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Eosotrematorthis
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
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, $X_{2}$, $b$, posterior view of ventral valve showing details of interarea, $X_{4}$, c, dorsal interior, $X_{3}$, 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
Class:
Strophomenata
Order:
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, $X_{2}$, $b$, posterior view of ventral valve showing details of interarea, $X_{4}$, c, dorsal interior, $X_{3}$, 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.