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Purdonella
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Spiriferoidea
Family:
Spiriferidae
Formal Genus Name and Reference:
Purdonella Reed, 1944, p. 218, nom. nov. pro Munella Frederiks, 1924, p. 314, non BONNIER, 1896
Type Species:
Spirifer nikitini CHERNYSHEV, 1902, p. 542, OD
Images
(Click to enlarge in a new window)
Fig. 1174, 3a-d. * P. nikitini (Chernyshev), Cisuralian, southern Urals, ventral, dorsal, posterior, and lateral views, X1 (new).
Synonyms
Geographic Distribution
southern Urals, Arctic Russia
Age Range
Beginning Stage in Treatise Usage:
Carboniferous (Moscovian)
Beginning International Stage:
Moscovian
Fraction Up In Beginning Stage:
0
Beginning Date:
315.15
Ending Stage in Treatise Usage:
Permian (Cisuralian)
Ending International Stage:
Kungurian
Fraction Up In Ending Stage:
100
Ending Date:
274.37
Description
Medium to large, outline subcircular to subovate, ventral umbonal region moderately narrow, moderately inflated, hinge line narrow, not exceeding half of maximum width, fold and sulcus weakly developed, poorly delimited from lateral slopes, entire surface multicostate with numerous, low, flattened, simple or bifurcating costae, ventral interior with short, very thin, subparallel dental adminicula and distinct delthyrial plate, shell substance relatively thin with weak development of prismatic secondary layer in umbonal region
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Spiriferoidea
Family:
Spiriferidae
Formal Genus Name and Reference:
Purdonella Reed, 1944, p. 218, nom. nov. pro Munella Frederiks, 1924, p. 314, non BONNIER, 1896
Type Species:
Spirifer nikitini CHERNYSHEV, 1902, p. 542, OD
Images
(Click to enlarge in a new window)
Fig. 1174, 3a-d. * P. nikitini (Chernyshev), Cisuralian, southern Urals, ventral, dorsal, posterior, and lateral views, X1 (new).
Synonyms
Geographic Distribution
southern Urals, Arctic Russia
Age Range
Beginning Stage in Treatise Usage:
Carboniferous (Moscovian)
Beginning International Stage:
Moscovian
Fraction Up In Beginning Stage:
0
Beginning Date:
315.15
Ending Stage in Treatise Usage:
Permian (Cisuralian)
Ending International Stage:
Kungurian
Fraction Up In Ending Stage:
100
Ending Date:
274.37
Description
Medium to large, outline subcircular to subovate, ventral umbonal region moderately narrow, moderately inflated, hinge line narrow, not exceeding half of maximum width, fold and sulcus weakly developed, poorly delimited from lateral slopes, entire surface multicostate with numerous, low, flattened, simple or bifurcating costae, ventral interior with short, very thin, subparallel dental adminicula and distinct delthyrial plate, shell substance relatively thin with weak development of prismatic secondary layer in umbonal region