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Attenuatella
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Ambocoelioidea
Family:
Ambocoeliidae
Formal Genus Name and Reference:
Attenuatella STEHLI, 1954, p. 343
Type Species:
A. texana, OD
Images
(Click to enlarge in a new window)
Fig. 1137, 4ad. *A. texana, Artinskian, Texas, ventral, posterior, lateral, and interior views of ventral valve, X2 (Cooper & Grant, 1976a), Fig. 1137, 4e-f. A. attenuata (Cloud), Wordian, Mexico, internal molds of both valves, X3 (Cooper & Grant, 1976a)
Synonyms
Geographic Distribution
USA (Texas), Russia, Mexico, Australia, New Zealand
Age Range
Beginning Stage in Treatise Usage:
Permian (Artinskian)
Beginning International Stage:
Artinskian
Fraction Up In Beginning Stage:
0
Beginning Date:
290.51
Ending Stage in Treatise Usage:
Permian (Lopingian)
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Ventral valve strongly inflated, longitudinally elongated, with strongly incurved beak and shallow sulcus, dorsal valve nearly flat, nonsulcate, ventral interior with diductor scars raised on long, low narrow ridge with low lateral flanges, dorsal interior with diverging crural bases nearly touching poste- rior of valve, crura very long, rodlike, spiralia absent, microornament as in Crurithyris
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Ambocoelioidea
Family:
Ambocoeliidae
Formal Genus Name and Reference:
Attenuatella STEHLI, 1954, p. 343
Type Species:
A. texana, OD
Images
(Click to enlarge in a new window)
Fig. 1137, 4ad. *A. texana, Artinskian, Texas, ventral, posterior, lateral, and interior views of ventral valve, X2 (Cooper & Grant, 1976a), Fig. 1137, 4e-f. A. attenuata (Cloud), Wordian, Mexico, internal molds of both valves, X3 (Cooper & Grant, 1976a)
Synonyms
Geographic Distribution
USA (Texas), Russia, Mexico, Australia, New Zealand
Age Range
Beginning Stage in Treatise Usage:
Permian (Artinskian)
Beginning International Stage:
Artinskian
Fraction Up In Beginning Stage:
0
Beginning Date:
290.51
Ending Stage in Treatise Usage:
Permian (Lopingian)
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Ventral valve strongly inflated, longitudinally elongated, with strongly incurved beak and shallow sulcus, dorsal valve nearly flat, nonsulcate, ventral interior with diductor scars raised on long, low narrow ridge with low lateral flanges, dorsal interior with diverging crural bases nearly touching poste- rior of valve, crura very long, rodlike, spiralia absent, microornament as in Crurithyris