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Jonesea
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Plectambonitoidea
Family:
Xenambonitidae
Formal Genus Name and Reference:
Jonesea Cocks & RONG, 1989, p. 127
Type Species:
Leptaena grayi DAVIDSON, 1849, p. 271, OD
Images
(Click to enlarge in a new window)
Fig. 220a-d. *J. grayi (Davidson), a, latex cast of external molds of conjoined valves, lower Bringewood Beds, upper Ludlow, Ludlow, Shropshire, England, BMNH BC 10343, X12, b, c, dorsal internal mold, latex cast, lower Bringewood Beds, upper Ludlow, Ludlow, Shropshire, England, BMNH BC 10375, X12, d, upper Leintwardine Beds, Ludlow, Ludlow, Shropshire, England, ventral internal mold, BMNH BC 10340, X12 (Cocks & Rong, 1989).
Synonyms
Dionaegiria
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Ordovician (Ashgill)
Beginning International Stage:
Katian
Fraction Up In Beginning Stage:
66.7
Beginning Date:
447.72
Ending Stage in Treatise Usage:
Silurian (Ludlow)
Ending International Stage:
Ludfordian
Fraction Up In Ending Stage:
100
Ending Date:
422.73
Description
Gently concavoconvex profile, distinctive sharply crested parvicostellate ornament, vestigial dental plates, bilobed ventral muscle field, sometimes septules with pair of prominent tubercles posterolaterally inside ventral valve, similar to Chonetoidea, but with circular papillae rather than elongated, bema sometimes suggested by raised tubercles but not always developed.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Plectambonitoidea
Family:
Xenambonitidae
Formal Genus Name and Reference:
Jonesea Cocks & RONG, 1989, p. 127
Type Species:
Leptaena grayi DAVIDSON, 1849, p. 271, OD
Images
(Click to enlarge in a new window)
Fig. 220a-d. *J. grayi (Davidson), a, latex cast of external molds of conjoined valves, lower Bringewood Beds, upper Ludlow, Ludlow, Shropshire, England, BMNH BC 10343, X12, b, c, dorsal internal mold, latex cast, lower Bringewood Beds, upper Ludlow, Ludlow, Shropshire, England, BMNH BC 10375, X12, d, upper Leintwardine Beds, Ludlow, Ludlow, Shropshire, England, ventral internal mold, BMNH BC 10340, X12 (Cocks & Rong, 1989).
Synonyms
Dionaegiria
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Ordovician (Ashgill)
Beginning International Stage:
Katian
Fraction Up In Beginning Stage:
66.7
Beginning Date:
447.72
Ending Stage in Treatise Usage:
Silurian (Ludlow)
Ending International Stage:
Ludfordian
Fraction Up In Ending Stage:
100
Ending Date:
422.73
Description
Gently concavoconvex profile, distinctive sharply crested parvicostellate ornament, vestigial dental plates, bilobed ventral muscle field, sometimes septules with pair of prominent tubercles posterolaterally inside ventral valve, similar to Chonetoidea, but with circular papillae rather than elongated, bema sometimes suggested by raised tubercles but not always developed.