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Yakovlevia
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Productida
Superfamily:
Productoidea
Family:
Productellidae
Formal Genus Name and Reference:
Yakovlevia Fredericks, 1925, p. 7
Type Species:
Y. kaluzinensis, OD
Images
(Click to enlarge in a new window)
Fig. 310, 1a. *Y. kaluzinensis, upper Lower Permian, eastern Siberia, ventral valve internal mold, x0.7$ (Wiman, 1914), FIG. 310, 1b, c. Y. mammata (Keyserling), Lower Permian, northern Russia, ventral valve viewed ventrally, anteriorly, X1 (Licharew, 1947), Fig. 310, 1d, e. Y. multistriata (Meek), Lower Permian, Texas, $d$, ventral valve exterior, x1, e$, dorsal valve interior, x2$ (Licharew, 1947)
Synonyms
Muirwoodia
Geographic Distribution
Siberia, Arctic regions, Mongolia, China, Japan, USA
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:
Upper Permian (Kazanian)
Ending International Stage:
Roadian
Fraction Up In Ending Stage:
100
Ending Date:
269.21
Description
Medium to large, outline pentagonal to subquadrate, ventral profile with flattened disk, strong geniculation, long trail, corpus cavity shallow, commonly median sulcus, starting posteriorly on disk, ribbing fine, weak, spines in rows of increasing size near hinge, plus few others, commonly four symmetrically placed, muscle fields strongly impressed, cardinal process sessile, broad, lateral ridges close to hinge, strongly angled separating small ears, anterior disk thickened or with endospines.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Productida
Superfamily:
Productoidea
Family:
Productellidae
Formal Genus Name and Reference:
Yakovlevia Fredericks, 1925, p. 7
Type Species:
Y. kaluzinensis, OD
Images
(Click to enlarge in a new window)
Fig. 310, 1a. *Y. kaluzinensis, upper Lower Permian, eastern Siberia, ventral valve internal mold, x0.7$ (Wiman, 1914), FIG. 310, 1b, c. Y. mammata (Keyserling), Lower Permian, northern Russia, ventral valve viewed ventrally, anteriorly, X1 (Licharew, 1947), Fig. 310, 1d, e. Y. multistriata (Meek), Lower Permian, Texas, $d$, ventral valve exterior, x1, e$, dorsal valve interior, x2$ (Licharew, 1947)
Synonyms
Muirwoodia
Geographic Distribution
Siberia, Arctic regions, Mongolia, China, Japan, USA
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:
Upper Permian (Kazanian)
Ending International Stage:
Roadian
Fraction Up In Ending Stage:
100
Ending Date:
269.21
Description
Medium to large, outline pentagonal to subquadrate, ventral profile with flattened disk, strong geniculation, long trail, corpus cavity shallow, commonly median sulcus, starting posteriorly on disk, ribbing fine, weak, spines in rows of increasing size near hinge, plus few others, commonly four symmetrically placed, muscle fields strongly impressed, cardinal process sessile, broad, lateral ridges close to hinge, strongly angled separating small ears, anterior disk thickened or with endospines.