Agnostida

Pseudagnostus idalis

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Diplagnostidae

Cambrian, Furongian PaibianHunan; Australia

Pseudagnostus idalis — photo 1 — Photo 1 · Pygidium is the holotype Illustrated CPC5908 specimen s (Australia; Öpik 1967) (Australia; Jago et al., 1992) Illustrated specimens (Hunan; Peng Complete Shanchi 2020) dorsal shield (Hunan; Lixia)

Pseudagnostus idalis — photo 2 — Photo 2 · Pygidium is the holotype Illustrated CPC5908 specimen s (Australia; Öpik 1967) (Australia; Jago et al., 1992) Illustrated specimens (Hunan; Peng Complete Shanchi 2020) dorsal shield (Hunan; Lixia)

Pseudagnostus idalis — photo 3 — Photo 3 · Pygidium is the holotype Illustrated CPC5908 specimen s (Australia; Öpik 1967) (Australia; Jago et al., 1992) Illustrated specimens (Hunan; Peng Complete Shanchi 2020) dorsal shield (Hunan; Lixia)

Pseudagnostus idalis — photo 4 — Photo 4 · Pygidium is the holotype Illustrated CPC5908 specimen s (Australia; Öpik 1967) (Australia; Jago et al., 1992) Illustrated specimens (Hunan; Peng Complete Shanchi 2020) dorsal shield (Hunan; Lixia)

Pseudagnostus idalis — photo 5 — Photo 5 · Pygidium is the holotype Illustrated CPC5908 specimen s (Australia; Öpik 1967) (Australia; Jago et al., 1992) Illustrated specimens (Hunan; Peng Complete Shanchi 2020) dorsal shield (Hunan; Lixia)

Pseudagnostus idalis — photo 6 — Photo 6 · Pygidium is the holotype Illustrated CPC5908 specimen s (Australia; Öpik 1967) (Australia; Jago et al., 1992) Illustrated specimens (Hunan; Peng Complete Shanchi 2020) dorsal shield (Hunan; Lixia)

Classification

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Diplagnostidae

Genus

Pseudagnostus Jaekel, 1909

Genus author

Jaekel O.

Genus etymology

pseud-, Greek, false; Agnostus, a trilobite genus name.

Species

P. idalis Öpik, 1967

Species author

Ö pik A. A.

Species etymology

idalis, Latin, abbreviated from idamealis, referring to its occurrence in the Idamean (an Australian chronostratigraphic unit whose base corresponds to the Paibian)

Age

Cambrian, Furongian Paibian

Distribution

Hunan; Australia

Synonyms

Pseudagnostus(Pseudagnostus)idalis idalis; Pseudagnostus(Pseudagnostus)idalis huskissonensis Pseudagnostus idalis transversus

Diagnosis

Border furrows of cephalon and pygidium broad and deep, border narrow, ridge-like and upturned. Glabellar frontal lobe subrectangular, anterior end flatly rounded, F3 slightly curved backward; posterior end of glabella bluntly pointed, median node long; dorsal furrow deep; preglabellar median furrow broad and deep; basal lobe triangular. Anterior and posterior axial rings of the pygidium distinct, F2 slightly extending backward, axial node long; border with a pair of small lateral spines.