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Brachythyrina
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Spiriferoidea
Family:
Choristitidae
Formal Genus Name and Reference:
Brachythyrina FREDERIKS, 1929, p. 385
Type Species:
Spirifer strangwaysi de VERNEUIL, 1845, p. 164, OD
Images
(Click to enlarge in a new window)
Fig. 1177, 3ac. * B. strangwaysi (de Verneuil), Pennsylvanian, Moscow basin, ventral, dorsal, and posterior views, X1 (Sarycheva & Sokolskaya, 1952).
Synonyms
Anelasmina
Geographic Distribution
Europe, Asia
Age Range
Beginning Stage in Treatise Usage:
Carboniferous (Mississippian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Small to medium size, outline usually transverse, cardinal extremities well rounded in juveniles, becoming angular to alate or mucronate in adults, fold and sulcus moderately narrow, well delineated, lateral slopes with moderately numerous, flattened, simple costae, bifurcations rare, interspaces moderately narrow, subangular, sulcus usually with about 5 simple costae, median rib very rarely bifurcating, ribs adjacent to fold-sulcus bifurcating in umbonal region of both valves, microornament finely and regularly cancellate, dental adminicula absent, vascular impressions ramiform
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Spiriferoidea
Family:
Choristitidae
Formal Genus Name and Reference:
Brachythyrina FREDERIKS, 1929, p. 385
Type Species:
Spirifer strangwaysi de VERNEUIL, 1845, p. 164, OD
Images
(Click to enlarge in a new window)
Fig. 1177, 3ac. * B. strangwaysi (de Verneuil), Pennsylvanian, Moscow basin, ventral, dorsal, and posterior views, X1 (Sarycheva & Sokolskaya, 1952).
Synonyms
Anelasmina
Geographic Distribution
Europe, Asia
Age Range
Beginning Stage in Treatise Usage:
Carboniferous (Mississippian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Small to medium size, outline usually transverse, cardinal extremities well rounded in juveniles, becoming angular to alate or mucronate in adults, fold and sulcus moderately narrow, well delineated, lateral slopes with moderately numerous, flattened, simple costae, bifurcations rare, interspaces moderately narrow, subangular, sulcus usually with about 5 simple costae, median rib very rarely bifurcating, ribs adjacent to fold-sulcus bifurcating in umbonal region of both valves, microornament finely and regularly cancellate, dental adminicula absent, vascular impressions ramiform