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Aequspiriferina
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferinida
Superfamily:
Pennospiriferinoidea
Family:
Balatonospiridae
Formal Genus Name and Reference:
Aequspiriferina Yang & Yin in Yang & OTHERS, 1962, p. 109
Type Species:
* A. multiplicata, OD
Images
(Click to enlarge in a new window)
Fig. 1280, 3ag. *A. multiplicata, a-e, ventral, dorsal, anterior, posterior, and lateral views, X2 (new), f-g, transverse sections, approximately X1.3 ( Xu & Liu, 1983b).
Synonyms
Geographic Distribution
China
Age Range
Beginning Stage in Treatise Usage:
Middle Triassic, ?Upper Triassic
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
Middle Triassic, ?Upper Triassic
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Small to medium size, strongly ventribiconvex, transversely subovate to subquadrate in outline, ventral beak incurved, hinge line equal to maximum width, cardinal extremities subangular to acute, ventral interarea distinct, slightly concave, catacline to slightly apsacline, fold and sulcus weakly to moderately developed, entire surfaces of both valves with numerous broadly rounded costae, microornament unknown, dental adminicula discrete, ventral median septum thickened, high distally, very short dorsal median septum, jugum unknown
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferinida
Superfamily:
Pennospiriferinoidea
Family:
Balatonospiridae
Formal Genus Name and Reference:
Aequspiriferina Yang & Yin in Yang & OTHERS, 1962, p. 109
Type Species:
* A. multiplicata, OD
Images
(Click to enlarge in a new window)
Fig. 1280, 3ag. *A. multiplicata, a-e, ventral, dorsal, anterior, posterior, and lateral views, X2 (new), f-g, transverse sections, approximately X1.3 ( Xu & Liu, 1983b).
Synonyms
Geographic Distribution
China
Age Range
Beginning Stage in Treatise Usage:
Middle Triassic, ?Upper Triassic
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
Middle Triassic, ?Upper Triassic
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Small to medium size, strongly ventribiconvex, transversely subovate to subquadrate in outline, ventral beak incurved, hinge line equal to maximum width, cardinal extremities subangular to acute, ventral interarea distinct, slightly concave, catacline to slightly apsacline, fold and sulcus weakly to moderately developed, entire surfaces of both valves with numerous broadly rounded costae, microornament unknown, dental adminicula discrete, ventral median septum thickened, high distally, very short dorsal median septum, jugum unknown