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Lejopyge
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Ptychagnostidae
Formal Genus Name and Reference:
Lejopyge Hawle & Corda, 1847, p. 51, Miagnostus Jaekel, 1909, p. 401, Pseudophalacroma POКROVSKAYA, 1958, p. 79
Type Species:
Battus laevigatus Dalman, 1828, sensu Jaekel, 1909, p. 401, fig. 21, Miagnostus Jaekel, 1909, p. 401 (type, Battus laevigatus Dalman, 1828, sensu Jaekel, 1909, p. 401, fig. 21), Pseudophalacroma Poкrovskaya, 1958, p. 79 (type, P. creba POKROVSKAYA, 1958, p. 79, pl. 3, fig. 4-6)
Images
(Click to enlarge in a new window)
Fig. 224,5a,b. *L. laevigata (DALMAN ), Middle Cambrian (Lejopyge laevigata Zone), Sweden (Kinnekulle, Västergötland); a, paralectotype, pygidium, RM Ar 287a, × 12; b, lectotype, cephalon, RM Ar 287b, ×12 (new).
Synonyms
Miagnostus
Geographic Distribution
upper Middle Cambrian: Sweden, Norway, Denmark, P. punctuosus to L. laevigata Zones; Australia (Queensland, Tasmania), P. punctuosus to C. quasivespa Zones; England, P. forchhammeri Zone; Kazakhstan, Uzbekistan, L. armata to L. laevigata Zones, H. brevifrons beds; Russia (Siberian Platform), L. lundgreni Subzone to L. laevigata or A. truncata Zone; China (Zhejiang), P. triangularis to L. sinensis Zones, (Guizhou), L. laevigata Zone, (Hunan), L. laevigata, Paramphoton Zone; USA (New York), Bolaspidella Zone, (Utah, Nevada), P. punctuosus to L. laevigata Zones; Greenland, L. laevigata Zone; Canada (Newfoundland, Northwest Territories), Cedaria minor Zone. Middle Cambrian: Alaska; China (Qinghai); ? Argentina.
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:
upper Middle Cambrian
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
0
Ending Date:
498.75
Description
Strongly convex, with very narrow cephalic border, en grande tenue to largely effaced, uncommonly scrobiculate, prosopon smooth, variably spinose. Anterior glabellar lobe narrow, subtriangular, posterior glabellar lobe with F2 furrows usually absent, glabellar node midway between F1 and F2, basal lobes small, simple. Pygidial axis with small node on M2 slightly deflecting F2 furrow rearward.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Ptychagnostidae
Formal Genus Name and Reference:
Lejopyge Hawle & Corda, 1847, p. 51, Miagnostus Jaekel, 1909, p. 401, Pseudophalacroma POКROVSKAYA, 1958, p. 79
Type Species:
Battus laevigatus Dalman, 1828, sensu Jaekel, 1909, p. 401, fig. 21, Miagnostus Jaekel, 1909, p. 401 (type, Battus laevigatus Dalman, 1828, sensu Jaekel, 1909, p. 401, fig. 21), Pseudophalacroma Poкrovskaya, 1958, p. 79 (type, P. creba POKROVSKAYA, 1958, p. 79, pl. 3, fig. 4-6)
Images
(Click to enlarge in a new window)
Fig. 224,5a,b. *L. laevigata (DALMAN ), Middle Cambrian (Lejopyge laevigata Zone), Sweden (Kinnekulle, Västergötland); a, paralectotype, pygidium, RM Ar 287a, × 12; b, lectotype, cephalon, RM Ar 287b, ×12 (new).
Synonyms
Miagnostus
Geographic Distribution
upper Middle Cambrian: Sweden, Norway, Denmark, P. punctuosus to L. laevigata Zones; Australia (Queensland, Tasmania), P. punctuosus to C. quasivespa Zones; England, P. forchhammeri Zone; Kazakhstan, Uzbekistan, L. armata to L. laevigata Zones, H. brevifrons beds; Russia (Siberian Platform), L. lundgreni Subzone to L. laevigata or A. truncata Zone; China (Zhejiang), P. triangularis to L. sinensis Zones, (Guizhou), L. laevigata Zone, (Hunan), L. laevigata, Paramphoton Zone; USA (New York), Bolaspidella Zone, (Utah, Nevada), P. punctuosus to L. laevigata Zones; Greenland, L. laevigata Zone; Canada (Newfoundland, Northwest Territories), Cedaria minor Zone. Middle Cambrian: Alaska; China (Qinghai); ? Argentina.
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:
upper Middle Cambrian
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
0
Ending Date:
498.75
Description
Strongly convex, with very narrow cephalic border, en grande tenue to largely effaced, uncommonly scrobiculate, prosopon smooth, variably spinose. Anterior glabellar lobe narrow, subtriangular, posterior glabellar lobe with F2 furrows usually absent, glabellar node midway between F1 and F2, basal lobes small, simple. Pygidial axis with small node on M2 slightly deflecting F2 furrow rearward.