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Palaeochoristites
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Spiriferida
Suborder:
Spiriferina
Superfamily:
Theodossioidea
Family:
Palaeochoristitidae
Formal Genus Name and Reference:
Palaeochoristites SOKOLSKAYA, 1941, p. 26
Type Species:
Spirifer cinctus KEYSERLING, 1846, p. 229, OD
Images
(Click to enlarge in a new window)
Fig. 1128, 2a-f. *P. cinctus (Keyserling), European Russia, a-e, holotype, ventral, dorsal, lateral, anterior, and posterior views, X1 (new), f, transverse section, X3 (Ivanova, 1960).
Synonyms
Geographic Distribution
Russia
Age Range
Beginning Stage in Treatise Usage:
Carboniferous (Tournaisian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Carboniferous (Tournaisian)
Ending International Stage:
Tournaisian
Fraction Up In Ending Stage:
100
Ending Date:
346.73
Description
Medium to large, transversely subovate in outline, moderately and subequally biconvex, ventral umbonal region broad, evenly rounded, poorly differentiated from lateral slopes, beak small, incurved, ventral interarea acutely triangular, cardinal extremities rounded to subangular, maximum width attained anterior to hinge line, fold and sulcus absent, hinge line nondenticulate, entire surface multicostate, costae numerous, flattened, freely bifurcating or trifurcating, with narrow interspaces, ventral interior with long, slender, slightly diverging dental adminicula, dorsal interior with long, slender, subparallel, vertical dorsal adminicula, vascular impressions unknown, umbonal region of ventral valve greatly thickened
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Spiriferida
Suborder:
Spiriferina
Superfamily:
Theodossioidea
Family:
Palaeochoristitidae
Formal Genus Name and Reference:
Palaeochoristites SOKOLSKAYA, 1941, p. 26
Type Species:
Spirifer cinctus KEYSERLING, 1846, p. 229, OD
Images
(Click to enlarge in a new window)
Fig. 1128, 2a-f. *P. cinctus (Keyserling), European Russia, a-e, holotype, ventral, dorsal, lateral, anterior, and posterior views, X1 (new), f, transverse section, X3 (Ivanova, 1960).
Synonyms
Geographic Distribution
Russia
Age Range
Beginning Stage in Treatise Usage:
Carboniferous (Tournaisian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Carboniferous (Tournaisian)
Ending International Stage:
Tournaisian
Fraction Up In Ending Stage:
100
Ending Date:
346.73
Description
Medium to large, transversely subovate in outline, moderately and subequally biconvex, ventral umbonal region broad, evenly rounded, poorly differentiated from lateral slopes, beak small, incurved, ventral interarea acutely triangular, cardinal extremities rounded to subangular, maximum width attained anterior to hinge line, fold and sulcus absent, hinge line nondenticulate, entire surface multicostate, costae numerous, flattened, freely bifurcating or trifurcating, with narrow interspaces, ventral interior with long, slender, slightly diverging dental adminicula, dorsal interior with long, slender, subparallel, vertical dorsal adminicula, vascular impressions unknown, umbonal region of ventral valve greatly thickened