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Westonia
Classification
Phylum:
Brachiopoda
Subphylum:
Linguliformea
Class:
Lingulata
Order:
Lingulida
Superfamily:
Linguloidea
Family:
Obolidae
Subfamily:
Obolinae
Formal Genus Name and Reference:
Westonia WALCOTT, 1901, p. 683
Type Species:
Lingula aurora HALL, 1861a, p. 24, OD
Images
(Click to enlarge in a new window)
Fig. 21,1a–d. *W. aurora (HALL), St. Croix Sandstone, Upper Cambrian, Wisconsin; a, latex cast of ventral internal mold, USNM 51681c, × 1.7; b, ventral internal mold, USNM 51681a, ×1.7; c, latex cast of dorsal external mold, USNM 51681d, ×1.7 (new); d, detail of ornamentation of external mold of ventral valve, USNM 459674, ×8.3 (Savazzi, 1986).
Synonyms
Geographic Distribution
Canada, USA, Russia, Spain, China, Australia
Age Range
Beginning Stage in Treatise Usage:
Middle Cambrian
Beginning International Stage:
Wuliuan
Fraction Up In Beginning Stage:
0
Beginning Date:
509
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Shell elongate suboval to subtriangular, gently biconvex, unequivalved, ornamented by fine, concentric growth lines crossed by irregular, transverse lines, forming zigzag lines in posterior half of valve, ventral pseudointerarea with narrow, triangular pedicle groove and slightly elevated propareas with flexure lines, dorsal pseudointerarea with flexure lines and median groove, visceral areas weakly impressed in both valves, dorsal visceral area with median projection extending anterior to midlength, dorsal central and anterior lateral muscle scars widely spaced, dorsal median ridge variably developed, vascula lateralia in both valves submarginal, arcuate
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Subphylum:
Linguliformea
Class:
Lingulata
Order:
Lingulida
Superfamily:
Linguloidea
Family:
Obolidae
Subfamily:
Obolinae
Formal Genus Name and Reference:
Westonia WALCOTT, 1901, p. 683
Type Species:
Lingula aurora HALL, 1861a, p. 24, OD
Images
(Click to enlarge in a new window)
Fig. 21,1a–d. *W. aurora (HALL), St. Croix Sandstone, Upper Cambrian, Wisconsin; a, latex cast of ventral internal mold, USNM 51681c, × 1.7; b, ventral internal mold, USNM 51681a, ×1.7; c, latex cast of dorsal external mold, USNM 51681d, ×1.7 (new); d, detail of ornamentation of external mold of ventral valve, USNM 459674, ×8.3 (Savazzi, 1986).
Synonyms
Geographic Distribution
Canada, USA, Russia, Spain, China, Australia
Age Range
Beginning Stage in Treatise Usage:
Middle Cambrian
Beginning International Stage:
Wuliuan
Fraction Up In Beginning Stage:
0
Beginning Date:
509
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Shell elongate suboval to subtriangular, gently biconvex, unequivalved, ornamented by fine, concentric growth lines crossed by irregular, transverse lines, forming zigzag lines in posterior half of valve, ventral pseudointerarea with narrow, triangular pedicle groove and slightly elevated propareas with flexure lines, dorsal pseudointerarea with flexure lines and median groove, visceral areas weakly impressed in both valves, dorsal visceral area with median projection extending anterior to midlength, dorsal central and anterior lateral muscle scars widely spaced, dorsal median ridge variably developed, vascula lateralia in both valves submarginal, arcuate