Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Semiplanus
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Productida
Superfamily:
Linoproductoidea
Family:
Monticuliferidae
Formal Genus Name and Reference:
Semiplanus Sarytcheva in Sarytcheva & SOKOLSKAYA, 1952, p. 119
Type Species:
Productus semiplanus Schwetsov, 1922, p. 10; OD
Images
(Click to enlarge in a new window)
Fig. 392, 1a–d. *S. semiplanus (SCHWETSOV), Asbian, Isle of Anglesey, north Wales; a, dorsal valve interior viewed posteriorly, ×1.5 (Sarytcheva & Legrand-Blain, 1977); b,c, ventral valve exterior viewed anteroventrally, posteroventrally, × 1; d, detail of ear showing ornament, spine bases, ×3 (new).——FIG. 392,1e. Semiplanus sp., Derbyshire; ventral valve exterior showing spine bases, ×1 (new).
Synonyms
Geographic Distribution
Eurasia
Age Range
Beginning Stage in Treatise Usage:
Lower Carboniferous (upper Viséan)
Beginning International Stage:
Visean
Fraction Up In Beginning Stage:
66
Beginning Date:
335.91
Ending Stage in Treatise Usage:
Lower Carboniferous (upper Viséan)
Ending International Stage:
Visean
Fraction Up In Ending Stage:
100
Ending Date:
330.34
Description
Resembles Semiplanus, but lacking dorsal spines and with somewhat thicker ventral spines, ribbing, cardinal process trifid with short middle lobe. Lower Carboniferous (Brigantian-lower Serpukhovian): Eurasia, northern, Resembles Semiplanus, but with thick-shelled valves and sessile cardinal process with strong but short median lobe, cardinal ridges obscure, spines fine, more common ventrally, brachial ridges well defined. Lower Carboniferous (upper Viséan): western Europe, ?central Asia, ?northern Africa.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Productida
Superfamily:
Linoproductoidea
Family:
Monticuliferidae
Formal Genus Name and Reference:
Semiplanus Sarytcheva in Sarytcheva & SOKOLSKAYA, 1952, p. 119
Type Species:
Productus semiplanus Schwetsov, 1922, p. 10; OD
Images
(Click to enlarge in a new window)
Fig. 392, 1a–d. *S. semiplanus (SCHWETSOV), Asbian, Isle of Anglesey, north Wales; a, dorsal valve interior viewed posteriorly, ×1.5 (Sarytcheva & Legrand-Blain, 1977); b,c, ventral valve exterior viewed anteroventrally, posteroventrally, × 1; d, detail of ear showing ornament, spine bases, ×3 (new).——FIG. 392,1e. Semiplanus sp., Derbyshire; ventral valve exterior showing spine bases, ×1 (new).
Synonyms
Geographic Distribution
Eurasia
Age Range
Beginning Stage in Treatise Usage:
Lower Carboniferous (upper Viséan)
Beginning International Stage:
Visean
Fraction Up In Beginning Stage:
66
Beginning Date:
335.91
Ending Stage in Treatise Usage:
Lower Carboniferous (upper Viséan)
Ending International Stage:
Visean
Fraction Up In Ending Stage:
100
Ending Date:
330.34
Description
Resembles Semiplanus, but lacking dorsal spines and with somewhat thicker ventral spines, ribbing, cardinal process trifid with short middle lobe. Lower Carboniferous (Brigantian-lower Serpukhovian): Eurasia, northern, Resembles Semiplanus, but with thick-shelled valves and sessile cardinal process with strong but short median lobe, cardinal ridges obscure, spines fine, more common ventrally, brachial ridges well defined. Lower Carboniferous (upper Viséan): western Europe, ?central Asia, ?northern Africa.