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Dividuagnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Metagnostidae
Formal Genus Name and Reference:
Dividuagnostus Koroleva, 1982, p. 21, Peziziopsis Ju in Qiu & OTHERS, 1983, p. 29
Type Species:
* D. minus, OD, holotype (KOROLEVA, 1982, pl. 1, fig. 5), 1-358, KazIMS, Alma-Ata
Images
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Fig. 237,3. D. mccoyi (SALTER), middle Ordovician (upper Llandeilo), central Wales (Pen-Cerig Lake, Builth-Llandrindod area); exoskeleton, BMNH It 2671, × 5 (C. P. Hughes, 1969, pl. 1, fig. 3).
Synonyms
Peziziopsis
Geographic Distribution
Kazakhstan, middle Ordovician; China (Zhejiang), ?Tremadoc, lower Ashgill, (Gansu), Caradoc–Ashgill, (Jiangxi), upper Caradoc; Wales, middle Arenig, Llandeilo–lower Caradoc; England, lower Llandeilo; Australia (New South Wales), upper Gisbornian–lower Eastonian; ? Canada (Newfoundland), Tremadoc.
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
Upper Ordovician
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
0
Ending Date:
443.07
Description
Glabella with bulbous, subcircular anterior lobe, F3 strong, chevronate, posterior lobe subcircular, lacking F2, glabellar node from a short distance behind to immediately behind F3 furrow. Pygidial axis short, with well-developed constriction across M2, posterior lobe nearly equidimensional, semiovate to subrectangular, without terminal node.
References
Koroleva, M. N. 1982. Trilobity Ordovika severovostochnogo Kazakhstana. Nedra. Moscow. 192 p., 26 pl .