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Sphenospira
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Cyrtospiriferoidea
Family:
Cyrtospiriferidae
Formal Genus Name and Reference:
Sphenospira COOPER, 1954b, p. 330
Type Species:
Spirifera alta HALL, 1867b, p. 248, OD
Images
(Click to enlarge in a new window)
Fig. 1132, 3a-b. *S. alta (Hall), Ohio, posterior and lateral views, X1 (Cooper, 1954b).
Synonyms
Geographic Distribution
eastern North America
Age Range
Beginning Stage in Treatise Usage:
Upper Devonian (Famennian)
Beginning International Stage:
Famennian
Fraction Up In Beginning Stage:
0
Beginning Date:
371.1
Ending Stage in Treatise Usage:
Upper Devonian (Famennian)
Ending International Stage:
Famennian
Fraction Up In Ending Stage:
100
Ending Date:
359.3
Description
Medium size, strongly ventribiconvex, transverse, with semiconical ventral valve, ventral interarea high, flat, catacline, sometimes with frills, delthyrium occluded by long delthyrial plate and stegidium, cardinal angles acute, fold and sulcus rounded, relatively narrow, surface tuberculate, dental plates long, divergent, ctenophoridium bilobed
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Cyrtospiriferoidea
Family:
Cyrtospiriferidae
Formal Genus Name and Reference:
Sphenospira COOPER, 1954b, p. 330
Type Species:
Spirifera alta HALL, 1867b, p. 248, OD
Images
(Click to enlarge in a new window)
Fig. 1132, 3a-b. *S. alta (Hall), Ohio, posterior and lateral views, X1 (Cooper, 1954b).
Synonyms
Geographic Distribution
eastern North America
Age Range
Beginning Stage in Treatise Usage:
Upper Devonian (Famennian)
Beginning International Stage:
Famennian
Fraction Up In Beginning Stage:
0
Beginning Date:
371.1
Ending Stage in Treatise Usage:
Upper Devonian (Famennian)
Ending International Stage:
Famennian
Fraction Up In Ending Stage:
100
Ending Date:
359.3
Description
Medium size, strongly ventribiconvex, transverse, with semiconical ventral valve, ventral interarea high, flat, catacline, sometimes with frills, delthyrium occluded by long delthyrial plate and stegidium, cardinal angles acute, fold and sulcus rounded, relatively narrow, surface tuberculate, dental plates long, divergent, ctenophoridium bilobed