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Spirigerina
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Atrypoidea
Family:
Atrypinidae
Formal Genus Name and Reference:
Spirigerina D'ORBIGNY, 1847, p. 268
Type Species:
Terebratula marginalis Dalman, 1828, p. 143, SD Alekseeva, 1960b, p. 64, vid. D'ORBIGNY, 1850 in 1849-1852, p. 42
Images
(Click to enlarge in a new window)
Fig. 970, 2a-i. *S. marginalis (Dalman), Wenlock, Gotland, $a-e$, dorsal, ventral, lateral, posterior, anterior views, x2, f-h$, serial sections, x5, i$, reconstruction of left brachidium, x5$ (new)."
Synonyms
Paraplectatrypa
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Silurian (middle Llandovery)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
66
Beginning Date:
439.24
Ending Stage in Treatise Usage:
Lower Devonian (Emsian)
Ending International Stage:
Emsian
Fraction Up In Ending Stage:
100
Ending Date:
394.3
Description
Medium size, subquadrate to pentagonal, dorsibiconvex, sharply pointed beak, triangular, orthocline area, apical foramen prominent, deltidial plates well developed, corrugate medium to coarse ribs, expanding distally, ventral midrib pair bi- to trifurcating with intervening sulcus filled by ribs, dorsal strongly bifurcating midrib, ribs ornamented by fine concentric filae, radial capillae, strong, angularrounded, plicate commissure, internally thin pedicle callist, prominent hollow deltidial plates, strong, wide teeth, slitlike dental nucleus expanding to dental cavity anteriorly, thick central hinge plate, narrow cardinal pit, very thin socket plates, bulbous inner socket ridges, small, delicate crura, dorsal spiralia of fewer than 6 whorls, spiral lamellae widely spaced, jugal processes recurved in center, lacking jugal plates.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Atrypoidea
Family:
Atrypinidae
Formal Genus Name and Reference:
Spirigerina D'ORBIGNY, 1847, p. 268
Type Species:
Terebratula marginalis Dalman, 1828, p. 143, SD Alekseeva, 1960b, p. 64, vid. D'ORBIGNY, 1850 in 1849-1852, p. 42
Images
(Click to enlarge in a new window)
Fig. 970, 2a-i. *S. marginalis (Dalman), Wenlock, Gotland, $a-e$, dorsal, ventral, lateral, posterior, anterior views, x2, f-h$, serial sections, x5, i$, reconstruction of left brachidium, x5$ (new)."
Synonyms
Paraplectatrypa
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Silurian (middle Llandovery)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
66
Beginning Date:
439.24
Ending Stage in Treatise Usage:
Lower Devonian (Emsian)
Ending International Stage:
Emsian
Fraction Up In Ending Stage:
100
Ending Date:
394.3
Description
Medium size, subquadrate to pentagonal, dorsibiconvex, sharply pointed beak, triangular, orthocline area, apical foramen prominent, deltidial plates well developed, corrugate medium to coarse ribs, expanding distally, ventral midrib pair bi- to trifurcating with intervening sulcus filled by ribs, dorsal strongly bifurcating midrib, ribs ornamented by fine concentric filae, radial capillae, strong, angularrounded, plicate commissure, internally thin pedicle callist, prominent hollow deltidial plates, strong, wide teeth, slitlike dental nucleus expanding to dental cavity anteriorly, thick central hinge plate, narrow cardinal pit, very thin socket plates, bulbous inner socket ridges, small, delicate crura, dorsal spiralia of fewer than 6 whorls, spiral lamellae widely spaced, jugal processes recurved in center, lacking jugal plates.