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Eosotrematorthis
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Strophomenata
Order:
Orthotetida
Suborder:
Billingsellidina
Superfamily:
Billingselloidea
Family:
Billingsellidae
Formal Genus Name and Reference:
Eosotrematorthis WANG, 1955a, p. 93
Type Species:
E. sinensis, OD
Images
(Click to enlarge in a new window)
Fig. 498, 2a-d. * E. sinensis, Arenig, southern China, a, ventral interior, X2, b, posterior view of ventral valve showing details of interarea, X4, c, dorsal interior, X3, d, dorsal exterior, x2 (Wang, 1955a).
Synonyms
Geographic Distribution
southern China
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Arenig)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
477.08
Ending Stage in Treatise Usage:
Lower Ordovician (Arenig)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Similar to Billingsella but ramicostellate with an apsacline ventral interarea, recessive dental plates, rodlike socket ridges, a small subcordate ventral muscle field with a lanceolate adductor track not enclosed by larger subtriangular diductor scars, and a low median ridge in the ventral valve.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Strophomenata
Order:
Orthotetida
Suborder:
Billingsellidina
Superfamily:
Billingselloidea
Family:
Billingsellidae
Formal Genus Name and Reference:
Eosotrematorthis WANG, 1955a, p. 93
Type Species:
E. sinensis, OD
Images
(Click to enlarge in a new window)
Fig. 498, 2a-d. * E. sinensis, Arenig, southern China, a, ventral interior, X2, b, posterior view of ventral valve showing details of interarea, X4, c, dorsal interior, X3, d, dorsal exterior, x2 (Wang, 1955a).
Synonyms
Geographic Distribution
southern China
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Arenig)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
477.08
Ending Stage in Treatise Usage:
Lower Ordovician (Arenig)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Similar to Billingsella but ramicostellate with an apsacline ventral interarea, recessive dental plates, rodlike socket ridges, a small subcordate ventral muscle field with a lanceolate adductor track not enclosed by larger subtriangular diductor scars, and a low median ridge in the ventral valve.