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Palaeostrophia
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Porambonitoidea
Family:
Tetralobulidae
Formal Genus Name and Reference:
Palaeostrophia Ulrich & COOPER, 1936, p. 627
Type Species:
Syntrophia orthia WALCOTT, 1906, p. 11, OD
Images
(Click to enlarge in a new window)
Fig. 629, 5a-b. *P. orthia (Walcott), upper Franconian-lower Trempealeauan, Chaumitien Limestone, Tsinan, China, a, dorsal valve exterior, × 2, b, dorsal valve interior, × 3 (Ulrich & Cooper, 1938).——Fig. 629, 5c-j. P. sp., upper Franconian-lower Trempealeauan, Wilburns Formation, Texas, USA, c, ventral valve exterior, d, ventral valve exterior, lateral view, e, ventral valve, posterior view, f, dorsal valve exterior, g, dorsal valve exterior, lateral view, h, dorsal valve exterior, posterior view, i, ventral valve interior, j, dorsal valve interior, USNM Biologic Collection, × 2 (new).
Synonyms
Geographic Distribution
USA, Canada, Norway, Russia, Kazakhstan, China, South Korea
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian (Franconian)
Beginning International Stage:
Paibian
Fraction Up In Beginning Stage:
73.3
Beginning Date:
494.95
Ending Stage in Treatise Usage:
Lower Ordovician (lower Llanvirn)
Ending International Stage:
Dapingian
Fraction Up In Ending Stage:
100
Ending Date:
469.42
Description
Smooth, moderately biconvex shells, uniplication very deep and rounded, reverts from gentle unisulcation early in ontogeny in some individuals, type species with medium hinge line, others narrow to medium in width, teeth strong, sessile spondylium narrow, supported at anterior only by short, low, wide median ridge not prolonged anterior to spondylium, shallow notothyrial cavity, socket plates narrow, very short, delicate, may have thickened callus of shell in between, dorsal adductor muscle field elongate oval in outline
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Porambonitoidea
Family:
Tetralobulidae
Formal Genus Name and Reference:
Palaeostrophia Ulrich & COOPER, 1936, p. 627
Type Species:
Syntrophia orthia WALCOTT, 1906, p. 11, OD
Images
(Click to enlarge in a new window)
Fig. 629, 5a-b. *P. orthia (Walcott), upper Franconian-lower Trempealeauan, Chaumitien Limestone, Tsinan, China, a, dorsal valve exterior, × 2, b, dorsal valve interior, × 3 (Ulrich & Cooper, 1938).——Fig. 629, 5c-j. P. sp., upper Franconian-lower Trempealeauan, Wilburns Formation, Texas, USA, c, ventral valve exterior, d, ventral valve exterior, lateral view, e, ventral valve, posterior view, f, dorsal valve exterior, g, dorsal valve exterior, lateral view, h, dorsal valve exterior, posterior view, i, ventral valve interior, j, dorsal valve interior, USNM Biologic Collection, × 2 (new).
Synonyms
Geographic Distribution
USA, Canada, Norway, Russia, Kazakhstan, China, South Korea
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian (Franconian)
Beginning International Stage:
Paibian
Fraction Up In Beginning Stage:
73.3
Beginning Date:
494.95
Ending Stage in Treatise Usage:
Lower Ordovician (lower Llanvirn)
Ending International Stage:
Dapingian
Fraction Up In Ending Stage:
100
Ending Date:
469.42
Description
Smooth, moderately biconvex shells, uniplication very deep and rounded, reverts from gentle unisulcation early in ontogeny in some individuals, type species with medium hinge line, others narrow to medium in width, teeth strong, sessile spondylium narrow, supported at anterior only by short, low, wide median ridge not prolonged anterior to spondylium, shallow notothyrial cavity, socket plates narrow, very short, delicate, may have thickened callus of shell in between, dorsal adductor muscle field elongate oval in outline