Ptychopariida

Aciculolenus askewi

Order Ptychopariida / Suborder Olenina / Family Olenidae

Jiangshanian (Furongian, Cambrian)Canada

Aciculolenus askewi — photo 1 — Photo 1 · genal angle Holotype RBCM-P977 (right is a latex cast of the external mould; Canada; Chatterton 2020) Restoration (Chatterton 2020) Paratypes RBCM-P976, RBCM-P980, RBCM-P979 (Canada; Chatterton 2020)

Aciculolenus askewi — photo 2 — Photo 2 · genal angle Holotype RBCM-P977 (right is a latex cast of the external mould; Canada; Chatterton 2020) Restoration (Chatterton 2020) Paratypes RBCM-P976, RBCM-P980, RBCM-P979 (Canada; Chatterton 2020)

Aciculolenus askewi — photo 3 — Photo 3 · genal angle Holotype RBCM-P977 (right is a latex cast of the external mould; Canada; Chatterton 2020) Restoration (Chatterton 2020) Paratypes RBCM-P976, RBCM-P980, RBCM-P979 (Canada; Chatterton 2020)

Aciculolenus askewi — photo 4 — Photo 4 · genal angle Holotype RBCM-P977 (right is a latex cast of the external mould; Canada; Chatterton 2020) Restoration (Chatterton 2020) Paratypes RBCM-P976, RBCM-P980, RBCM-P979 (Canada; Chatterton 2020)

Aciculolenus askewi — photo 5 — Photo 5 · genal angle Holotype RBCM-P977 (right is a latex cast of the external mould; Canada; Chatterton 2020) Restoration (Chatterton 2020) Paratypes RBCM-P976, RBCM-P980, RBCM-P979 (Canada; Chatterton 2020)

Classification

Order Ptychopariida / Suborder Olenina / Family Olenidae

Genus

Aciculolenus Palmer, 1965

Genus author

Palmer A. R.

Genus etymology

acicul, acicula, needle; Olenus, a trilobite genus name; possibly referring to the needle-like spine at the fixigenal

Species

A. askewi Chatterton, 2020

Species author

Chatterton B. D. E.

Species etymology

Don Askew, a Canadian trilobite collector and preparator

Age

Jiangshanian (Furongian, Cambrian)

Distribution

Canada

Diagnosis

Dorsal shield narrow and long. Glabella barrel-shaped with three pairs of glabellar furrows; occipital ring elongated on the sagittal line with one occipital node and one occipital spine; occipital furrow W-shaped; eyes small; eye ridges prominent; fixigenae with sharp slender genal spines; librigenae narrow with long genal spines. Thorax of 13 segments; each axial ring with a backward-extending axial spine; pleurae narrower than the axis, pleural spines slender, longest on segment 10. Pygidium small, semi-ovate, axis wide.

Remarks

Body length about 1.5 cm.