Phacopida

Perirehaedulus caprus

Order Phacopida / Suborder Cheirurina / Superfamily Cheiruroidea / Family Encrinuridae / Subfamily Coronocephalinae

Ludfordian (Ludlow, Silurian)Canadian Arctic

Perirehaedulus caprus — photo 1 — Photo 1 · Holotype GSC 56052 (Canadian Arctic; Thomas et al., 1979) (Canadian Arctic; Thomas et al., 1979) (Canadian Arctic; Adrain et al., 1995)

Perirehaedulus caprus — photo 2 — Photo 2 · Holotype GSC 56052 (Canadian Arctic; Thomas et al., 1979) (Canadian Arctic; Thomas et al., 1979) (Canadian Arctic; Adrain et al., 1995)

Perirehaedulus caprus — photo 3 — Photo 3 · Holotype GSC 56052 (Canadian Arctic; Thomas et al., 1979) (Canadian Arctic; Thomas et al., 1979) (Canadian Arctic; Adrain et al., 1995)

Classification

Order Phacopida / Suborder Cheirurina / Superfamily Cheiruroidea / Family Encrinuridae / Subfamily Coronocephalinae

Genus

Perirehaedulus Adrain & Edgecombe, 1995

Genus author

Adrain J. M. & Edgecombe G. D.

Genus etymology

perire, Latin, to be lost; haedulus, a little goat

Species

P. caprus (Thomas in Thomas & Narbonne, 1979)

Species author

Thomas A. T. & Narbonne G. M.

Species etymology

capra, a nanny goat, referring to the goat-horn-shaped pair of spines in front of the glabella

Age

Ludfordian (Ludlow, Silurian)

Distribution

Canadian Arctic

Synonyms

Kailia? capra

Diagnosis

Glabella with 4 pairs of glabellar furrows, anterior lobe inflated, a pair of slender, outward- and backward-curved spines at the anterolateral part, a longitudinal furrow between the two spines; occipital ring longitudinally slightly longer medially; palpebral lobes on the outer part of the cheeks, convex; fixigenae with slender long genal spines curved outward-upward. Pygidium rounded-triangular; axis slightly convex, with 17 rings, rings 4 and 7 with median nodes, the posterior 6 rings interrupted by a smooth median longitudinal band; pleural region rather smooth with distinct pleural furrows and ribs.

Remarks

This species is the type species of the genus Perirehaedulus.