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Syntrophopsis
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Porambonitoidea
Family:
Tetralobulidae
Formal Genus Name and Reference:
Syntrophopsis Ulrich & COOPER, 1936, p. 630
Type Species:
S. magna, OD
Images
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Fig. 629, 1a-g. *S. magna, Odenville Formation, Alabama, USA, $a$, ventral valve exterior, $b$, articulated valves, ventral valve on left, $c$, dorsal valve exterior, $d$, articulated valves, posterior view, $e$, articulated valves, anterior view, $f$, ventral valve interior, $g$, dorsal valve interior, x1.5$ (Ulrich & Cooper, 1938).
Synonyms
Geographic Distribution
USA, Scotland, southern China, north-central Russia, Siberia, Tasmania, ?Argentina
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 (Arenig)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
large type species, others commonly small to moderate in size, smooth, uniplication present only on the anterior half, teeth relatively small, long, sessile spondylium supported at the anterior only by a low, wide ridge that widens to a broad, slightly elevated triangular area anterior to the spondylium between digitate mantle canals, median ridge absent in some species, long socket plates discrete and closely spaced, fulcral plates present under sockets, very weak callosities mark the dorsal adductor muscle field