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Leptagonia
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Strophomenoidea
Family:
Rafinesquinidae
Formal Genus Name and Reference:
Leptagonia M'COR, 1844, p. 116
Type Species:
Producta analoga PHILLIPS, 1836, p. 215, OD
Images
(Click to enlarge in a new window)
Fig. 154, Ia-d. *L. analoga (Phillips), $a, b$, lectotype, ventral, lateral views of conjoined valves, Carboniferous Limestone, Viséan, Bolland, Yorkshire, BMNH B 8936, x1.5$, c, ventral interior, Redesdale Formation, Viséan, Redesdale, Cumbria, England, BMNH B 46524, X2, dorsal interior, Redesdale Formation, Viséan, Redesdale, Cumbria, England, BMNH B 43708, x1.5$ (new).
Synonyms
Adiaphragma
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Emsian
Beginning International Stage:
Emsian
Fraction Up In Beginning Stage:
0
Beginning Date:
410.51
Ending Stage in Treatise Usage:
Carboniferous (Namurian)
Ending International Stage:
Bashkirian
Fraction Up In Ending Stage:
48.4
Ending Date:
319.4
Description
Profile gently biconvex posteriorly with ventral geniculation followed by dorsal geniculation, distinctive ornament of small rugae interrupted by costellae, sometimes achieving interference pattern, strong divergent dental plates, leading to elevated bounding ridges surrounding subcircular ventral muscle field divided by low median ridge, thin widely diverging socket ridges, dorsal transmuscle ridges.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Strophomenoidea
Family:
Rafinesquinidae
Formal Genus Name and Reference:
Leptagonia M'COR, 1844, p. 116
Type Species:
Producta analoga PHILLIPS, 1836, p. 215, OD
Images
(Click to enlarge in a new window)
Fig. 154, Ia-d. *L. analoga (Phillips), $a, b$, lectotype, ventral, lateral views of conjoined valves, Carboniferous Limestone, Viséan, Bolland, Yorkshire, BMNH B 8936, x1.5$, c, ventral interior, Redesdale Formation, Viséan, Redesdale, Cumbria, England, BMNH B 46524, X2, dorsal interior, Redesdale Formation, Viséan, Redesdale, Cumbria, England, BMNH B 43708, x1.5$ (new).
Synonyms
Adiaphragma
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Emsian
Beginning International Stage:
Emsian
Fraction Up In Beginning Stage:
0
Beginning Date:
410.51
Ending Stage in Treatise Usage:
Carboniferous (Namurian)
Ending International Stage:
Bashkirian
Fraction Up In Ending Stage:
48.4
Ending Date:
319.4
Description
Profile gently biconvex posteriorly with ventral geniculation followed by dorsal geniculation, distinctive ornament of small rugae interrupted by costellae, sometimes achieving interference pattern, strong divergent dental plates, leading to elevated bounding ridges surrounding subcircular ventral muscle field divided by low median ridge, thin widely diverging socket ridges, dorsal transmuscle ridges.