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Parathyridina
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Zeillerioidea
Family:
Zeilieriidae
Formal Genus Name and Reference:
Parathyridina Schuchert & LeVene, 1929b, p. 121, nom. nov. pro Parathyris Douvillé, 1916, p. 35, non HÜBNER, 1816
Type Species:
Parathyris plicatoides DOUVILLÉ, 1916, p. 36, OD
Images
(Click to enlarge in a new window)
Fig. 1443, 2a-b. *P. plicatoides (Douvillé), Egypt, dorsal, anterior views, X1 (Muir-Wood, 1965a).
Synonyms
Geographic Distribution
Egypt, Sinai Peninsula
Age Range
Beginning Stage in Treatise Usage:
Middle Jurassic (Bajocian)
Beginning International Stage:
Bajocian
Fraction Up In Beginning Stage:
0
Beginning Date:
170.9
Ending Stage in Treatise Usage:
Middle Jurassic (Bajocian)
Ending International Stage:
Bajocian
Fraction Up In Ending Stage:
100
Ending Date:
168.17
Description
Small to medium size, shell equally biconvex to globose without prominent fold or sulcus, anterior commissure uniplicate with superimposed, alternating costation, costae few, broad, near anterior margin only, umbo short, suberect, with obscure beak ridges, foramen possibly permesothyrid, symphytium narrow, median septum prominent, clearly visible on partially worn shells, other internal characters unknown
References
Museum or Author Information
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Zeillerioidea
Family:
Zeilieriidae
Formal Genus Name and Reference:
Parathyridina Schuchert & LeVene, 1929b, p. 121, nom. nov. pro Parathyris Douvillé, 1916, p. 35, non HÜBNER, 1816
Type Species:
Parathyris plicatoides DOUVILLÉ, 1916, p. 36, OD
Images
(Click to enlarge in a new window)
Fig. 1443, 2a-b. *P. plicatoides (Douvillé), Egypt, dorsal, anterior views, X1 (Muir-Wood, 1965a).
Synonyms
Geographic Distribution
Egypt, Sinai Peninsula
Age Range
Beginning Stage in Treatise Usage:
Middle Jurassic (Bajocian)
Beginning International Stage:
Bajocian
Fraction Up In Beginning Stage:
0
Beginning Date:
170.9
Ending Stage in Treatise Usage:
Middle Jurassic (Bajocian)
Ending International Stage:
Bajocian
Fraction Up In Ending Stage:
100
Ending Date:
168.17
Description
Small to medium size, shell equally biconvex to globose without prominent fold or sulcus, anterior commissure uniplicate with superimposed, alternating costation, costae few, broad, near anterior margin only, umbo short, suberect, with obscure beak ridges, foramen possibly permesothyrid, symphytium narrow, median septum prominent, clearly visible on partially worn shells, other internal characters unknown