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Nucleospira
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Athyridida
Superfamily:
Nucleospiroidea
Family:
Nucleospiridae
Formal Genus Name and Reference:
Nucleospira Hall in DAVIDSON, 1858, p. 412
Type Species:
N. ventricosa (HALL), Lochkovian, Lower Helderberg Group, New York, USA, a-e, lectotype, dorsal, ventral, lateral, anterior, and posterior views, AMNH 33416, Hall collection, ×2.5 (Alvarez & Brime, 2000), f, lateral view of jugum, approximately ×7 (Hall & CLARKE, 1893).
Images
(Click to enlarge in a new window)
Fig. 1075a-f. *N. ventricosa (HAll), Lochkovian, Lower Helderberg Group, New York, USA, $a-e$, lectotype, dorsal, ventral, lateral, anterior, and posterior views, AMNH 33416, Hall collection, x2.5$ (Alvarez & Brime, 2000), $f$, lateral view of jugum, approximately x7$ (Hall & Clarke, 1893)., Fig. 1075 g. N. cunctata Cooper & Grant, Sakmarian, western Texas, USA, anterior oblique view of shell interior showing jugum and spires, USNM 154393g, ×8 (Cooper & Grant, 1976a, photograph courtesy of the late G. A. Cooper and the late R. E. Grant).
Synonyms
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Silurian (Llandovery)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Lower Permian (Sakmarian)
Ending International Stage:
Sakmarian
Fraction Up In Ending Stage:
100
Ending Date:
290.51
Description
Small, moderately to strongly biconvex, subcircular to transversely broadly elliptical shells, ventral valve commonly with shallow median sulcus forming weakly uniplicate anterior commissure, or both valves shallowly sulcate, producing slight emargination of anterior outline, ventral cardinal area, apsacline, concave, nearly equilaterally triangular, commonly obscured by small incurved ventral beak, ventral diductor scars flabellate, feebly impressed, enclosing elongate adductor scars, restricted to umbonal cavity. [Authorship is usually credited to HALL (1859a); however the first to publish the name was DAVIDSON (1858), who included Nucleospira H ALL with an existing species, N. ventricosa HALL. This is adequate to make the generic name Nucleospira available with N. ventricosa as type species by monotypy; therefore, under Article 50.1 of the Code (ICZN, 1999), authorship of Nucleospira is HALL in DAVIDSON, 1858.]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Athyridida
Superfamily:
Nucleospiroidea
Family:
Nucleospiridae
Formal Genus Name and Reference:
Nucleospira Hall in DAVIDSON, 1858, p. 412
Type Species:
N. ventricosa (HALL), Lochkovian, Lower Helderberg Group, New York, USA, a-e, lectotype, dorsal, ventral, lateral, anterior, and posterior views, AMNH 33416, Hall collection, ×2.5 (Alvarez & Brime, 2000), f, lateral view of jugum, approximately ×7 (Hall & CLARKE, 1893).
Images
(Click to enlarge in a new window)
Fig. 1075a-f. *N. ventricosa (HAll), Lochkovian, Lower Helderberg Group, New York, USA, $a-e$, lectotype, dorsal, ventral, lateral, anterior, and posterior views, AMNH 33416, Hall collection, x2.5$ (Alvarez & Brime, 2000), $f$, lateral view of jugum, approximately x7$ (Hall & Clarke, 1893)., Fig. 1075 g. N. cunctata Cooper & Grant, Sakmarian, western Texas, USA, anterior oblique view of shell interior showing jugum and spires, USNM 154393g, ×8 (Cooper & Grant, 1976a, photograph courtesy of the late G. A. Cooper and the late R. E. Grant).
Synonyms
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Silurian (Llandovery)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Lower Permian (Sakmarian)
Ending International Stage:
Sakmarian
Fraction Up In Ending Stage:
100
Ending Date:
290.51
Description
Small, moderately to strongly biconvex, subcircular to transversely broadly elliptical shells, ventral valve commonly with shallow median sulcus forming weakly uniplicate anterior commissure, or both valves shallowly sulcate, producing slight emargination of anterior outline, ventral cardinal area, apsacline, concave, nearly equilaterally triangular, commonly obscured by small incurved ventral beak, ventral diductor scars flabellate, feebly impressed, enclosing elongate adductor scars, restricted to umbonal cavity. [Authorship is usually credited to HALL (1859a); however the first to publish the name was DAVIDSON (1858), who included Nucleospira H ALL with an existing species, N. ventricosa HALL. This is adequate to make the generic name Nucleospira available with N. ventricosa as type species by monotypy; therefore, under Article 50.1 of the Code (ICZN, 1999), authorship of Nucleospira is HALL in DAVIDSON, 1858.]