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Westonia
Classification
Phylum:
Brachiopoda
Class:
Lingulata
Order:
Lingulida
Superfamily:
Linguloidea
Family:
Obolidae
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.\n?Westonisca Havlíček, 1982, p. 28 *Lingula lamellosa Barrande, 1879, pl. 106, OD. Shell equally biconvex or slightly dorsibiconvex, elongate oval, ornamentation by concentric rugae, crossed by irregular, transverse lines, forming irregular zigzag lines, ventral pseudointerarea apsacline, lacking flexure lines, with shallow pedicle groove, dorsal pseudointerarea crescent shaped, forming narrow strip along posterior margin, ventral visceral area short, rhomboidal, not extending to midvalve, dorsal visceral area with long anterior projection, extending almost to anterior margin, ventral vascula lateralia submedian, arcuate, dorsal vascula lateralia subperipheral, subparallel, dorsal vascula media short, widely divergent. Lower Ordovician: Bohemia.--Fig. 21, 2ac. *W. lamellosa (Barrande), Trenice Formation, Libecov, $a$, partly exfoliated ventral valve, OMR VH 3193, X5, $b$, dorsal valve exterior, OMR VH 2990a, X3.3, $c$, dorsal valve exterior, OMR VH 2990b, X5 (new). Michal Mergl"
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
Class:
Lingulata
Order:
Lingulida
Superfamily:
Linguloidea
Family:
Obolidae
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.\n?Westonisca Havlíček, 1982, p. 28 *Lingula lamellosa Barrande, 1879, pl. 106, OD. Shell equally biconvex or slightly dorsibiconvex, elongate oval, ornamentation by concentric rugae, crossed by irregular, transverse lines, forming irregular zigzag lines, ventral pseudointerarea apsacline, lacking flexure lines, with shallow pedicle groove, dorsal pseudointerarea crescent shaped, forming narrow strip along posterior margin, ventral visceral area short, rhomboidal, not extending to midvalve, dorsal visceral area with long anterior projection, extending almost to anterior margin, ventral vascula lateralia submedian, arcuate, dorsal vascula lateralia subperipheral, subparallel, dorsal vascula media short, widely divergent. Lower Ordovician: Bohemia.--Fig. 21, 2ac. *W. lamellosa (Barrande), Trenice Formation, Libecov, $a$, partly exfoliated ventral valve, OMR VH 3193, X5, $b$, dorsal valve exterior, OMR VH 2990a, X3.3, $c$, dorsal valve exterior, OMR VH 2990b, X5 (new). Michal Mergl"
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