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Nahannagnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Diplagnostidae
Formal Genus Name and Reference:
Nahannagnostus PRATT, 1992, p. 35
Type Species:
Pseudagnostus nganasanicus Rozova, 1964, p. 27, OD, holotype (ROZOVA, 1964, pl. 16, fig. 3), 113/875, CSGM, Novosibirsk
Images
(Click to enlarge in a new window)
Fig. 234,1a,b. *N. nganasanicus (ROZOVA ), Upper Cambrian (Ayusokkanian, Nganasan Gorizont), Russia (Kulyumbe River, northwestern Siberian Platform); a, cephalon, CSGM 113/999, ×10; b, holotype, pygidium, CSGM 113/875, ×5 (Rozova, 1964, pl. 16, fig. 3, 11).
Synonyms
Geographic Distribution
Russia (Siberia), Ayusokkanian; Kazakhstan, Kormagnostus simplex Zone; Canada (Northwest Territories, Newfoundland), Cedaria selwyni to Cedaria brevifrons Zones; USA (Utah, Nevada, Missouri, Texas), Cedaria to Crepicephalus Zones; Australia (Queensland), Erediaspis eretes and Glyptagnostus stolidotus Zones; China (Hunan, Zhejiang), Glyptagnostus stolidotus Zone.
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
Cephalon and pygidium strongly convex, median preglabellar furrow well defined, anterior glabellar lobe extremely small, F3 partly effaced, axial glabellar node subcentral or slightly advanced. Pygidium with highly inflated deuterolobe, F1 and F2 mostly effaced, posterolateral spines minute.
References
Pratt, B. 1992. Trilobites of the Marjuman and Steptoean Stages (Upper Cambrian), Rabbitkettle Formation, southern Mackenzie Mountains, northwest Canada. Palaeontographica Canadiana 9:1-179, 34 pl .
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Diplagnostidae
Formal Genus Name and Reference:
Nahannagnostus PRATT, 1992, p. 35
Type Species:
Pseudagnostus nganasanicus Rozova, 1964, p. 27, OD, holotype (ROZOVA, 1964, pl. 16, fig. 3), 113/875, CSGM, Novosibirsk
Images
(Click to enlarge in a new window)
Fig. 234,1a,b. *N. nganasanicus (ROZOVA ), Upper Cambrian (Ayusokkanian, Nganasan Gorizont), Russia (Kulyumbe River, northwestern Siberian Platform); a, cephalon, CSGM 113/999, ×10; b, holotype, pygidium, CSGM 113/875, ×5 (Rozova, 1964, pl. 16, fig. 3, 11).
Synonyms
Geographic Distribution
Russia (Siberia), Ayusokkanian; Kazakhstan, Kormagnostus simplex Zone; Canada (Northwest Territories, Newfoundland), Cedaria selwyni to Cedaria brevifrons Zones; USA (Utah, Nevada, Missouri, Texas), Cedaria to Crepicephalus Zones; Australia (Queensland), Erediaspis eretes and Glyptagnostus stolidotus Zones; China (Hunan, Zhejiang), Glyptagnostus stolidotus Zone.
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
Cephalon and pygidium strongly convex, median preglabellar furrow well defined, anterior glabellar lobe extremely small, F3 partly effaced, axial glabellar node subcentral or slightly advanced. Pygidium with highly inflated deuterolobe, F1 and F2 mostly effaced, posterolateral spines minute.
References
Pratt, B. 1992. Trilobites of the Marjuman and Steptoean Stages (Upper Cambrian), Rabbitkettle Formation, southern Mackenzie Mountains, northwest Canada. Palaeontographica Canadiana 9:1-179, 34 pl .