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Pseudagnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Diplagnostidae
Formal Genus Name and Reference:
Pseudagnostus JAEKEL, 1909, p. 400
Type Species:
Agnostus cyclopyge Tullberg, 1880, p. 26, OD, topotypes (WESTERGÅRD, 1922, pl. 1, fig. 7-8), 3066t, 3067t, LO, Lund
Images
(Click to enlarge in a new window)
P. (Pseudagnostina) contracta (Palmer), Upper Cambrian (Dresbachian, Cedaria Zone), USA (Woodstock, Alabama), a, paratype, cephalon, USNM 143150, X16, b, holotype, pygidium, USNM 143151, X16 (Shergold, 1977, pl. 15, fig. 1112).
Synonyms
Plethagnostus Clark, 1923b, p. 124 (type, $P$. gyps, OD)
Geographic Distribution
Argentina; Antarctica; Vietnam; Afghanistan; Turkey; Spain; Sweden, England, O. cataractes to L. raphidophorus Zones; USA (Alaska, Montana, Wyoming, Nevada, Utah, Idaho, Texas, Oklahoma, Tennessee, Virginia, Maryland, Wisconsin), Canada (British Columbia, Alberta, Northwest Territories, Quebec), Cedaria to Ptychaspis or Prosaukia Zones, (Newfoundland), Sunwaptan; Australia (Queensland, Tasmania), E. eretes to P. tertia or P. quarta Zones; South Korea, Eochuangia Zone; Kazakhstan, Russia (northwestern Siberia, Yakutia), A. pisiformis to A. scrobicularis Zones; China (Zhejiang), G. stolidotus to L. punctatus Zones.
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
0
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
0
Ending Date:
486.85
Description
Variably convex, spectaculate pseudagnostines, en grande tenue to partly effaced, generally with wide borders, variably deliquiate border furrows, long (sag.), anteriorly rounded or pointed anterior glabellar lobe, simple, terminally angulate posterior lobe, prominent, triangular basal lobes, lateral lobes not well developed, pygidium weakly to strongly deuterolobate, occasionally trispinose.
References
Jaekel, O. 1909. Über die Agnostiden. Zeitschrift der Deutschen Geologischen Gesellschaft 61:380-401, 23 fig.
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Diplagnostidae
Formal Genus Name and Reference:
Pseudagnostus JAEKEL, 1909, p. 400
Type Species:
Agnostus cyclopyge Tullberg, 1880, p. 26, OD, topotypes (WESTERGÅRD, 1922, pl. 1, fig. 7-8), 3066t, 3067t, LO, Lund
Images
(Click to enlarge in a new window)
P. (Pseudagnostina) contracta (Palmer), Upper Cambrian (Dresbachian, Cedaria Zone), USA (Woodstock, Alabama), a, paratype, cephalon, USNM 143150, X16, b, holotype, pygidium, USNM 143151, X16 (Shergold, 1977, pl. 15, fig. 1112).
Synonyms
Plethagnostus Clark, 1923b, p. 124 (type, $P$. gyps, OD)
Geographic Distribution
Argentina; Antarctica; Vietnam; Afghanistan; Turkey; Spain; Sweden, England, O. cataractes to L. raphidophorus Zones; USA (Alaska, Montana, Wyoming, Nevada, Utah, Idaho, Texas, Oklahoma, Tennessee, Virginia, Maryland, Wisconsin), Canada (British Columbia, Alberta, Northwest Territories, Quebec), Cedaria to Ptychaspis or Prosaukia Zones, (Newfoundland), Sunwaptan; Australia (Queensland, Tasmania), E. eretes to P. tertia or P. quarta Zones; South Korea, Eochuangia Zone; Kazakhstan, Russia (northwestern Siberia, Yakutia), A. pisiformis to A. scrobicularis Zones; China (Zhejiang), G. stolidotus to L. punctatus Zones.
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
0
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
0
Ending Date:
486.85
Description
Variably convex, spectaculate pseudagnostines, en grande tenue to partly effaced, generally with wide borders, variably deliquiate border furrows, long (sag.), anteriorly rounded or pointed anterior glabellar lobe, simple, terminally angulate posterior lobe, prominent, triangular basal lobes, lateral lobes not well developed, pygidium weakly to strongly deuterolobate, occasionally trispinose.
References
Jaekel, O. 1909. Über die Agnostiden. Zeitschrift der Deutschen Geologischen Gesellschaft 61:380-401, 23 fig.