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Aistagnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Agnostidae
Formal Genus Name and Reference:
Aistagnostus Xiang & ZHANG, 1985, p. 68
Type Species:
* A. laevigatus, OD, holotype (XIANG & ZHANG, 1985, pl. 6, fig. 1a, b), T1415a, CAGC, Beijing
Images
(Click to enlarge in a new window)
Fig. 222,6a,b. *A. laevigatus; a, paratype, cephalon, CAGC T1415a, × 12; b, holotype, pygidium, CAGC T1415b, × 12 (Xiang & Zhang, 1985, pl. 6, fig. 1a,b).
Synonyms
Geographic Distribution
China (Xinjiang), Agnostotes tianshanicus Zone.
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian (Changshanian)
Beginning International Stage:
Paibian
Fraction Up In Beginning Stage:
0
Beginning Date:
494.95
Ending Stage in Treatise Usage:
Upper Cambrian (Changshanian)
Ending International Stage:
Jiangshanian
Fraction Up In Ending Stage:
0
Ending Date:
491.4
Description
Small, en grande tenue, with axial furrows weakly impressed and nondeliquiate border furrows, Anterior glabellar lobe short, broad, subpentagonal, Posterior glabellar lobe short, broad, with median node at midlength, Basal lobes simple, Median preglabellar furrow absent, Pygidial axis short, broad, posteriorly rounded, tripartite, with transverse furrows weakly impressed, Median postaxial furrow absent, Pygidial marginal spines small, Possibly belongs to Agnostinae.
References
Xiang, Liwen, \& Tairong Zhang. 1985. Stratigraphy and trilobite faunas of the Cambrian in the western part of northern Tianshan, Xinjiang. Ministry of Geology and Mineral Resources, Geological Memoirs (series 2) 4:1-243, fig. 1-30, pl. 1-52, table 1-6.
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Agnostidae
Formal Genus Name and Reference:
Aistagnostus Xiang & ZHANG, 1985, p. 68
Type Species:
* A. laevigatus, OD, holotype (XIANG & ZHANG, 1985, pl. 6, fig. 1a, b), T1415a, CAGC, Beijing
Images
(Click to enlarge in a new window)
Fig. 222,6a,b. *A. laevigatus; a, paratype, cephalon, CAGC T1415a, × 12; b, holotype, pygidium, CAGC T1415b, × 12 (Xiang & Zhang, 1985, pl. 6, fig. 1a,b).
Synonyms
Geographic Distribution
China (Xinjiang), Agnostotes tianshanicus Zone.
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian (Changshanian)
Beginning International Stage:
Paibian
Fraction Up In Beginning Stage:
0
Beginning Date:
494.95
Ending Stage in Treatise Usage:
Upper Cambrian (Changshanian)
Ending International Stage:
Jiangshanian
Fraction Up In Ending Stage:
0
Ending Date:
491.4
Description
Small, en grande tenue, with axial furrows weakly impressed and nondeliquiate border furrows, Anterior glabellar lobe short, broad, subpentagonal, Posterior glabellar lobe short, broad, with median node at midlength, Basal lobes simple, Median preglabellar furrow absent, Pygidial axis short, broad, posteriorly rounded, tripartite, with transverse furrows weakly impressed, Median postaxial furrow absent, Pygidial marginal spines small, Possibly belongs to Agnostinae.
References
Xiang, Liwen, \& Tairong Zhang. 1985. Stratigraphy and trilobite faunas of the Cambrian in the western part of northern Tianshan, Xinjiang. Ministry of Geology and Mineral Resources, Geological Memoirs (series 2) 4:1-243, fig. 1-30, pl. 1-52, table 1-6.