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Semiotoechia
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Pugnacoidea
Family:
Ladogiidae
Formal Genus Name and Reference:
Semiotoechia LJASCHENKO, 1973, p. 44
Type Species:
Camarotoechia polita LJASCHENKO, 1960, p. 9, OD
Images
(Click to enlarge in a new window)
Fig. 804, 2a-g. *S. polita (LJASCHENKO), lower Frasnian, between Kynovsk and Ust-laregsk beds, Ukhta River, mouth of the Yarega River, southern Timan, a-d, holotype, dorsal, anterior, posterior, and lateral views, x1, e-g, serial sections (Ljaschenko, 1973).
Synonyms
Geographic Distribution
Timan, Volga-Urals
Age Range
Beginning Stage in Treatise Usage:
Middle Devonian (upper Givetian)
Beginning International Stage:
Givetian
Fraction Up In Beginning Stage:
78
Beginning Date:
380.31
Ending Stage in Treatise Usage:
Upper Devonian (lower Frasnian)
Ending International Stage:
Frasnian
Fraction Up In Ending Stage:
33
Ending Date:
376.33
Description
Small with subpentagonal to transversely ovate outline and dorsibiconvex profile, anterior high because of strong fold, lateral flanks gently sloping, beak erect, fold and sulcus strong, extending from umbones, anterior commissure uniplicate, tongue wide, high, rounded, commonly forming highest part of shell, costae extending from umbones, weak and rounded on umbones and flanks, becoming moderately strong and subangular anteriorly on fold and sulcus, dental plates short, vertical, dorsal median septum low, short, septalium short, with cover plate, hinge plates undivided anterior of septalium
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Pugnacoidea
Family:
Ladogiidae
Formal Genus Name and Reference:
Semiotoechia LJASCHENKO, 1973, p. 44
Type Species:
Camarotoechia polita LJASCHENKO, 1960, p. 9, OD
Images
(Click to enlarge in a new window)
Fig. 804, 2a-g. *S. polita (LJASCHENKO), lower Frasnian, between Kynovsk and Ust-laregsk beds, Ukhta River, mouth of the Yarega River, southern Timan, a-d, holotype, dorsal, anterior, posterior, and lateral views, x1, e-g, serial sections (Ljaschenko, 1973).
Synonyms
Geographic Distribution
Timan, Volga-Urals
Age Range
Beginning Stage in Treatise Usage:
Middle Devonian (upper Givetian)
Beginning International Stage:
Givetian
Fraction Up In Beginning Stage:
78
Beginning Date:
380.31
Ending Stage in Treatise Usage:
Upper Devonian (lower Frasnian)
Ending International Stage:
Frasnian
Fraction Up In Ending Stage:
33
Ending Date:
376.33
Description
Small with subpentagonal to transversely ovate outline and dorsibiconvex profile, anterior high because of strong fold, lateral flanks gently sloping, beak erect, fold and sulcus strong, extending from umbones, anterior commissure uniplicate, tongue wide, high, rounded, commonly forming highest part of shell, costae extending from umbones, weak and rounded on umbones and flanks, becoming moderately strong and subangular anteriorly on fold and sulcus, dental plates short, vertical, dorsal median septum low, short, septalium short, with cover plate, hinge plates undivided anterior of septalium