Stephenseniellus serraticornis Just & Wilson, 2006, sp. nov.

• Main Authors: Just, Jean, Wilson, George D. F.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2006
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Paramunnidae; Stephenseniellus; Stephenseniellus serraticornis; Auckland Island
• Online Access: https://doi.org/10.5281/zenodo.6255007; http://treatment.plazi.org/id/463E79384768FF942E4DFA33FDC0F92B

Stephenseniellus serraticornis sp. nov. (Fig. 19) Paramunna ( serrata (Richardson)?).– Stephensen, 1927: 359, fig. 25. Etymology. The species name is derived from the Latin serratus (with teeth) and cornu (horn, traditionally used for the antennae) alluding to the row of strong denticles on the lateral margin of article 3 of the antennae. Remarks on type material. The holotype lacks all pereopods. Stephensen (1927, fig. 25P1) illustrated pereopod I; we have redrawn his illustration in our Fig. 19 p1. Material examined Holotype . ɗ, 1.9 mm, Carnley Harbour, Auckland Island, New Zealand, on the shore under stones at low tide, 29 November 1914, ZMUC­CRU­4920. Description. Body widest in male at pereonite 2 or 3. Head length 0.70 width; length posterior to eyestalks 1.3 anterior length. Frontal margin lobe length 0.30 head length; apex broadly rounded in dorsal view. Eyestalks lateral apex broadly rounded, shaft curving posteriorly, long axis angling forward 35° in male. Pereonite lateral margin 1–4 linear, 5–7 angular, not projecting over coxae, with posterior concavity. Pereonite 5 in dorsal view distinctly narrower than pereonites 4 and 6. Pereonite 5–7 lateral margins with robust setae. Pleon length 0.84 width in male. Pleonite 1 width 1.1 distance between uropods, length 0.3 width. Pleotelson proximal margin length subequal to lateral margin length; laterally produced, inflection near middle of lateral margin; proximal margin in dorsal view forming 45° angle with medial axis of pleon; lateral margins denticulate, denticles largest at rounded corners, low denticles more posteriorly, with 4 denticles per side, several additional fine denticles more posteriorly; posterior margin in male forming 135° angle, set apart from lateral margins by slight concavity at level of uropods. Antennula with 5 articles; articles 1and 2 combined shorter than eyestalk; article 1 longer and broader than 2, inflated; article 2 with distoventral projection, distal articles inserting dorsally; distal article 5 shorter than articles 3 ...