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Trilobagnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Agnostidae
Formal Genus Name and Reference:
Trilobagnostus HARRINGTON, 1938, p. 148
Type Species:
Agnostus innocens Clark, 1923b, p. 122, OD, holotype (Ludvigsen, Westrop, & Kindle, 1989, pl. 1, fig. 25), 1697, MCZ, Cambridge
Images
(Click to enlarge in a new window)
Fig. 217,5. *T. innocens (CLARK), uppermost Cambrian (Sunwaptan), Canada (Lévis, Quebec); holotype, pygidium, MCZ 1697, ×14 (Ludvigsen, Westrop, & Kindle, 1989).
Synonyms
Rudagnostus
Geographic Distribution
Wales, Sweden, Germany, Czech Republic, Poland, P. acutidens Zone–lower Tremadoc; Turkey, lower Tremadoc; China (Anhui, Guizhou, Hebei, Shanxi, Liaoning, Jilin, Zhejiang, Hunan), L. punctatus to Yosimuraspis Zones; South Korea, “Dictyites” Zone; Australia (Queensland), R. maximus or R. papilio Zone; Argentina, Bolivia, Colombia, N. argentina Zone; Mexico, C. proavus Zone; USA (Alaska, Montana, Nevada, Texas, Oklahoma, Vermont), Saratogia or Drumaspis to C. proavus Zones; Canada (Quebec, Newfoundland, British Columbia), Sunwaptan.
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:
Lower Ordovician (Tremadoc)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
0
Ending Date:
477.08
Description
Nonscrobiculate, unconstricted acrolobes, median preglabellar furrow generally absent. Glabella with straight or gently posteriorly curved F3, short posterior lobe with F2 usually absent, glabellar node level with F2 furrows. Pygidium widest at M1, F1 generally only impressed laterally, curving forward to isolate lateral lobes, posterior lobe relatively long (sag.), posterolateral spines retral.
References
Harrington, H. J. 1938. Sobre las faunas del ordoviciano inferior del norte Argentino. Revista del
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Agnostidae
Formal Genus Name and Reference:
Trilobagnostus HARRINGTON, 1938, p. 148
Type Species:
Agnostus innocens Clark, 1923b, p. 122, OD, holotype (Ludvigsen, Westrop, & Kindle, 1989, pl. 1, fig. 25), 1697, MCZ, Cambridge
Images
(Click to enlarge in a new window)
Fig. 217,5. *T. innocens (CLARK), uppermost Cambrian (Sunwaptan), Canada (Lévis, Quebec); holotype, pygidium, MCZ 1697, ×14 (Ludvigsen, Westrop, & Kindle, 1989).
Synonyms
Rudagnostus
Geographic Distribution
Wales, Sweden, Germany, Czech Republic, Poland, P. acutidens Zone–lower Tremadoc; Turkey, lower Tremadoc; China (Anhui, Guizhou, Hebei, Shanxi, Liaoning, Jilin, Zhejiang, Hunan), L. punctatus to Yosimuraspis Zones; South Korea, “Dictyites” Zone; Australia (Queensland), R. maximus or R. papilio Zone; Argentina, Bolivia, Colombia, N. argentina Zone; Mexico, C. proavus Zone; USA (Alaska, Montana, Nevada, Texas, Oklahoma, Vermont), Saratogia or Drumaspis to C. proavus Zones; Canada (Quebec, Newfoundland, British Columbia), Sunwaptan.
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:
Lower Ordovician (Tremadoc)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
0
Ending Date:
477.08
Description
Nonscrobiculate, unconstricted acrolobes, median preglabellar furrow generally absent. Glabella with straight or gently posteriorly curved F3, short posterior lobe with F2 usually absent, glabellar node level with F2 furrows. Pygidium widest at M1, F1 generally only impressed laterally, curving forward to isolate lateral lobes, posterior lobe relatively long (sag.), posterolateral spines retral.
References
Harrington, H. J. 1938. Sobre las faunas del ordoviciano inferior del norte Argentino. Revista del