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Rhaetina
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Dielasmatoidea
Family:
Angustothyrididae
Formal Genus Name and Reference:
Rhaetina WAAGEN, 1882, p. 334
Type Species:
Terebratula gregaria SUESS, 1854, p. 42, OD
Images
(Click to enlarge in a new window)
Fig. 1355, 1a-n. * R. gregaria (Suess), Rhaetian, eastern Alps, a-c, dorsal, anterior, and posterior views, X1, d-n, serial transverse sections 3.35, 3.5, 3.8, 4.9, 5.5, 6.5, 6.9, 8.1, 8.9, 9.3, 9.5 mm from ventral umbo, X2 (Pearson, 1977).
Synonyms
Rhaetinopsis, Sanqiaothyris
Geographic Distribution
North America (Idaho), Alps, Balkans, Carpathians, Crimea, northwestern Caucasus, Iran, Afghanistan, Vietnam, China, USA (Nevada), northern Alps
Age Range
Beginning Stage in Treatise Usage:
Lower Triassic, Upper Triassic, ?Lower Jurassic
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
Upper Triassic, ?Lower Jurassic
Ending International Stage:
Toarcian
Fraction Up In Ending Stage:
100
Ending Date:
174.7
Description
Medium to large in size, smooth to biplicate, anterior commissure rectimarginate to sulciplicate, beak short, suberect, beak ridges rounded, foramen permesothyrid, cardinal process low, outer hinge plates inclined, crural plates usually connected to floor of dorsal valve without forming septalium, septum low or absent, loop short, arched (about 0.3 dorsal valve length), with moderately arched transverse band.
References
Museum or Author Information
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Dielasmatoidea
Family:
Angustothyrididae
Formal Genus Name and Reference:
Rhaetina WAAGEN, 1882, p. 334
Type Species:
Terebratula gregaria SUESS, 1854, p. 42, OD
Images
(Click to enlarge in a new window)
Fig. 1355, 1a-n. * R. gregaria (Suess), Rhaetian, eastern Alps, a-c, dorsal, anterior, and posterior views, X1, d-n, serial transverse sections 3.35, 3.5, 3.8, 4.9, 5.5, 6.5, 6.9, 8.1, 8.9, 9.3, 9.5 mm from ventral umbo, X2 (Pearson, 1977).
Synonyms
Rhaetinopsis, Sanqiaothyris
Geographic Distribution
North America (Idaho), Alps, Balkans, Carpathians, Crimea, northwestern Caucasus, Iran, Afghanistan, Vietnam, China, USA (Nevada), northern Alps
Age Range
Beginning Stage in Treatise Usage:
Lower Triassic, Upper Triassic, ?Lower Jurassic
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
Upper Triassic, ?Lower Jurassic
Ending International Stage:
Toarcian
Fraction Up In Ending Stage:
100
Ending Date:
174.7
Description
Medium to large in size, smooth to biplicate, anterior commissure rectimarginate to sulciplicate, beak short, suberect, beak ridges rounded, foramen permesothyrid, cardinal process low, outer hinge plates inclined, crural plates usually connected to floor of dorsal valve without forming septalium, septum low or absent, loop short, arched (about 0.3 dorsal valve length), with moderately arched transverse band.