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Sowerbyella
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Plectambonitoidea
Family:
Sowerbyellidae
Formal Genus Name and Reference:
Sowerbyella JONES, 1928, p. 384
Type Species:
Leptaena sericea J. de C. SOWERBY, 1839, p. 636, OD
Images
(Click to enlarge in a new window)
Fig. 224,1a–d. *S. (S.) sericea (J. DE C. SOWERBY), Horderley Sandstone Formation, Longvillian, Onny Valley, Shropshire, England; a, ventral internal mold, BMNH BC 7302, ×3; b, latex cast of dorsal interior, BMNH BC 6052, ×5; c,d, posterior, oblique lateral views of latex cast of dorsal interior, BMNH BC 6051, × 4 (Cocks & Rong, 1989).——FIG. 224, 1e–h. S. (S.) liliifera, Kukruse Formation, lower Caradoc, Kohtla-Järve, Estonia; e, dorsal view of conjoined valves, BMNH BB 5147, × 5; f, ventral exterior, BMNH BB 5148, × 3; g, ventral interior, BMNH BB 5151, × 4; h, dorsal interior, BMNH BB 5149, ×5 (Cocks & Rong, 1989).
Synonyms
Sowerbyella
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Ordovician (Llanvirn)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
Ordovician (Ashgill)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Concavoconvex profile, parvicostellate to unequally parvicostellate ornament, small arched pseudodeltidium, no chilidium, short teeth, no denticles on hinge line, short but widely diverging dental plates, bilobed ventral muscle field open anteriorly, with posterolateral muscle-bounding ridges, thin short ventral median septum posteriorly, small cardinal process, wide flaring socket plates, bema variable, usually present but occasionally absent, median septum in dorsal valve variably developed, usually absent, similar to Anisopleurella but with prominent pair of central side septa, which sometimes form edge of bema and are sometimes developed above it.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Plectambonitoidea
Family:
Sowerbyellidae
Formal Genus Name and Reference:
Sowerbyella JONES, 1928, p. 384
Type Species:
Leptaena sericea J. de C. SOWERBY, 1839, p. 636, OD
Images
(Click to enlarge in a new window)
Fig. 224,1a–d. *S. (S.) sericea (J. DE C. SOWERBY), Horderley Sandstone Formation, Longvillian, Onny Valley, Shropshire, England; a, ventral internal mold, BMNH BC 7302, ×3; b, latex cast of dorsal interior, BMNH BC 6052, ×5; c,d, posterior, oblique lateral views of latex cast of dorsal interior, BMNH BC 6051, × 4 (Cocks & Rong, 1989).——FIG. 224, 1e–h. S. (S.) liliifera, Kukruse Formation, lower Caradoc, Kohtla-Järve, Estonia; e, dorsal view of conjoined valves, BMNH BB 5147, × 5; f, ventral exterior, BMNH BB 5148, × 3; g, ventral interior, BMNH BB 5151, × 4; h, dorsal interior, BMNH BB 5149, ×5 (Cocks & Rong, 1989).
Synonyms
Sowerbyella
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Ordovician (Llanvirn)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
Ordovician (Ashgill)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Concavoconvex profile, parvicostellate to unequally parvicostellate ornament, small arched pseudodeltidium, no chilidium, short teeth, no denticles on hinge line, short but widely diverging dental plates, bilobed ventral muscle field open anteriorly, with posterolateral muscle-bounding ridges, thin short ventral median septum posteriorly, small cardinal process, wide flaring socket plates, bema variable, usually present but occasionally absent, median septum in dorsal valve variably developed, usually absent, similar to Anisopleurella but with prominent pair of central side septa, which sometimes form edge of bema and are sometimes developed above it.