Austrosignum Hodgson 1910

Key to species of Austrosignum

1. Pereionite 1–7 dorsal surface smooth, without ornamentation; eyestalks shaft before apex approximately parallel......... 2

- Pereionite 1–4 dorsal surface with transverse bumps (wrinkled appearance in dorsal view), with pair of low broad lobes or convexities; pereionite 5–7 dorsal surface with transverse ridges; eyestalks shaft before apex constricted proximally......................................................................... Austrosignum escandellae Castelló, 2004

2. Pleotelson posterior projection evenly curving into lateral margin; antennula article 1 shorter than article 2; antenna article 5 only slightly longer than article 4; pereiopod I merus posterior margin with only fine setae................................................................................................ Austrosignum glaciale Hodgson, 1910

- Pleotelson posterior projection set apart from lateral margins by concavity at level of uropods; antennula article 1 length subequal to, or longer than article 2; antenna article 5 distinctly longer than article 4; pereiopod I merus posterior margin with one robust seta on distal margin............................................................................. 3

3. Body dorsally with scattered fine simple setae; body widest in male at pereionite 2; pleotelson lateral margin with proximal neck before convex margins..................................................... Austrosignum latum sp. nov.

- Body dorsal surface with scattered long simple setae; body widest in male at pereionite 3; pleotelson lateral margin convex, without proximal neck........................................................ Austrosignum pilosum sp. nov.