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Ptychagnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Ptychagnostidae
Formal Genus Name and Reference:
Ptychagnostus JAEKEL, 1909, p. 401
Type Species:
Agnostus punctuosus Angelin, 1851, p. 8, OD (publication date discussed by Shergold & Laurie, 1991), lectotype (SD WESTERGARD, 1946, p. 78, pl. 12, fig. 3a, b), Ar 9539, RM, Stockholm
Images
(Click to enlarge in a new window)
.png)
Fig. 223,1a,b. *P. punctuosus (ANGELIN), Middle Cambrian (Ptychagnostus punctuosus Zone), Sweden (Andrarum, Skåne); a, lectotype, cephalon, RM Ar 9539, × 8; b, paralectotype, pygidium, RM Ar 9540, ×8 (new).
Synonyms
Geographic Distribution
Argentina; China (Liaoning); Sweden, Denmark, Norway, uppermost H. parvifrons to P. punctuosus Zones; Australia (Queensland), P. punctuosus to D. notalibrae Zones; Kazakhstan, P. punctuosus Zone; Russia (Siberian Platform), A. henrici Zone; England, Canada (Newfoundland), P. davidis Zone; USA (Utah, Nevada), A. atavus to P. punctuosus Zones, (New York), Bolaspidella Zone.
Age Range
Beginning Stage in Treatise Usage:
Middle Cambrian
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
512.3
Ending Stage in Treatise Usage:
Middle Cambrian
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
0
Ending Date:
498.75
Description
Scrobiculate, prosopon finely granulose or pustulose. Anterior glabellar lobe semiovate, posterior glabellar lobe evenly convex, with F2 furrows well developed, glabellar node slightly behind to slightly in front of F2 furrow, basal lobes divided or entire. Pygidium nonspinose, axis with small node on M2, median postaxial furrow present.
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:
Ptychagnostidae
Formal Genus Name and Reference:
Ptychagnostus JAEKEL, 1909, p. 401
Type Species:
Agnostus punctuosus Angelin, 1851, p. 8, OD (publication date discussed by Shergold & Laurie, 1991), lectotype (SD WESTERGARD, 1946, p. 78, pl. 12, fig. 3a, b), Ar 9539, RM, Stockholm
Images
(Click to enlarge in a new window)
Fig. 223,1a,b. *P. punctuosus (ANGELIN), Middle Cambrian (Ptychagnostus punctuosus Zone), Sweden (Andrarum, Skåne); a, lectotype, cephalon, RM Ar 9539, × 8; b, paralectotype, pygidium, RM Ar 9540, ×8 (new).
Synonyms
Geographic Distribution
Argentina; China (Liaoning); Sweden, Denmark, Norway, uppermost H. parvifrons to P. punctuosus Zones; Australia (Queensland), P. punctuosus to D. notalibrae Zones; Kazakhstan, P. punctuosus Zone; Russia (Siberian Platform), A. henrici Zone; England, Canada (Newfoundland), P. davidis Zone; USA (Utah, Nevada), A. atavus to P. punctuosus Zones, (New York), Bolaspidella Zone.
Age Range
Beginning Stage in Treatise Usage:
Middle Cambrian
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
512.3
Ending Stage in Treatise Usage:
Middle Cambrian
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
0
Ending Date:
498.75
Description
Scrobiculate, prosopon finely granulose or pustulose. Anterior glabellar lobe semiovate, posterior glabellar lobe evenly convex, with F2 furrows well developed, glabellar node slightly behind to slightly in front of F2 furrow, basal lobes divided or entire. Pygidium nonspinose, axis with small node on M2, median postaxial furrow present.
References
Jaekel, O. 1909. Über die Agnostiden. Zeitschrift der Deutschen Geologischen Gesellschaft 61:380-401, 23 fig.