Asaphida

Erixanium sentum

Order Asaphida / Superfamily Anomocaroidea / Family Aphelaspididae

Paibian (Furongian, Cambrian)Australia

Erixanium sentum — photo 1 — Photo 1 · Pygidium is the holotype CPC 578 (Australia; Öpik 1963) (Australia; Öpik 1963) (Australia; Öpik 1963)

Erixanium sentum — photo 2 — Photo 2 · Pygidium is the holotype CPC 578 (Australia; Öpik 1963) (Australia; Öpik 1963) (Australia; Öpik 1963)

Erixanium sentum — photo 3 — Photo 3 · Pygidium is the holotype CPC 578 (Australia; Öpik 1963) (Australia; Öpik 1963) (Australia; Öpik 1963)

Erixanium sentum — photo 4 — Photo 4 · Pygidium is the holotype CPC 578 (Australia; Öpik 1963) (Australia; Öpik 1963) (Australia; Öpik 1963)

Classification

Order Asaphida / Superfamily Anomocaroidea / Family Aphelaspididae

Genus

Erixanium Öpik, 1963

Genus author

Öpik A. A.

Genus etymology

Erixanium, Greek, a comb, describing the long thoracic spines

Species

E. sentum Öpik, 1963

Species author

Öpik A. A.

Species etymology

sentum, Latin, thorny, referring to the spiny pleural segments

Age

Paibian (Furongian, Cambrian)

Distribution

Australia

Diagnosis

Cephalon semicircular; glabella subrectangular to trapezoidal with a wide median ridge and 4 pairs of glabellar furrows; border narrow with a distinct border furrow; palpebral lobes long, eye ridges distinct; librigenae wide with long genal spines. Thorax of 12 segments; axis subequal in width to pleurae; pleural furrows narrow and deep, pleural spines long. Pygidium relatively small; axis rather short, of 5 rings; border narrow, convex anteriorly and flat posteriorly.

Remarks

This species is the type species of the genus Erixanium.