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Imbricatia
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Porambonitoidea
Family:
Tetralobulidae
Formal Genus Name and Reference:
Imbricatia COOPER, 1952, p. 21
Type Species:
I. lamellata, OD
Images
(Click to enlarge in a new window)
Fig. 628, 3a-g. *I. lamellata, Cool Creek Formation, Oklahoma, USA, $a$, ventral valve exterior, $b$, dorsal valve exterior, $c$, dorsal valve lateral view, $d$, ventral valve interior, $e$, ventral valve interior, gerontic individual, $f$, dorsal valve interior, $g$, dorsal valve interior, gerontic individual, x2$ (Cooper, 1952).
Synonyms
Thaumatrophia, Thaumotrophia
Geographic Distribution
USA, Canada, Kazakhstan, Novaya Zemlya, China, ?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 (Tremadoc)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Finely costellate with strong, sharp, concentric lamellae, teeth small, spondylial structure quite variable, type species with sessile spondylium supported anteriorly by low, wide ridge, others with spondylium simplex supported by high, wide median septum, accessory septa absent, dorsal adductor muscle field not elevated, but weak callosities are present.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Porambonitoidea
Family:
Tetralobulidae
Formal Genus Name and Reference:
Imbricatia COOPER, 1952, p. 21
Type Species:
I. lamellata, OD
Images
(Click to enlarge in a new window)
Fig. 628, 3a-g. *I. lamellata, Cool Creek Formation, Oklahoma, USA, $a$, ventral valve exterior, $b$, dorsal valve exterior, $c$, dorsal valve lateral view, $d$, ventral valve interior, $e$, ventral valve interior, gerontic individual, $f$, dorsal valve interior, $g$, dorsal valve interior, gerontic individual, x2$ (Cooper, 1952).
Synonyms
Thaumatrophia, Thaumotrophia
Geographic Distribution
USA, Canada, Kazakhstan, Novaya Zemlya, China, ?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 (Tremadoc)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Finely costellate with strong, sharp, concentric lamellae, teeth small, spondylial structure quite variable, type species with sessile spondylium supported anteriorly by low, wide ridge, others with spondylium simplex supported by high, wide median septum, accessory septa absent, dorsal adductor muscle field not elevated, but weak callosities are present.