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Neospirifer
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Spiriferoidea
Family:
Trigonotretidae
Formal Genus Name and Reference:
Neospirifer Frederiks, 1924, p. 311 (NIKITIN, 1900, p. 385, nom. nud.)
Type Species:
Spirifer fasciger KEYSERLING, 1846, p. 231, OD
Images
(Click to enlarge in a new window)
Fig. 1185, 1 a-c. *N*. fasciger (Keyserling), Cisuralian, Russia, a, lectotype, dorsal internal mold, X1 (Archbold & Thomas, 1984b), b-c, paralectotype, ventral and posterior views of ventral valve, X1 (new).
Synonyms
Geographic Distribution
Russia, Pakistan
Age Range
Beginning Stage in Treatise Usage:
Permian
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Medium size, thin shelled, transverse with fasciculate and plicate lateral slopes, cardinal extremities rounded in all growth stages of type species, ventral interarea narrowly triangular in type species, subangular fold and sulcus well developed, sulcal costae numerous, not fasciculate, costae on lateral slopes not coarse, bifurcating near beaks, again in umbonal region, continuing to branch anteriorly, resulting in fascicles of 6 to 8 or more at anterior margin, costae nearly equidimensional anteriorly, ventral interior with very short delthyrial plate and short dental adminicula, microornament unknown in type species. Permian: Russia, Pakistan.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Spiriferoidea
Family:
Trigonotretidae
Formal Genus Name and Reference:
Neospirifer Frederiks, 1924, p. 311 (NIKITIN, 1900, p. 385, nom. nud.)
Type Species:
Spirifer fasciger KEYSERLING, 1846, p. 231, OD
Images
(Click to enlarge in a new window)
Fig. 1185, 1 a-c. *N*. fasciger (Keyserling), Cisuralian, Russia, a, lectotype, dorsal internal mold, X1 (Archbold & Thomas, 1984b), b-c, paralectotype, ventral and posterior views of ventral valve, X1 (new).
Synonyms
Geographic Distribution
Russia, Pakistan
Age Range
Beginning Stage in Treatise Usage:
Permian
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Medium size, thin shelled, transverse with fasciculate and plicate lateral slopes, cardinal extremities rounded in all growth stages of type species, ventral interarea narrowly triangular in type species, subangular fold and sulcus well developed, sulcal costae numerous, not fasciculate, costae on lateral slopes not coarse, bifurcating near beaks, again in umbonal region, continuing to branch anteriorly, resulting in fascicles of 6 to 8 or more at anterior margin, costae nearly equidimensional anteriorly, ventral interior with very short delthyrial plate and short dental adminicula, microornament unknown in type species. Permian: Russia, Pakistan.