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Araxathyris
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Athyridida
Superfamily:
Athyridoidea
Family:
Athyrididae
Formal Genus Name and Reference:
Araxathyris GRUNT, 1965, p. 240
Type Species:
Spirigera protea ABICH, 1878, p. 55, OD
Images
(Click to enlarge in a new window)
Fig. 1044 a-c . *A. protea (Abich), Transcaucasus, lectotype, dorsal, ventral, and anterior views, LGI 66/99, x1$ (Grunt, 1965)., FIG. $1044 d-p$. A. felina (Arthaber), Transcaucasus, transverse serial sections, 6.7, 6.9, 7.2, 7.7, 8.2, 8.9, $9.7, 10.6, 11.8, 12.2, 12.9, 13.4, 17.5 \\mathrm{~mm}$ from ventral umbo, PIN 2073/547 (adapted from Grunt, 1965)., Fig. 1044 q-x. A. abichi (Arthaber), Transcaucasus, tangential serial sections, parallel to commissural plane, 3.1, 4.8, 5.7, 6.5, 7.0, 7.3, 8.1, 8.7 mm from dorsal valve, PIN 3599/833 (adapted from Grunt, 1986).
Synonyms
Geographic Distribution
southern Alps, Transcaucasus, Iran, southern China (Sichuan, Shaanxi), northwestern China (Qinghai), Thailand
Age Range
Beginning Stage in Treatise Usage:
Lower Permian, Upper Permian
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
Lower Permian, Upper Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
"Medium to large, moderately to strongly biconvex, transversely oval to subpentagonal, inflated shells, ventral sulcus and dorsal fold wide and flat anteriorly, bearing distinct median groove starting at apex, 2 poorly developed lateral plications may bound sulcus, anterior commissure para- to bisulcate, growth laminae widely and irregularly spaced, short, thin, medially concave dental plates forming narrow sessile spondylium, cardinal plate thin, narrow, subtriangular, apically perforated by small foramen, cardinal flanges well developed, tertiary layer present."
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Athyridida
Superfamily:
Athyridoidea
Family:
Athyrididae
Formal Genus Name and Reference:
Araxathyris GRUNT, 1965, p. 240
Type Species:
Spirigera protea ABICH, 1878, p. 55, OD
Images
(Click to enlarge in a new window)
Fig. 1044 a-c . *A. protea (Abich), Transcaucasus, lectotype, dorsal, ventral, and anterior views, LGI 66/99, x1$ (Grunt, 1965)., FIG. $1044 d-p$. A. felina (Arthaber), Transcaucasus, transverse serial sections, 6.7, 6.9, 7.2, 7.7, 8.2, 8.9, $9.7, 10.6, 11.8, 12.2, 12.9, 13.4, 17.5 \\mathrm{~mm}$ from ventral umbo, PIN 2073/547 (adapted from Grunt, 1965)., Fig. 1044 q-x. A. abichi (Arthaber), Transcaucasus, tangential serial sections, parallel to commissural plane, 3.1, 4.8, 5.7, 6.5, 7.0, 7.3, 8.1, 8.7 mm from dorsal valve, PIN 3599/833 (adapted from Grunt, 1986).
Synonyms
Geographic Distribution
southern Alps, Transcaucasus, Iran, southern China (Sichuan, Shaanxi), northwestern China (Qinghai), Thailand
Age Range
Beginning Stage in Treatise Usage:
Lower Permian, Upper Permian
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
Lower Permian, Upper Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
"Medium to large, moderately to strongly biconvex, transversely oval to subpentagonal, inflated shells, ventral sulcus and dorsal fold wide and flat anteriorly, bearing distinct median groove starting at apex, 2 poorly developed lateral plications may bound sulcus, anterior commissure para- to bisulcate, growth laminae widely and irregularly spaced, short, thin, medially concave dental plates forming narrow sessile spondylium, cardinal plate thin, narrow, subtriangular, apically perforated by small foramen, cardinal flanges well developed, tertiary layer present."