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Calvinella
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Ptychaspidacea
Family:
Saukiidae
Formal Genus Name and Reference:
Calvinella WALCOTT, 1914
Type Species:
Dikelocephalus spiniger HALL, 1863
Images
(Click to enlarge in a new window)
Fig. 239,2. *C. spiniger (HALL), Trempeal.; Wis.; 2a, ceph., x1, 2b, pyg., x1 ( 461 mod., 487 mod.)
Synonyms
Geographic Distribution
North America, Northeast Asia
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian(Francon.-Trempeal.)
Beginning International Stage:
Paibian
Fraction Up In Beginning Stage:
0
Beginning Date:
494.95
Ending Stage in Treatise Usage:
Upper Cambrian(Francon.-Trempeal.)
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
0
Ending Date:
486.85
Description
Glabella low, rectangular, sides converging slightly to straight squared front, posterior glabellar furrows usually complete, 2nd pair short, faint, slender occipital spine, preglabellar field absent, anterior border furrow diagonal at sides to corners of glabella, convex anterior border narrow, fixigenae narrow, with posterior areas 0.75 of length (tr.) of occipital ring, librigenae with posterior and lateral border furrows fading into base of medium-length genal spines. Pygidium nearly circular, axis narrow, same in width as pleural fields, convex, tapered rapidly 0.5 of length, with narrow postaxial ridge fading on to border, 3 axial rings and terminal with one faint ring, pleural fields low, merging into medium to broad concave border, 4 pairs of interpleural grooves, 5 pairs of pleural furrows close to anterior edge of each segment, may touch interpleural grooves on edge of border, posterior margin may bend inward on median line. Surface granulose. Upper Cambrian(Francon.-Trempeal.), N.Am.-NE.Asia.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Ptychaspidacea
Family:
Saukiidae
Formal Genus Name and Reference:
Calvinella WALCOTT, 1914
Type Species:
Dikelocephalus spiniger HALL, 1863
Images
(Click to enlarge in a new window)
Fig. 239,2. *C. spiniger (HALL), Trempeal.; Wis.; 2a, ceph., x1, 2b, pyg., x1 ( 461 mod., 487 mod.)
Synonyms
Geographic Distribution
North America, Northeast Asia
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian(Francon.-Trempeal.)
Beginning International Stage:
Paibian
Fraction Up In Beginning Stage:
0
Beginning Date:
494.95
Ending Stage in Treatise Usage:
Upper Cambrian(Francon.-Trempeal.)
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
0
Ending Date:
486.85
Description
Glabella low, rectangular, sides converging slightly to straight squared front, posterior glabellar furrows usually complete, 2nd pair short, faint, slender occipital spine, preglabellar field absent, anterior border furrow diagonal at sides to corners of glabella, convex anterior border narrow, fixigenae narrow, with posterior areas 0.75 of length (tr.) of occipital ring, librigenae with posterior and lateral border furrows fading into base of medium-length genal spines. Pygidium nearly circular, axis narrow, same in width as pleural fields, convex, tapered rapidly 0.5 of length, with narrow postaxial ridge fading on to border, 3 axial rings and terminal with one faint ring, pleural fields low, merging into medium to broad concave border, 4 pairs of interpleural grooves, 5 pairs of pleural furrows close to anterior edge of each segment, may touch interpleural grooves on edge of border, posterior margin may bend inward on median line. Surface granulose. Upper Cambrian(Francon.-Trempeal.), N.Am.-NE.Asia.