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Aphelotreta
Classification
Phylum:
Brachiopoda
Class:
Lingulata
Order:
Acrotretida
Superfamily:
Acrotretoidea
Family:
Acrotretidae
Formal Genus Name and Reference:
Aphelotreta ROWELE, 1980, p. 10
Type Species:
* A. minuta, OD
Images
(Click to enlarge in a new window)
Fig. 53, 3a-d. *A. minuta, Pioche Shale, Albertella Biozone, Highland Range, Nevada, $a$, ventral valve exterior, KUMIP 115472, x41.7, b$, dorsal valve exterior, KUMIP 115511, $\\mathbf{X} 41.7$, c, ventral valve interior, KUMIP 115469, x41.7$, dorsal valve interior, KUMIP 115471, x41.7$ (Rowell, 1980).
Synonyms
Geographic Distribution
USA (Nevada), Russia (northcentral Siberia), ?Australia (New South Wales)
Age Range
Beginning Stage in Treatise Usage:
lower Middle Cambrian
Beginning International Stage:
Wuliuan
Fraction Up In Beginning Stage:
0
Beginning Date:
509
Ending Stage in Treatise Usage:
lower Upper Cambrian
Ending International Stage:
Jiangshanian
Fraction Up In Ending Stage:
25
Ending Date:
493.4
Description
Shell biconvex, subcircular with short, weakly concave posterior margin, ventral pseudointerarea low catacline to moderately apsacline with indistinct intertrough, foramen small, not enclosed within larval shell, dorsal pseudointerarea with short anacline to orthocline propareas and wide median groove, apical process vestigial, forming low, elongate triangular thickening anterior to foramen, dorsal interior with poorly developed median ridge and median buttress.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Lingulata
Order:
Acrotretida
Superfamily:
Acrotretoidea
Family:
Acrotretidae
Formal Genus Name and Reference:
Aphelotreta ROWELE, 1980, p. 10
Type Species:
* A. minuta, OD
Images
(Click to enlarge in a new window)
Fig. 53, 3a-d. *A. minuta, Pioche Shale, Albertella Biozone, Highland Range, Nevada, $a$, ventral valve exterior, KUMIP 115472, x41.7, b$, dorsal valve exterior, KUMIP 115511, $\\mathbf{X} 41.7$, c, ventral valve interior, KUMIP 115469, x41.7$, dorsal valve interior, KUMIP 115471, x41.7$ (Rowell, 1980).
Synonyms
Geographic Distribution
USA (Nevada), Russia (northcentral Siberia), ?Australia (New South Wales)
Age Range
Beginning Stage in Treatise Usage:
lower Middle Cambrian
Beginning International Stage:
Wuliuan
Fraction Up In Beginning Stage:
0
Beginning Date:
509
Ending Stage in Treatise Usage:
lower Upper Cambrian
Ending International Stage:
Jiangshanian
Fraction Up In Ending Stage:
25
Ending Date:
493.4
Description
Shell biconvex, subcircular with short, weakly concave posterior margin, ventral pseudointerarea low catacline to moderately apsacline with indistinct intertrough, foramen small, not enclosed within larval shell, dorsal pseudointerarea with short anacline to orthocline propareas and wide median groove, apical process vestigial, forming low, elongate triangular thickening anterior to foramen, dorsal interior with poorly developed median ridge and median buttress.