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Trigonotreta
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Spiriferoidea
Family:
Trigonotretidae
Formal Genus Name and Reference:
Trigonotreta KÖNIG, 1825, p. 3
Type Species:
T. stokesi, SD Hall & CLARKE, 1893, p. 8
Images
(Click to enlarge in a new window)
Fig. 1195, 2a-e. *T. stokesi, Tamarian, Tasmania, a, ventral valve, b-c, lectotype, dorsal and lateral views, d-e, ventral interior, dorsal interior, X1 (Clarke, 1979).
Synonyms
Grantonia
Geographic Distribution
Australia
Age Range
Beginning Stage in Treatise Usage:
Permian (?Asselian-?Kungurian)
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
Permian (?Asselian-?Kungurian)
Ending International Stage:
Kungurian
Fraction Up In Ending Stage:
100
Ending Date:
274.37
Description
Medium to large, thick shelled, moderately to strongly transverse, cardinal extremities highly variable, maximum width variable, fold and sulcus moderately developed, lateral slopes strongly plicate with 3 to 5 fasciculate, unequal costae per plica, variably lamellose, ventral interior much thickened by callus, delthyrium occluded by bulbous callus, dental adminicula buried in callus in adults, muscle field deeply incised.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Spiriferoidea
Family:
Trigonotretidae
Formal Genus Name and Reference:
Trigonotreta KÖNIG, 1825, p. 3
Type Species:
T. stokesi, SD Hall & CLARKE, 1893, p. 8
Images
(Click to enlarge in a new window)
Fig. 1195, 2a-e. *T. stokesi, Tamarian, Tasmania, a, ventral valve, b-c, lectotype, dorsal and lateral views, d-e, ventral interior, dorsal interior, X1 (Clarke, 1979).
Synonyms
Grantonia
Geographic Distribution
Australia
Age Range
Beginning Stage in Treatise Usage:
Permian (?Asselian-?Kungurian)
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
Permian (?Asselian-?Kungurian)
Ending International Stage:
Kungurian
Fraction Up In Ending Stage:
100
Ending Date:
274.37
Description
Medium to large, thick shelled, moderately to strongly transverse, cardinal extremities highly variable, maximum width variable, fold and sulcus moderately developed, lateral slopes strongly plicate with 3 to 5 fasciculate, unequal costae per plica, variably lamellose, ventral interior much thickened by callus, delthyrium occluded by bulbous callus, dental adminicula buried in callus in adults, muscle field deeply incised.