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Billingsella
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Billingsellidina
Superfamily:
Billingselloidea
Family:
Billingsellidae
Formal Genus Name and Reference:
Billingsella Hall & CLARKE, 1892, p. 230
Type Species:
Orthis pepina HALL, 1863c, p. 134, OD
Images
(Click to enlarge in a new window)
Fig. 498, 1a-f. B. perfecta Ulrich & Cooper, Upper Cambrian, $a$, ventral interior, Idaho-Wyoming border, $\\mathbf{X}_{\\mathbf{3}}$, $b$, details of ventral interarea, Idaho-Wyoming border, $\\mathbf{X}_{4}$, $c$, dorsal interior, Idaho-Wyoming border, $X_{3}$, $d, e$, ventral exterior, dorsal exterior, Idaho-Wyoming border, $X_{2}$ (Ulrich & Cooper, 1938), $f$, ventral interior, Wyoming, x2.5$ (Cocks, new)., ——Fig. 498, 1g. B. corrugata Ulrich & Cooper, Upper Cambrian, Oklahoma, dorsal interior, x2.5$ (Cocks, new).
Synonyms
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Middle Cambrian
Beginning International Stage:
Wuliuan
Fraction Up In Beginning Stage:
0
Beginning Date:
509
Ending Stage in Treatise Usage:
Lower Ordovician (Tremadoc)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Ventribiconvex to planoconvex, multicostellate with variably developed cardinal extremities, apical pedicle foramen, convex chilidium, and orthocline to apsacline ventral interarea, dental plates divergent, ventral muscle field with long, divergent diductor scars usually deeply impressed on tonguelike callus extending anteriorly, subperipheral rim occasionally developed
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Billingsellidina
Superfamily:
Billingselloidea
Family:
Billingsellidae
Formal Genus Name and Reference:
Billingsella Hall & CLARKE, 1892, p. 230
Type Species:
Orthis pepina HALL, 1863c, p. 134, OD
Images
(Click to enlarge in a new window)
Fig. 498, 1a-f. B. perfecta Ulrich & Cooper, Upper Cambrian, $a$, ventral interior, Idaho-Wyoming border, $\\mathbf{X}_{\\mathbf{3}}$, $b$, details of ventral interarea, Idaho-Wyoming border, $\\mathbf{X}_{4}$, $c$, dorsal interior, Idaho-Wyoming border, $X_{3}$, $d, e$, ventral exterior, dorsal exterior, Idaho-Wyoming border, $X_{2}$ (Ulrich & Cooper, 1938), $f$, ventral interior, Wyoming, x2.5$ (Cocks, new)., ——Fig. 498, 1g. B. corrugata Ulrich & Cooper, Upper Cambrian, Oklahoma, dorsal interior, x2.5$ (Cocks, new).
Synonyms
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Middle Cambrian
Beginning International Stage:
Wuliuan
Fraction Up In Beginning Stage:
0
Beginning Date:
509
Ending Stage in Treatise Usage:
Lower Ordovician (Tremadoc)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Ventribiconvex to planoconvex, multicostellate with variably developed cardinal extremities, apical pedicle foramen, convex chilidium, and orthocline to apsacline ventral interarea, dental plates divergent, ventral muscle field with long, divergent diductor scars usually deeply impressed on tonguelike callus extending anteriorly, subperipheral rim occasionally developed