Odontopleurida

Odontopleura (Odontopleura) arctica

Order Odontopleurida / Family Odontopleuridae

Gorstian (Ludlow, Silurian)Canadian Arctic Archipelago

Odontopleura (Odontopleura) arctica — photo 1 — Photo 1 · (Odontopleura)) Emmrich, 1839 Holotype GSC95875 (Canada; Adrain et al., 1990) Paratype GSC95876 (Canada; Adrain et al., 1990) Other paratypes (Canada; Adrain et al., 1990)

Odontopleura (Odontopleura) arctica — photo 2 — Photo 2 · (Odontopleura)) Emmrich, 1839 Holotype GSC95875 (Canada; Adrain et al., 1990) Paratype GSC95876 (Canada; Adrain et al., 1990) Other paratypes (Canada; Adrain et al., 1990)

Odontopleura (Odontopleura) arctica — photo 3 — Photo 3 · (Odontopleura)) Emmrich, 1839 Holotype GSC95875 (Canada; Adrain et al., 1990) Paratype GSC95876 (Canada; Adrain et al., 1990) Other paratypes (Canada; Adrain et al., 1990)

Classification

Order Odontopleurida / Family Odontopleuridae

Genus

Odontopleura, subgenus Odontopleura (Odontopleura

Genus author

Emmrich H. F.

Genus etymology

odonto-, Greek, tooth; pleur-, Greek, side, rib

Species

O. (O.) arctica Adrain & Chatterton, 1990

Species author

Adrain J. M. & Chatterton B. D. E.

Species etymology

arctica, arctic

Age

Gorstian (Ludlow, Silurian)

Distribution

Canadian Arctic Archipelago

Diagnosis

Cephalon semi-elliptical, surface densely covered with nodes; glabellar lateral lobes 2 pairs dorsally, 3 pairs visible ventrally; occipital lobes weakly differentiated; eyes opposite the glabellar L1; a pair of long occipital spines, extending backward to the 6th thoracic segment; posterior border with short upward-oblique spines; librigenal border with about 16 pairs of marginal spines lengthening from front to back, genal spines medium-length. Thorax of 9 segments; axis narrower than pleurae, each segment with two longer axial spines and several short axial spinules; each pleura also with several short upward-oblique spinules, pleural spines lengthening from front to back. Pygidium wide; axis of two rings, each with a pair of axial spines; a pair of large pleural spines dividing the marginal spines into three outer pairs and two inner pairs.