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Syntrophina
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Porambonitoidea
Family:
Clarkellidae
Formal Genus Name and Reference:
Syntrophina Schuchert & COOPER, 1931, p. 247
Type Species:
Syntrophia campbelli WALCOTT, 1908, p. 107, OD
Images
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Fig. 634, 2a-d. *S. campbelli (Walcott), McKenzie Hill Formation, Oklahoma, USA, $a$, ventral valve exterior; b, dorsal valve exterior; c, ventral valve interior; d, dorsal valve interior, ×2 (Cooper, 1952).
Synonyms
Syntrophina
Geographic Distribution
USA, Canada, Argentina, Ireland, Kazakhstan, Novaya Zemlya, China, India
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Tremadoc)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
Lower Ordovician (Tremadoc)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Smooth shells, with strong concentric lamellae in some species, uniplication variably developed, hinge line narrow, teeth strong, spondylium simplex relatively short and narrow, may be sessile at the extreme posterior of the valve, 2 short accessory septa present rarely in some species, deep petaloid socket plates continue anteriorly into short, divergent extensions, similar to Stichotrophia. Lower Ordovician (Tremadoc): USA, Canada, Argentina, Ireland, Kazakhstan, Novaya Zemlya, China, India.