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Eoantiptychia
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Zeillerioidea
Family:
Zeilieriidae
Formal Genus Name and Reference:
Eoantiptychia Xu & LIU, 1983b, p. 97
Type Species:
Antiptychia pentagona Yang & Yin in Yang & OTHERS, 1962, p. 122, OD
Images
(Click to enlarge in a new window)
Fig. 1442, 1a-e. *E. pentagona (Yang & Yin), South Dajialian Member, southern Qilian Mountains, dorsal, lateral, anterior, ventral, posterior views, × 1 (Xu & Liu, 1983b).
Synonyms
Geographic Distribution
China (Qinghai Province, Junzihe Formation)
Age Range
Beginning Stage in Treatise Usage:
Middle Triassic
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
Middle Triassic
Ending International Stage:
Ladinian
Fraction Up In Ending Stage:
100
Ending Date:
237
Description
Small, pentagonal in outline, unequally biconvex, anterior commissure unisulcate initially, becoming biplicate, umbo erect or slightly incurved, palintropes small, foramen mesothyrid, pedicle collar present, inner socket ridges well developed, hinge plates narrow, crural processes high, crural plates convex distally, giving septalium open V-shape posteriorly, becoming deep, truncated Vshape anteriorly, median septum broadly triangular in cross section, approximately 0.3 valve length, loop descending branches slender, ascending elements unknown
References
Museum or Author Information
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Zeillerioidea
Family:
Zeilieriidae
Formal Genus Name and Reference:
Eoantiptychia Xu & LIU, 1983b, p. 97
Type Species:
Antiptychia pentagona Yang & Yin in Yang & OTHERS, 1962, p. 122, OD
Images
(Click to enlarge in a new window)
Fig. 1442, 1a-e. *E. pentagona (Yang & Yin), South Dajialian Member, southern Qilian Mountains, dorsal, lateral, anterior, ventral, posterior views, × 1 (Xu & Liu, 1983b).
Synonyms
Geographic Distribution
China (Qinghai Province, Junzihe Formation)
Age Range
Beginning Stage in Treatise Usage:
Middle Triassic
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
Middle Triassic
Ending International Stage:
Ladinian
Fraction Up In Ending Stage:
100
Ending Date:
237
Description
Small, pentagonal in outline, unequally biconvex, anterior commissure unisulcate initially, becoming biplicate, umbo erect or slightly incurved, palintropes small, foramen mesothyrid, pedicle collar present, inner socket ridges well developed, hinge plates narrow, crural processes high, crural plates convex distally, giving septalium open V-shape posteriorly, becoming deep, truncated Vshape anteriorly, median septum broadly triangular in cross section, approximately 0.3 valve length, loop descending branches slender, ascending elements unknown