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Borealis
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Pentameroidea
Family:
Virgianidae
Formal Genus Name and Reference:
Borealis Boucot, Johnson, & RUBEL, 1971, p. 274
Type Species:
Gypidia borealis EICHWALD, 1843, p. 74, OD
Images
(Click to enlarge in a new window)
Fig. 644, 1a-g. *B. borealis (Eichwald), Juuru Stage, Estonia, $a-d$, lateral, ventral, dorsal, and lateral views of articulated specimens, x1.3$, $e$, dorsal view of interior mold, x1.4, f$, interior of ventral valve, x1.5, g$, dorsal view of dorsal interior mold, x2$ (Boucot, Johnson, & Rubel, 1971).
Synonyms
Gypidia
Geographic Distribution
Baltic region, South China, Russia (Kolyma, Siberia)
Age Range
Beginning Stage in Treatise Usage:
Silurian (lower Llandovery)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Silurian (lower Llandovery)
Ending International Stage:
Rhuddanian
Fraction Up In Ending Stage:
100
Ending Date:
440.49
Description
Medium, smooth, ventribiconvex, elongate, short, broad spondylium supported by well-developed median septum
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Pentameroidea
Family:
Virgianidae
Formal Genus Name and Reference:
Borealis Boucot, Johnson, & RUBEL, 1971, p. 274
Type Species:
Gypidia borealis EICHWALD, 1843, p. 74, OD
Images
(Click to enlarge in a new window)
Fig. 644, 1a-g. *B. borealis (Eichwald), Juuru Stage, Estonia, $a-d$, lateral, ventral, dorsal, and lateral views of articulated specimens, x1.3$, $e$, dorsal view of interior mold, x1.4, f$, interior of ventral valve, x1.5, g$, dorsal view of dorsal interior mold, x2$ (Boucot, Johnson, & Rubel, 1971).
Synonyms
Gypidia
Geographic Distribution
Baltic region, South China, Russia (Kolyma, Siberia)
Age Range
Beginning Stage in Treatise Usage:
Silurian (lower Llandovery)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Silurian (lower Llandovery)
Ending International Stage:
Rhuddanian
Fraction Up In Ending Stage:
100
Ending Date:
440.49
Description
Medium, smooth, ventribiconvex, elongate, short, broad spondylium supported by well-developed median septum