Redlichiida

Olenellus gilberti

Order Redlichiida / Suborder Olenellina / Superfamily Olenelloidea / Family Olenellidae

Cambrian, Series 2, Stage 4USA, Canada

Olenellus gilberti — photo 1 — Photo 1 · Syntype (USA; Walcott 1910) Reconstruction (Palmer 1998) (USA; Webster 2015) (USA; Yuzhao) (USA; Zhonghouzhengzhi Xinliezhi) (USA; Webster 2015) (USA; Y.W)

Olenellus gilberti — photo 2 — Photo 2 · Syntype (USA; Walcott 1910) Reconstruction (Palmer 1998) (USA; Webster 2015) (USA; Yuzhao) (USA; Zhonghouzhengzhi Xinliezhi) (USA; Webster 2015) (USA; Y.W)

Olenellus gilberti — photo 3 — Photo 3 · Syntype (USA; Walcott 1910) Reconstruction (Palmer 1998) (USA; Webster 2015) (USA; Yuzhao) (USA; Zhonghouzhengzhi Xinliezhi) (USA; Webster 2015) (USA; Y.W)

Olenellus gilberti — photo 4 — Photo 4 · Syntype (USA; Walcott 1910) Reconstruction (Palmer 1998) (USA; Webster 2015) (USA; Yuzhao) (USA; Zhonghouzhengzhi Xinliezhi) (USA; Webster 2015) (USA; Y.W)

Olenellus gilberti — photo 5 — Photo 5 · Syntype (USA; Walcott 1910) Reconstruction (Palmer 1998) (USA; Webster 2015) (USA; Yuzhao) (USA; Zhonghouzhengzhi Xinliezhi) (USA; Webster 2015) (USA; Y.W)

Olenellus gilberti — photo 6 — Photo 6 · Syntype (USA; Walcott 1910) Reconstruction (Palmer 1998) (USA; Webster 2015) (USA; Yuzhao) (USA; Zhonghouzhengzhi Xinliezhi) (USA; Webster 2015) (USA; Y.W)

Olenellus gilberti — photo 7 — Photo 7 · Syntype (USA; Walcott 1910) Reconstruction (Palmer 1998) (USA; Webster 2015) (USA; Yuzhao) (USA; Zhonghouzhengzhi Xinliezhi) (USA; Webster 2015) (USA; Y.W)

Classification

Order Redlichiida / Suborder Olenellina / Superfamily Olenelloidea / Family Olenellidae

Genus

Olenellus Billings, 1861

Genus author

Billings E.

Genus etymology

Olenus, a trilobite genus name; -ellus, diminutive suffix.

Species

O. gilberti Meek in White, 1874

Species author

Meek F. B

Species etymology

Gilbert, surname

Age

Cambrian, Series 2, Stage 4

Distribution

USA, Canada

Synonyms

Olenellus (Elliptocephalus) gilberti; Elliptocephalus (Olenellus) gilberti; Olenellus (Olenellus) gilberti

Diagnosis

Cephalon semicircular, genal spines slender and long, border of moderate width; glabella hourglass-shaped, weakly constricted at S1, with three pairs of glabellar furrows; preglabellar field short; posterior margin of occipital ring with small node. Prothorax: 14 segments; Some axial rings with axial nodes; 3rd segment macropleural, pleural spine large and long; pleural furrow broad, extending onto the pleural spine; opisthothorax: 2-4 segments; 15th segment with slender, long axial spine. Pygidium very small, subsquare pentagonal to subcircular; axis unsegmented; posterior margin convex, without median notch.