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Triadithyris
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Terebratulida
Suborder:
Terebratulidina
Superfamily:
Loboidothyridoidea
Family:
Triadithyrididae
Formal Genus Name and Reference:
Triadithyris DAGYS, 1963, p. 187
Type Species:
* Terebratula gregariaeformis ZUGMAYER, 1880, p. 13, OD
Images
(Click to enlarge in a new window)
Fig. 1383, 4a-s. * T. gregariaeformis (Zugmayer), a-c, dorsal, lateral, and anterior views, X1.7, d-r, serial transverse sections 0.8, 1.6, 2.4, 2.5, 2.7, 3.0, 3.3, 3.6, 3.75, 4.05, 4.5, 5.25, 6.45, 6.6, 6.75 ~mm from ventral umbo, X1, s, loop reconstruction, X1 (Pearson, 1977).
Synonyms
Geographic Distribution
Alps, Balkans, Carpathians, Crimea, Caucasus, Pamir
Age Range
Beginning Stage in Treatise Usage:
Upper Triassic (Norian)
Beginning International Stage:
Norian
Fraction Up In Beginning Stage:
0
Beginning Date:
227.3
Ending Stage in Treatise Usage:
Upper Triassic (Rhaetian)
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Medium size, subpentagonal, ventribiconvex, anterior commissure sulciplicate, beak short, suberect, foramen permesothyrid, pedicle collar present, cardinal process large, bilobed, outer hinge plates narrow, horizontal in section, crural bases indistinct, loop about 0.5 dorsal valve length, with diverging, descending lamellae
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Terebratulida
Suborder:
Terebratulidina
Superfamily:
Loboidothyridoidea
Family:
Triadithyrididae
Formal Genus Name and Reference:
Triadithyris DAGYS, 1963, p. 187
Type Species:
* Terebratula gregariaeformis ZUGMAYER, 1880, p. 13, OD
Images
(Click to enlarge in a new window)
Fig. 1383, 4a-s. * T. gregariaeformis (Zugmayer), a-c, dorsal, lateral, and anterior views, X1.7, d-r, serial transverse sections 0.8, 1.6, 2.4, 2.5, 2.7, 3.0, 3.3, 3.6, 3.75, 4.05, 4.5, 5.25, 6.45, 6.6, 6.75 ~mm from ventral umbo, X1, s, loop reconstruction, X1 (Pearson, 1977).
Synonyms
Geographic Distribution
Alps, Balkans, Carpathians, Crimea, Caucasus, Pamir
Age Range
Beginning Stage in Treatise Usage:
Upper Triassic (Norian)
Beginning International Stage:
Norian
Fraction Up In Beginning Stage:
0
Beginning Date:
227.3
Ending Stage in Treatise Usage:
Upper Triassic (Rhaetian)
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Medium size, subpentagonal, ventribiconvex, anterior commissure sulciplicate, beak short, suberect, foramen permesothyrid, pedicle collar present, cardinal process large, bilobed, outer hinge plates narrow, horizontal in section, crural bases indistinct, loop about 0.5 dorsal valve length, with diverging, descending lamellae