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Prodavidsonia
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Davidsonioidea
Family:
Davidsoniidae
Formal Genus Name and Reference:
Prodavidsonia Havlíček, 1956, p. 564
Type Species:
P. dalejensis, OD
Images
(Click to enlarge in a new window)
Fig. 979, 2a-e. * P. dalejensis, Emsian, Czech Republic, $a-d$, dorsal, ventral, anterior, posterior views, x2$ (new), $e$, interior ventral valve, x3$ (Havlíček, 1987a).
Synonyms
Quasidavidsonia
Geographic Distribution
western Europe, Urals
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (?Pragian, Emsian)
Beginning International Stage:
Pragian
Fraction Up In Beginning Stage:
0
Beginning Date:
412.4
Ending Stage in Treatise Usage:
Middle Devonian (lower Givetian)
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
35
Ending Date:
383.06
Description
Symmetrical, wider than long, flat, planoconvex to weakly concavoconvex to weakly ventribiconvex, weakly carinate, weakly convex ventral valve, weakly convex, flat, posteriorly sulcate dorsal valve, shell liberosessile, wide apsaclineorthocline area, slightly projecting beak, apical foramen flanked by deltidial plates, smooth to weakly concentrically ornamented surface, commissure rectimarginate to weakly sulcate, teeth solid, hinge plate Davidsonia-like with small cardinal process, spiralial grooves impressed in raised cones of ventral valve, spiralia, jugal processes undescribed. [Spiralial grooves in ventral valve, muscle scars as in Davidsonia, but more weakly impressed; differs in having apical foramen, liberosessile ventral valve (uncemented to substrate), bilateral symmetry, wider than long shape.]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Davidsonioidea
Family:
Davidsoniidae
Formal Genus Name and Reference:
Prodavidsonia Havlíček, 1956, p. 564
Type Species:
P. dalejensis, OD
Images
(Click to enlarge in a new window)
Fig. 979, 2a-e. * P. dalejensis, Emsian, Czech Republic, $a-d$, dorsal, ventral, anterior, posterior views, x2$ (new), $e$, interior ventral valve, x3$ (Havlíček, 1987a).
Synonyms
Quasidavidsonia
Geographic Distribution
western Europe, Urals
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (?Pragian, Emsian)
Beginning International Stage:
Pragian
Fraction Up In Beginning Stage:
0
Beginning Date:
412.4
Ending Stage in Treatise Usage:
Middle Devonian (lower Givetian)
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
35
Ending Date:
383.06
Description
Symmetrical, wider than long, flat, planoconvex to weakly concavoconvex to weakly ventribiconvex, weakly carinate, weakly convex ventral valve, weakly convex, flat, posteriorly sulcate dorsal valve, shell liberosessile, wide apsaclineorthocline area, slightly projecting beak, apical foramen flanked by deltidial plates, smooth to weakly concentrically ornamented surface, commissure rectimarginate to weakly sulcate, teeth solid, hinge plate Davidsonia-like with small cardinal process, spiralial grooves impressed in raised cones of ventral valve, spiralia, jugal processes undescribed. [Spiralial grooves in ventral valve, muscle scars as in Davidsonia, but more weakly impressed; differs in having apical foramen, liberosessile ventral valve (uncemented to substrate), bilateral symmetry, wider than long shape.]