Agnostida

Hadragnostus modestus

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ammagnostidae

Cambrian, Miaolingian, GuzhangianHunan, Yunnan, Liaoning, Jiangsu; USA, Australia, Iran

Hadragnostus modestus — photo 1 — Photo 1 · genus name. Pygidium holotype (USA; Lochman (Iran; Fortey et al., 1976) (Hunan; Peng Shanchi 2020) et al., 1944) (Yunnan; Amazon) (Yunnan; Y.W)

Hadragnostus modestus — photo 2 — Photo 2 · genus name. Pygidium holotype (USA; Lochman (Iran; Fortey et al., 1976) (Hunan; Peng Shanchi 2020) et al., 1944) (Yunnan; Amazon) (Yunnan; Y.W)

Hadragnostus modestus — photo 3 — Photo 3 · genus name. Pygidium holotype (USA; Lochman (Iran; Fortey et al., 1976) (Hunan; Peng Shanchi 2020) et al., 1944) (Yunnan; Amazon) (Yunnan; Y.W)

Hadragnostus modestus — photo 4 — Photo 4 · genus name. Pygidium holotype (USA; Lochman (Iran; Fortey et al., 1976) (Hunan; Peng Shanchi 2020) et al., 1944) (Yunnan; Amazon) (Yunnan; Y.W)

Hadragnostus modestus — photo 5 — Photo 5 · genus name. Pygidium holotype (USA; Lochman (Iran; Fortey et al., 1976) (Hunan; Peng Shanchi 2020) et al., 1944) (Yunnan; Amazon) (Yunnan; Y.W)

Classification

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ammagnostidae

Genus

Hadragnostus

Genus author

Ö pik A. A.

Genus etymology

hadr-, Greek, stout, massive, referring to the shape of the glabella and the pygidial axis; Agnostus, a trilobite

Species

H. modestus (Lochman in Lochman & Duncan, 1944)

Species author

Lochman C.

Species etymology

modestus, moderate.

Age

Cambrian, Miaolingian, Guzhangian

Distribution

Hunan, Yunnan, Liaoning, Jiangsu; USA, Australia, Iran

Synonyms

Proagnostus modestus; Homagnostus convexus; Hadragnostus las; Hadragnostus edax; Formosagnostus formosus Formosagnostus convexus; Formosagnostus latus; Kunshanagnostus kunshanensis; Hadragnostus convexus

Diagnosis

Cephalon and pygidium subsemicircular, border furrow broad and deep. Glabellar frontal lobe subhexagonal, anterior end pointed; posterior part of glabellar posterior lobe strongly convex, terminal end rounded, median node weak; preglabellar median furrow deep and complete. Pygidial axis broad, anterior axial ring subparallel-sided, median node crossing F2 to the front of the posterior axial ring; posterior axial ring convex, inflated globular, posterior margin extending to the border furrow; with a pair of small lateral spines.

Remarks

Typical body length about 0.2-1.2 cm.