Agnostida

Pseudagnostus koerferi

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Diplagnostidae

Cambrian, Miaolingian, GuzhangianShandong, Hunan

Pseudagnostus koerferi — photo 1 — Photo 1 · Cephalon is the holotype NIGP 123728, 123725, 123727, 123726, 123734 (Hunan; Peng Shanchi 2020) (Shandong; Lu Yanhao et al. 1965) Enrolled specimen (Shandong; Tang Shi) Complete dorsal shield and enlarged view (lower right wet Ventral compression of complete photograph, Shandong; Chenai) dorsal shield (Shandong; Baishui)

Pseudagnostus koerferi — photo 2 — Photo 2 · Cephalon is the holotype NIGP 123728, 123725, 123727, 123726, 123734 (Hunan; Peng Shanchi 2020) (Shandong; Lu Yanhao et al. 1965) Enrolled specimen (Shandong; Tang Shi) Complete dorsal shield and enlarged view (lower right wet Ventral compression of complete photograph, Shandong; Chenai) dorsal shield (Shandong; Baishui)

Pseudagnostus koerferi — photo 3 — Photo 3 · Cephalon is the holotype NIGP 123728, 123725, 123727, 123726, 123734 (Hunan; Peng Shanchi 2020) (Shandong; Lu Yanhao et al. 1965) Enrolled specimen (Shandong; Tang Shi) Complete dorsal shield and enlarged view (lower right wet Ventral compression of complete photograph, Shandong; Chenai) dorsal shield (Shandong; Baishui)

Pseudagnostus koerferi — photo 4 — Photo 4 · Cephalon is the holotype NIGP 123728, 123725, 123727, 123726, 123734 (Hunan; Peng Shanchi 2020) (Shandong; Lu Yanhao et al. 1965) Enrolled specimen (Shandong; Tang Shi) Complete dorsal shield and enlarged view (lower right wet Ventral compression of complete photograph, Shandong; Chenai) dorsal shield (Shandong; Baishui)

Pseudagnostus koerferi — photo 5 — Photo 5 · Cephalon is the holotype NIGP 123728, 123725, 123727, 123726, 123734 (Hunan; Peng Shanchi 2020) (Shandong; Lu Yanhao et al. 1965) Enrolled specimen (Shandong; Tang Shi) Complete dorsal shield and enlarged view (lower right wet Ventral compression of complete photograph, Shandong; Chenai) dorsal shield (Shandong; Baishui)

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. koerferi (Monke, 1903)

Species author

Monke H.

Species etymology

Koerfer, a surname.

Age

Cambrian, Miaolingian, Guzhangian

Distribution

Shandong, Hunan

Synonyms

Agnostus koerferi; ? P. nordicus; P. contracta; ? P. kobayashii; Oedorhachis boltonensis; Pseudagnostus (Pseudagnostina) contracta; ?P. (P.) pseudodouvillei

Diagnosis

Glabellar frontal lobe subsemicircular; glabellar posterior lobe cylindrical, posterior end rounded, median node weak; basal lobe small, triangular; no preglabellar median furrow. Pygidial axis broad, median node short; posterior axial ring large, dorsal furrow short and shallow, posterior part merged with the pleural lobe; posterolateral margin with a pair of small posterolateral spines. Typical body length about 0.2-1.0 cm. that is poorly preserved, with specific characters unrecognizable; hence Peng

Remarks

& Robison (2000) suggested restricting the douvilleri species to its type specimen.