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Spiriferina
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferinida
Superfamily:
Spiriferinoidea
Family:
Spiriferinidae
Formal Genus Name and Reference:
Spiriferina D'ORBIGNY, 1847, p. 268
Type Species:
Spirifer walcotti J. de C. Sowerby, 1823 in 1823-1825, p. 106, SD DALL, 1877a, p. 64
Images
(Click to enlarge in a new window)
Fig. 1286, 3a-b. *S. walcotti (Sowerby), Liassic, British Islands, dorsal and anterior views, X1 (Pitrat, 1965).
Synonyms
Geographic Distribution
Europe, North Africa, Saudi Arabia, USA (Alaska)
Age Range
Beginning Stage in Treatise Usage:
Lower Jurassic
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
Lower Jurassic
Ending International Stage:
Toarcian
Fraction Up In Ending Stage:
100
Ending Date:
174.7
Description
Small to medium size, unequally biconvex, ventral valve usually much thicker than dorsal, outline variable from transversely to longitudinally subelliptical, cardinal extremities rounded, ventral umbonal region usually inflated, beak incurved, ventral interarea narrow, concave, apsacline, usually low to moderately high, beak ridges rounded, delthyrium restricted by rarely preserved stegidial plates, fold and sulcus smooth, subangular, moderately wide, moderately developed, moderately well delimited, lateral slopes with few, subangular plicae, dental adminicula short, ventral median septum long, ctenophoridium stout, supported by median septum forming septalium with crural bases in type species, jugum unknown, microornament of dense, fine spinules, punctae moderately fine, not densely spaced
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferinida
Superfamily:
Spiriferinoidea
Family:
Spiriferinidae
Formal Genus Name and Reference:
Spiriferina D'ORBIGNY, 1847, p. 268
Type Species:
Spirifer walcotti J. de C. Sowerby, 1823 in 1823-1825, p. 106, SD DALL, 1877a, p. 64
Images
(Click to enlarge in a new window)
Fig. 1286, 3a-b. *S. walcotti (Sowerby), Liassic, British Islands, dorsal and anterior views, X1 (Pitrat, 1965).
Synonyms
Geographic Distribution
Europe, North Africa, Saudi Arabia, USA (Alaska)
Age Range
Beginning Stage in Treatise Usage:
Lower Jurassic
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
Lower Jurassic
Ending International Stage:
Toarcian
Fraction Up In Ending Stage:
100
Ending Date:
174.7
Description
Small to medium size, unequally biconvex, ventral valve usually much thicker than dorsal, outline variable from transversely to longitudinally subelliptical, cardinal extremities rounded, ventral umbonal region usually inflated, beak incurved, ventral interarea narrow, concave, apsacline, usually low to moderately high, beak ridges rounded, delthyrium restricted by rarely preserved stegidial plates, fold and sulcus smooth, subangular, moderately wide, moderately developed, moderately well delimited, lateral slopes with few, subangular plicae, dental adminicula short, ventral median septum long, ctenophoridium stout, supported by median septum forming septalium with crural bases in type species, jugum unknown, microornament of dense, fine spinules, punctae moderately fine, not densely spaced