Geographic Distribution
Pakistan, India, Thailand, China, Mongolia, Japan, Iran, Fergana, Pamir, Urals, Ukraine, Mexico.
Age Range
Beginning Stage in Treatise Usage:
Lower Permian (Sakmarian)
Beginning International Stage:
Sakmarian
Fraction Up In Beginning Stage:
0
Beginning Date:
293.52
Ending Stage in Treatise Usage:
Lower Permian (Tatarian)
Ending International Stage:
Wuchiapingian
Fraction Up In Ending Stage:
40
Ending Date:
257.43
Description
Transversely ovate outline and dorsibiconvex profile. Beak sharp, straight to suberect; foramen small; deltidial plates small, disjunct. Fold and sulcus low, wide, flat, arising at midlength; tongue wide, trapezoid. Umbones generally smooth. Costae low, simple, rounded, with narrow intertroughs, crests flattened and grooved on paries geniculatus; intertroughs extended at anterior and lateral margins to form spines that insert into holes near margin of opposite valve. Dental plates short, vertical to ventrally convergent; ventral muscle field weakly impressed. Dorsal median ridge low to absent; hinge plates thin, divided; crura ventrally curved.