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Kormagnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Agnostidae
Formal Genus Name and Reference:
Kormagnostus RESSER, 1938, p. 49
Type Species:
K. simplex, OD, syntypes (RESSER, 1938, pl. 9, fig. 11-13), 94842, USNM, Washington, D.C.
Images
(Click to enlarge in a new window)
Fig. 220,4a,b. *K. simplex, Upper Cambrian (Dresbachian), USA (Rogersville district, Tennessee); a, syntype, cephalon, USNM 94842a, ×10; b, syntype, pygidium, USNM 94842b, × 10 (new).——Fig. 220,4c,d. K. seclusus (WALCOTT, 1884b), uppermost Middle Cambrian (Lejopyge laevigata Zone), northern Greenland (Gustav Holm Dal, Peary Land); c, cephalon, MGUH 17.158, × 12; d, pygidium, MGUH 17.165, ×8 (Robison, 1988, fig. 11.7,13).
Synonyms
Geographic Distribution
northern Greenland; USA (Alabama, Georgia, Missouri, Montana, Nevada, Tennessee, Texas, Utah, Wyoming), Bolaspidella to Crepicephalus Zones; Canada (Quebec, Northwest Territories), Cedaria minor-C. brevifrons Zones; Argentina, Bolaspidella Zone; Australia (Queensland), E. eretes Zone, (Tasmania), P. punctuosus to G. nathorsti Zones; China (Hunan, Guizhou), Paradamesops jimaensis or Cyclolorenzella Zone; Kazakhstan, K. simplex Zone.
Age Range
Beginning Stage in Treatise Usage:
uppermost Middle Cambrian
Beginning International Stage:
Fraction Up In Beginning Stage:
0
Beginning Date:
501.63
Ending Stage in Treatise Usage:
lower Upper Cambrian
Ending International Stage:
Fraction Up In Ending Stage:
0
Ending Date:
493.4
Description
Anterior glabellar lobe effaced, with deliquiate border furrow in cephalon and poorly defined, deliquiate border furrow and broad, flattened border in pygidium. Median preglabellar furrow absent. Glabella with straight F3, a broad, anteriorly tapering posterior lobe with weakly developed F2 furrows, a broadly rounded glabellar culmination, and with glabellar node immediately behind F2 furrows. Pygidial axis usually widest across posterior lobe with very slight constriction over M2, F1 and F2 effaced.
References
Resser, C. E., \& B. F. Howell. 1938. Lower Cambrian Olenellus Zone of the Appalachians. Geological Society of America, Bulletin 49:195-248, 13 pl .
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Agnostidae
Formal Genus Name and Reference:
Kormagnostus RESSER, 1938, p. 49
Type Species:
K. simplex, OD, syntypes (RESSER, 1938, pl. 9, fig. 11-13), 94842, USNM, Washington, D.C.
Images
(Click to enlarge in a new window)
Fig. 220,4a,b. *K. simplex, Upper Cambrian (Dresbachian), USA (Rogersville district, Tennessee); a, syntype, cephalon, USNM 94842a, ×10; b, syntype, pygidium, USNM 94842b, × 10 (new).——Fig. 220,4c,d. K. seclusus (WALCOTT, 1884b), uppermost Middle Cambrian (Lejopyge laevigata Zone), northern Greenland (Gustav Holm Dal, Peary Land); c, cephalon, MGUH 17.158, × 12; d, pygidium, MGUH 17.165, ×8 (Robison, 1988, fig. 11.7,13).
Synonyms
Geographic Distribution
northern Greenland; USA (Alabama, Georgia, Missouri, Montana, Nevada, Tennessee, Texas, Utah, Wyoming), Bolaspidella to Crepicephalus Zones; Canada (Quebec, Northwest Territories), Cedaria minor-C. brevifrons Zones; Argentina, Bolaspidella Zone; Australia (Queensland), E. eretes Zone, (Tasmania), P. punctuosus to G. nathorsti Zones; China (Hunan, Guizhou), Paradamesops jimaensis or Cyclolorenzella Zone; Kazakhstan, K. simplex Zone.
Age Range
Beginning Stage in Treatise Usage:
uppermost Middle Cambrian
Beginning International Stage:
Fraction Up In Beginning Stage:
0
Beginning Date:
501.63
Ending Stage in Treatise Usage:
lower Upper Cambrian
Ending International Stage:
Fraction Up In Ending Stage:
0
Ending Date:
493.4
Description
Anterior glabellar lobe effaced, with deliquiate border furrow in cephalon and poorly defined, deliquiate border furrow and broad, flattened border in pygidium. Median preglabellar furrow absent. Glabella with straight F3, a broad, anteriorly tapering posterior lobe with weakly developed F2 furrows, a broadly rounded glabellar culmination, and with glabellar node immediately behind F2 furrows. Pygidial axis usually widest across posterior lobe with very slight constriction over M2, F1 and F2 effaced.
References
Resser, C. E., \& B. F. Howell. 1938. Lower Cambrian Olenellus Zone of the Appalachians. Geological Society of America, Bulletin 49:195-248, 13 pl .