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Davidsonia
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Davidsonioidea
Family:
Davidsoniidae
Formal Genus Name and Reference:
Davidsonia BOUCHARD -CHANTEREAUX , 1849, p. 92
Type Species:
D. verneuillii; OD
Images
(Click to enlarge in a new window)
Fig. 979,1a–f. *D. verneuillii, upper Eifelian, Germany; a–c, exterior dorsal view, interior ventral valve (cemented to alveolitid coral), interior dorsal valve, ×2 (new); df, serial sections, ×5 (Copper, 1978).
Synonyms
Geographic Distribution
Europe, central Asia, China, USA (Nevada)
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (Emsian)
Beginning International Stage:
Emsian
Fraction Up In Beginning Stage:
0
Beginning Date:
410.51
Ending Stage in Treatise Usage:
Middle Devonian (upper Givetian)
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Medium to large, commonly asymmetrical, wider than long, subquadrate to rounded in outline, smooth, flat to ventribiconvexplanoconvex; cemented ventral valve thick in gerontic stages, usually cemented to hard substrates from apex to commissure, rarely free; dorsal valve flat to weakly concave; enlarged, flat, normally apsacline area; pointed, triangular beak; delthyrial cavity normally completely sealed by conjunct deltidial plates (foramen, deltidium, chilidium absent); surface smooth to concentrically wrinkled; rectimarginate commissure; pedicle collar lining apical cavity; teeth solid; hinge plate short, thick, lacking cardinal pit, capped by prominent, bushy cardinal process; crura projected from inner socket ridges; spiralia, rarely preserved, impressed in grooves of raised cones on ventral valve, fewer than 6 whorls, dorsally directed; jugal processes undescribed (except as fragments). [Distinct from other davidsoniids in fixosessile cementation of ventral valve, common asymmetry, lack of foramen.]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Davidsonioidea
Family:
Davidsoniidae
Formal Genus Name and Reference:
Davidsonia BOUCHARD -CHANTEREAUX , 1849, p. 92
Type Species:
D. verneuillii; OD
Images
(Click to enlarge in a new window)
Fig. 979,1a–f. *D. verneuillii, upper Eifelian, Germany; a–c, exterior dorsal view, interior ventral valve (cemented to alveolitid coral), interior dorsal valve, ×2 (new); df, serial sections, ×5 (Copper, 1978).
Synonyms
Geographic Distribution
Europe, central Asia, China, USA (Nevada)
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (Emsian)
Beginning International Stage:
Emsian
Fraction Up In Beginning Stage:
0
Beginning Date:
410.51
Ending Stage in Treatise Usage:
Middle Devonian (upper Givetian)
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Medium to large, commonly asymmetrical, wider than long, subquadrate to rounded in outline, smooth, flat to ventribiconvexplanoconvex; cemented ventral valve thick in gerontic stages, usually cemented to hard substrates from apex to commissure, rarely free; dorsal valve flat to weakly concave; enlarged, flat, normally apsacline area; pointed, triangular beak; delthyrial cavity normally completely sealed by conjunct deltidial plates (foramen, deltidium, chilidium absent); surface smooth to concentrically wrinkled; rectimarginate commissure; pedicle collar lining apical cavity; teeth solid; hinge plate short, thick, lacking cardinal pit, capped by prominent, bushy cardinal process; crura projected from inner socket ridges; spiralia, rarely preserved, impressed in grooves of raised cones on ventral valve, fewer than 6 whorls, dorsally directed; jugal processes undescribed (except as fragments). [Distinct from other davidsoniids in fixosessile cementation of ventral valve, common asymmetry, lack of foramen.]