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Quadrahomagnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Agnostidae
Formal Genus Name and Reference:
Quadrahomagnostus CHU, 1959, p. 91
Type Species:
Homagnostus (Quadrahomagnostus) subquadratus, OD, holotype (CHU, 1959, pl. 1, fig. 21), 9429, NIGP, Nanjing
Images
(Click to enlarge in a new window)
Fig. 222,5a,b. Q. subquadratus (ZHU), Upper Cambrian (Gushanian); a, paratype, pygidium, NIGP 9431, China (Wutingshan, Yentai, Liaoning), Drepanura premesnili Zone, ×10; b, holotype, cephalon, NIGP 9429, China (Yaobao, Tienshihfu, Liaoning), Blackwelderia paronai Zone, ×10 (Chu, 1959, pl. 1, fig. 21, 23).
Synonyms
Geographic Distribution
China (Henan, Liaoning), B. paronai to D. premesnili Zones.
Age Range
Beginning Stage in Treatise Usage:
lower Upper Cambrian
Beginning International Stage:
Fraction Up In Beginning Stage:
0
Beginning Date:
498.75
Ending Stage in Treatise Usage:
lower Upper Cambrian
Ending International Stage:
Fraction Up In Ending Stage:
0
Ending Date:
493.4
Description
Nonscrobiculate, median preglabellar furrow very weak to absent. Glabella with small to moderatesized, subrhombic to subcircular anterior lobe, F3 curved strongly rearward, F2 effaced or weakly impressed, crossing glabella, and curved forward, glabellar node immediately behind F2 furrow, glabellar culmination narrowly rounded to angular, basal lobes of moderate to large size. Pygidial axis long, parallel-sided or expanding slightly rearwards, nearly reaching border furrow. Unassigned because of glabellar characteristics.
References
Chu, Chaoling [see also Zhu, Zhaoling]. 1959. Trilo-
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Agnostidae
Formal Genus Name and Reference:
Quadrahomagnostus CHU, 1959, p. 91
Type Species:
Homagnostus (Quadrahomagnostus) subquadratus, OD, holotype (CHU, 1959, pl. 1, fig. 21), 9429, NIGP, Nanjing
Images
(Click to enlarge in a new window)
Fig. 222,5a,b. Q. subquadratus (ZHU), Upper Cambrian (Gushanian); a, paratype, pygidium, NIGP 9431, China (Wutingshan, Yentai, Liaoning), Drepanura premesnili Zone, ×10; b, holotype, cephalon, NIGP 9429, China (Yaobao, Tienshihfu, Liaoning), Blackwelderia paronai Zone, ×10 (Chu, 1959, pl. 1, fig. 21, 23).
Synonyms
Geographic Distribution
China (Henan, Liaoning), B. paronai to D. premesnili Zones.
Age Range
Beginning Stage in Treatise Usage:
lower Upper Cambrian
Beginning International Stage:
Fraction Up In Beginning Stage:
0
Beginning Date:
498.75
Ending Stage in Treatise Usage:
lower Upper Cambrian
Ending International Stage:
Fraction Up In Ending Stage:
0
Ending Date:
493.4
Description
Nonscrobiculate, median preglabellar furrow very weak to absent. Glabella with small to moderatesized, subrhombic to subcircular anterior lobe, F3 curved strongly rearward, F2 effaced or weakly impressed, crossing glabella, and curved forward, glabellar node immediately behind F2 furrow, glabellar culmination narrowly rounded to angular, basal lobes of moderate to large size. Pygidial axis long, parallel-sided or expanding slightly rearwards, nearly reaching border furrow. Unassigned because of glabellar characteristics.
References
Chu, Chaoling [see also Zhu, Zhaoling]. 1959. Trilo-