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Yunnanella
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Pugnacoidea
Family:
Yunnanellidae
Formal Genus Name and Reference:
Yunnanella GRABAU, 1923 in 1923-1924, p. 195
Type Species:
Rhynchonella Hanburii DAVIDSON, 1853a, p. 356, OD
Images
(Click to enlarge in a new window)
Fig. 814a-n. * Y. hanburii (Davidson), Kwangsi, a-d, lectotype, dorsal, ventral, anterior, and lateral views, × 1.5, e, paralectotype, dorsal view showing striae, × 2, f-n, serial sections 0.95, 1.1, 1.25, 1.4, 1.5, 2.0, 2.25, 3.3, 3.65 mm from posterior, × 2 (Sartenaer, 1971b).
Synonyms
Geographic Distribution
China
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 Devonian (Famennian)
Ending International Stage:
Famennian
Fraction Up In Ending Stage:
100
Ending Date:
359.3
Description
Subpentagonal outline and dorsibiconvex profile, anteriorly inflated. Beak suberect to erect, foramen small, semicircular, bounded by deltidial plates. Fold and sulcus strong from umbones and particularly pronounced anteriorly, anterior commissure uniplicate, tongue high, typically tridentate. Costae angular, originating at about midlength, entire surface bearing radial striae. Dental plates strong, ventrally convergent. Dorsal median septum strong, short, septalium narrow, short, V-shaped, open, hinge plates dividing immediately anterior of septalium, horizontal, crura long, slender, tips concave ventrally in cross section.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Pugnacoidea
Family:
Yunnanellidae
Formal Genus Name and Reference:
Yunnanella GRABAU, 1923 in 1923-1924, p. 195
Type Species:
Rhynchonella Hanburii DAVIDSON, 1853a, p. 356, OD
Images
(Click to enlarge in a new window)
Fig. 814a-n. * Y. hanburii (Davidson), Kwangsi, a-d, lectotype, dorsal, ventral, anterior, and lateral views, × 1.5, e, paralectotype, dorsal view showing striae, × 2, f-n, serial sections 0.95, 1.1, 1.25, 1.4, 1.5, 2.0, 2.25, 3.3, 3.65 mm from posterior, × 2 (Sartenaer, 1971b).
Synonyms
Geographic Distribution
China
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 Devonian (Famennian)
Ending International Stage:
Famennian
Fraction Up In Ending Stage:
100
Ending Date:
359.3
Description
Subpentagonal outline and dorsibiconvex profile, anteriorly inflated. Beak suberect to erect, foramen small, semicircular, bounded by deltidial plates. Fold and sulcus strong from umbones and particularly pronounced anteriorly, anterior commissure uniplicate, tongue high, typically tridentate. Costae angular, originating at about midlength, entire surface bearing radial striae. Dental plates strong, ventrally convergent. Dorsal median septum strong, short, septalium narrow, short, V-shaped, open, hinge plates dividing immediately anterior of septalium, horizontal, crura long, slender, tips concave ventrally in cross section.