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Prosaukia
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Ptychaspidacea
Family:
Saukiidae
Formal Genus Name and Reference:
Prosaukia ULRICH & RESSER, 1933
Type Species:
Dikelocephailis misa HALL, 1863
Images
(Click to enlarge in a new window)
Fig. 239, 4. "P. misa (HALL), Francon., Wis.; 4a,b, ceph., pyg., X I.3 (461 mod.; 487 mod.)
Synonyms
Stenosaukia
Geographic Distribution
North America, Northeast Asia
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian(Francon.)
Beginning International Stage:
Paibian
Fraction Up In Beginning Stage:
0
Beginning Date:
494.95
Ending Stage in Treatise Usage:
Upper Cambrian(Trempeal.)
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
0
Ending Date:
486.85
Description
Glabella low, quadrate to rectangular, sides converging slightly, front nearly straight, with 2 pairs of distinct lateral furrows, posterior pair complete; occipital spine may be present; eye ridges faint, preglabellar field present, narrow anterior border furrow distinct, anterior border narrow, fixigenae with posterior areas almost 0.5 of length of occipital ring; librigenae with medium-Iength genal spines, posterior border furrows running into spine bases, not meeting lateral furrows. Pygidium transverse elliptical, lateral margins curving abruptly backward, posterior margin slightly curved with median flattening; axis convex, slightly wider than pleural fields, tapering 0.75 of length, with narrow postaxial ridge extending to margin, 3 or 4 axial rings and terminal with one faint ring; pleural fields low, merging into concave border of variable width, 4 (rarely 5) pairs of interpleural grooves and 5 parallel, evenly spaced pleural furrows crossing border nearly to margin. Surface smooth or granulose.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Ptychaspidacea
Family:
Saukiidae
Formal Genus Name and Reference:
Prosaukia ULRICH & RESSER, 1933
Type Species:
Dikelocephailis misa HALL, 1863
Images
(Click to enlarge in a new window)
Fig. 239, 4. "P. misa (HALL), Francon., Wis.; 4a,b, ceph., pyg., X I.3 (461 mod.; 487 mod.)
Synonyms
Stenosaukia
Geographic Distribution
North America, Northeast Asia
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian(Francon.)
Beginning International Stage:
Paibian
Fraction Up In Beginning Stage:
0
Beginning Date:
494.95
Ending Stage in Treatise Usage:
Upper Cambrian(Trempeal.)
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
0
Ending Date:
486.85
Description
Glabella low, quadrate to rectangular, sides converging slightly, front nearly straight, with 2 pairs of distinct lateral furrows, posterior pair complete; occipital spine may be present; eye ridges faint, preglabellar field present, narrow anterior border furrow distinct, anterior border narrow, fixigenae with posterior areas almost 0.5 of length of occipital ring; librigenae with medium-Iength genal spines, posterior border furrows running into spine bases, not meeting lateral furrows. Pygidium transverse elliptical, lateral margins curving abruptly backward, posterior margin slightly curved with median flattening; axis convex, slightly wider than pleural fields, tapering 0.75 of length, with narrow postaxial ridge extending to margin, 3 or 4 axial rings and terminal with one faint ring; pleural fields low, merging into concave border of variable width, 4 (rarely 5) pairs of interpleural grooves and 5 parallel, evenly spaced pleural furrows crossing border nearly to margin. Surface smooth or granulose.