Nephrolenellus geniculatus

Order Redlichiida / Suborder Olenellina / Superfamily Olenelloidea / Family Olenellidae

nephr-, Greek, nephros, kidney; Olenellus, a trilobite genus name.

geniculatus, geniculate, knee-like bent.

Cephalon semicircular, border of moderate width, genal spines relatively short, intergenal angles distinct, posterior border furrow broad; glabella hourglass-shaped, constricted at L2, with three pairs of glabellar furrows; frontal lobe hemispherical to flattened-round convexity; occipital ring with occipital node; palpebral lobe crescentic, extending obliquely, distal end far from the glabella. Prothorax: 13 segments; axial rings with median node or small spine; 3rd segment macropleural, pleural spine long; remaining pleural spines smaller; pleural furrow broad, extending onto the pleural spine. Opisthothorax: at least 32 segments; some axial rings with median nodes; pleural lobes narrow, pleural furrows shallow. Rest of the opisthothorax and pygidium unknown.