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Hypagnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Spinagnostidae
Formal Genus Name and Reference:
Hypagnostus JAEKEL, 1909, p. 399
Type Species:
Agnostus parvifrons Linnarsson, 1869, p. 82, OD, lectotype (Linnarsson, 1869, pl. 2, fig. 56, SD WESTERGÅD, 1946, p. 116), 4769, SGU, Uppsala
Images
(Click to enlarge in a new window)
Fig. 226,5a,b. *H. parvifrons (LINNARSSON), Middle Cambrian (Hypagnostus parvifrons Zone), Sweden (Hällekis, Kinnekulle, Västergötland); a, lectotype, cephalon, SGU 4769, × 9; b, paralectotype, pygidium, SGU 4768, ×9 (new).
Synonyms
Spinagnostus
Geographic Distribution
Argentina; Sweden, Wales, H. parvifrons to L. laevigata Zones; England, H. parvifrons to A. pisiformis Zones; Norway, P. tessini to P. forchhammeri Zones; Denmark, P. tessini Zone; Czechoslovakia, P. (P.) gracilis Zone; USA (Vermont, New York), Bolaspidella Zone, (Alaska), late Dresbachian, (South Carolina), zone uncertain; Canada (Newfoundland, New Brunswick, Quebec), H. parvifrons Zone; Australia (Queensland, Tasmania), P. atavus to E. eretes Zones; China, H. parvifrons to G. stolidotus Zones; Russia (Salair, Altay, southeastern Siberia), Turkestan Mountain Range, Kazakhstan, P. atavus Zone, T. fissus or P. hicksi to L. laevigata or A. truncata Zones; Kazakhstan, K. simplex to G. reticulatus Zones.
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:
lower Upper Cambrian
Ending International Stage:
Fraction Up In Ending Stage:
0
Ending Date:
493.4
Description
Commonly weakly scrobiculate, Glabella with effaced anterior lobe, F3 bent forward, rounded or chevronate, posterior lobe short, variably ovate, with F2 weak or absent, glabellar node level with or slightly in front of F2 furrows, Pygidium usually nonspinose, axis usually long, broadly ogival or less commonly short and posteriorly rounded, Median postaxial furrow usually developed
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:
Spinagnostidae
Formal Genus Name and Reference:
Hypagnostus JAEKEL, 1909, p. 399
Type Species:
Agnostus parvifrons Linnarsson, 1869, p. 82, OD, lectotype (Linnarsson, 1869, pl. 2, fig. 56, SD WESTERGÅD, 1946, p. 116), 4769, SGU, Uppsala
Images
(Click to enlarge in a new window)
Fig. 226,5a,b. *H. parvifrons (LINNARSSON), Middle Cambrian (Hypagnostus parvifrons Zone), Sweden (Hällekis, Kinnekulle, Västergötland); a, lectotype, cephalon, SGU 4769, × 9; b, paralectotype, pygidium, SGU 4768, ×9 (new).
Synonyms
Spinagnostus
Geographic Distribution
Argentina; Sweden, Wales, H. parvifrons to L. laevigata Zones; England, H. parvifrons to A. pisiformis Zones; Norway, P. tessini to P. forchhammeri Zones; Denmark, P. tessini Zone; Czechoslovakia, P. (P.) gracilis Zone; USA (Vermont, New York), Bolaspidella Zone, (Alaska), late Dresbachian, (South Carolina), zone uncertain; Canada (Newfoundland, New Brunswick, Quebec), H. parvifrons Zone; Australia (Queensland, Tasmania), P. atavus to E. eretes Zones; China, H. parvifrons to G. stolidotus Zones; Russia (Salair, Altay, southeastern Siberia), Turkestan Mountain Range, Kazakhstan, P. atavus Zone, T. fissus or P. hicksi to L. laevigata or A. truncata Zones; Kazakhstan, K. simplex to G. reticulatus Zones.
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:
lower Upper Cambrian
Ending International Stage:
Fraction Up In Ending Stage:
0
Ending Date:
493.4
Description
Commonly weakly scrobiculate, Glabella with effaced anterior lobe, F3 bent forward, rounded or chevronate, posterior lobe short, variably ovate, with F2 weak or absent, glabellar node level with or slightly in front of F2 furrows, Pygidium usually nonspinose, axis usually long, broadly ogival or less commonly short and posteriorly rounded, Median postaxial furrow usually developed
References
Jaekel, O. 1909. Über die Agnostiden. Zeitschrift der Deutschen Geologischen Gesellschaft 61:380-401, 23 fig.