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Thecocyrtelloidea
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferinida
Superfamily:
Suessioidea
Family:
Bittnerulidae
Formal Genus Name and Reference:
Thecocyrtelloidea YANG & XU , 1966, p. 58
Type Species:
T. tubulosa; OD
Images
(Click to enlarge in a new window)
Fig. 1256, 4a–g. *T. tubulosa; a–e, topotype, ventral, dorsal, anterior, posterior, and lateral views, ×4 (new); f–g, transverse sections, approximately ×3 (Yang & Xu, 1966).
Synonyms
Geographic Distribution
China (Guizhou)
Age Range
Beginning Stage in Treatise Usage:
Middle Triassic (Anisian)
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
Middle Triassic (Anisian)
Ending International Stage:
Anisian
Fraction Up In Ending Stage:
100
Ending Date:
241.46
Description
Small, ventribiconvex, ventral valve strongly subconical, dorsal weakly convex; ventral beak commonly asymmetrical; ventral interarea high, flattened, weakly convex or concave, catacline to procline; deltidium widely convex with numerous fine tubules; semicircular pedicle foramen seemingly present proximally; fold and sulcus narrow, very weakly developed; microornament unknown; ventral interior with long median septum; ventral adminicula possibly absent or very short; spondylium absent; dorsal interior with broad, bilobed ctenophoridium; jugum unknown.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferinida
Superfamily:
Suessioidea
Family:
Bittnerulidae
Formal Genus Name and Reference:
Thecocyrtelloidea YANG & XU , 1966, p. 58
Type Species:
T. tubulosa; OD
Images
(Click to enlarge in a new window)
Fig. 1256, 4a–g. *T. tubulosa; a–e, topotype, ventral, dorsal, anterior, posterior, and lateral views, ×4 (new); f–g, transverse sections, approximately ×3 (Yang & Xu, 1966).
Synonyms
Geographic Distribution
China (Guizhou)
Age Range
Beginning Stage in Treatise Usage:
Middle Triassic (Anisian)
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
Middle Triassic (Anisian)
Ending International Stage:
Anisian
Fraction Up In Ending Stage:
100
Ending Date:
241.46
Description
Small, ventribiconvex, ventral valve strongly subconical, dorsal weakly convex; ventral beak commonly asymmetrical; ventral interarea high, flattened, weakly convex or concave, catacline to procline; deltidium widely convex with numerous fine tubules; semicircular pedicle foramen seemingly present proximally; fold and sulcus narrow, very weakly developed; microornament unknown; ventral interior with long median septum; ventral adminicula possibly absent or very short; spondylium absent; dorsal interior with broad, bilobed ctenophoridium; jugum unknown.