Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Stenoscisma
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Stenoscismatoidea
Family:
Stenoscismatidae
Formal Genus Name and Reference:
Stenoscisma CONRAD, 1839, p. 59, , non Stenocisma HALL, 1847, p. 142, nec Stenocisma CONRAD-HALL in HALL, 1867b, p. 334–335, nec Stenoschisma HALL & C LARKE , 1893, p. 187, nec Stenochisma SCHUCHERT, 1897, p. 413, nec Stenochisma GRABAU & SHIMER, 1907, p. 288
Type Species:
Terebratula schlottheimii von BUCH, 1834, p. 59-60, OD
Images
(Click to enlarge in a new window)
Fig. 829, 1a-n. *S. schlottheimii (von Buch), middle Upper Permian, Germany, $a$, dorsal valve exterior, $b$, lateral view, ventral valve on right, $c$, anterior view, ventral valve below, $d$, posterior view, ventral valve below, $e$, lateral interior, ventral valve on right, x2$ (Grant, 1965b), $f$ $n$, serial transverse sections, ventral valve below, x2.5$ (Weller, 1914)., Fig. 829, 1o-t. S. venustum (Girty), lower Permian, Leonard Formation, Texas, USA, $o$, dorsal valve exterior, $p$, ventral valve exterior, $q$, lateral interior, ventral valve below, x1.5$, $r$, dorsal valve interior, oblique, $s$, dorsal valve interior, $t$, ventral valve interior, x2$ (Grant, 1965a).
Synonyms
Camerophoria, Stenocisma, Stenoschisma
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Lower Carboniferous
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Upper Permian (Kazanian, ?Tatarian)
Ending International Stage:
Wuchiapingian
Fraction Up In Ending Stage:
40
Ending Date:
257.43
Description
Valves of medium size, may be large, costae rounded or sharp, on fold, flanks, or both, beginning near beaks or far in front of them, broad stolidium around anterior margins of adults, posterolateral edges of ventral valve flattened, strongly overlapped by edges of dorsal valve, beak long, varying from nearly straight to tightly incurved, deltidial plates conjunct or disjunct, foramen oval, open or completely closed, weak muscle marks in spondylium with adductors narrow, medial and diductors large, surrounding adductors, adjustors undifferentiated in apical part of spondylium, vascula genitalia deep, transverse, beginning at anterior edge of median septum, vascula media beginning as mesial pair near origin of gonocoels, bifurcating toward margins, extending onto stolidium, large, low, finely striated cardinal process, weak muscle marks in camarophorium with anterior adductors small, paired, medial and posterior adductors larger, lateral, mantle canals as in ventral valve
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Stenoscismatoidea
Family:
Stenoscismatidae
Formal Genus Name and Reference:
Stenoscisma CONRAD, 1839, p. 59, , non Stenocisma HALL, 1847, p. 142, nec Stenocisma CONRAD-HALL in HALL, 1867b, p. 334–335, nec Stenoschisma HALL & C LARKE , 1893, p. 187, nec Stenochisma SCHUCHERT, 1897, p. 413, nec Stenochisma GRABAU & SHIMER, 1907, p. 288
Type Species:
Terebratula schlottheimii von BUCH, 1834, p. 59-60, OD
Images
(Click to enlarge in a new window)
Fig. 829, 1a-n. *S. schlottheimii (von Buch), middle Upper Permian, Germany, $a$, dorsal valve exterior, $b$, lateral view, ventral valve on right, $c$, anterior view, ventral valve below, $d$, posterior view, ventral valve below, $e$, lateral interior, ventral valve on right, x2$ (Grant, 1965b), $f$ $n$, serial transverse sections, ventral valve below, x2.5$ (Weller, 1914)., Fig. 829, 1o-t. S. venustum (Girty), lower Permian, Leonard Formation, Texas, USA, $o$, dorsal valve exterior, $p$, ventral valve exterior, $q$, lateral interior, ventral valve below, x1.5$, $r$, dorsal valve interior, oblique, $s$, dorsal valve interior, $t$, ventral valve interior, x2$ (Grant, 1965a).
Synonyms
Camerophoria, Stenocisma, Stenoschisma
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Lower Carboniferous
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Upper Permian (Kazanian, ?Tatarian)
Ending International Stage:
Wuchiapingian
Fraction Up In Ending Stage:
40
Ending Date:
257.43
Description
Valves of medium size, may be large, costae rounded or sharp, on fold, flanks, or both, beginning near beaks or far in front of them, broad stolidium around anterior margins of adults, posterolateral edges of ventral valve flattened, strongly overlapped by edges of dorsal valve, beak long, varying from nearly straight to tightly incurved, deltidial plates conjunct or disjunct, foramen oval, open or completely closed, weak muscle marks in spondylium with adductors narrow, medial and diductors large, surrounding adductors, adjustors undifferentiated in apical part of spondylium, vascula genitalia deep, transverse, beginning at anterior edge of median septum, vascula media beginning as mesial pair near origin of gonocoels, bifurcating toward margins, extending onto stolidium, large, low, finely striated cardinal process, weak muscle marks in camarophorium with anterior adductors small, paired, medial and posterior adductors larger, lateral, mantle canals as in ventral valve