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Chonetoidea
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Plectambonitoidea
Family:
Xenambonitidae
Formal Genus Name and Reference:
Chonetoidea JONES, 1928, p. 393
Type Species:
Plectambonites papillosa REED, 1905, p. 451, OD
Images
(Click to enlarge in a new window)
Fig. 218, 2a, b. *C. papillosa (Reed), Slade, Redhill Mudstone Formation, middle Ashgill, Upper Slade, near Haverfordwest, Dyfed, Wales, $a$, internal mold of conjoined valves, SM A11313, X4, $b$, lectotype, dorsal internal mold, SM A11311, X10 (Cocks & Rong, 1989)., Fig. 218, 2c, d. C. senta, Králuv Dvur shales, lower-middle Ashgill, Králuv Dvur, Czech Republic, holotype, ventral, dorsal internal molds, OMR VH 276, X4 (Havlíček, 1967).
Synonyms
Sericoidea, ?Sentolunia
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Ordovician (Llandeilo)
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
56.9
Beginning Date:
463.02
Ending Stage in Treatise Usage:
Ordovician (Ashgill)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Gently concavoconvex profile, parvicostellate ornament, sometimes with unequal parvicostellae, small interarea, small arched pseudodeltidium, no chilidium, widely divergent teeth, socket plates, bilobed but weakly impressed ventral muscle field, similar to Jonesea, but with elongated septules, rather than circular papillae, bema sometimes present, sometimes delineated only by larger septules.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Plectambonitoidea
Family:
Xenambonitidae
Formal Genus Name and Reference:
Chonetoidea JONES, 1928, p. 393
Type Species:
Plectambonites papillosa REED, 1905, p. 451, OD
Images
(Click to enlarge in a new window)
Fig. 218, 2a, b. *C. papillosa (Reed), Slade, Redhill Mudstone Formation, middle Ashgill, Upper Slade, near Haverfordwest, Dyfed, Wales, $a$, internal mold of conjoined valves, SM A11313, X4, $b$, lectotype, dorsal internal mold, SM A11311, X10 (Cocks & Rong, 1989)., Fig. 218, 2c, d. C. senta, Králuv Dvur shales, lower-middle Ashgill, Králuv Dvur, Czech Republic, holotype, ventral, dorsal internal molds, OMR VH 276, X4 (Havlíček, 1967).
Synonyms
Sericoidea, ?Sentolunia
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Ordovician (Llandeilo)
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
56.9
Beginning Date:
463.02
Ending Stage in Treatise Usage:
Ordovician (Ashgill)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Gently concavoconvex profile, parvicostellate ornament, sometimes with unequal parvicostellae, small interarea, small arched pseudodeltidium, no chilidium, widely divergent teeth, socket plates, bilobed but weakly impressed ventral muscle field, similar to Jonesea, but with elongated septules, rather than circular papillae, bema sometimes present, sometimes delineated only by larger septules.