Austronanus mawsoni Just & Wilson, 2006, sp. nov.

• Main Authors: Just, Jean, Wilson, George D. F.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2006
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Paramunnidae; Austronanus; Austronanus mawsoni; Antarctic; Davis Station; Davis-Station; Antarc*; Antarctica
• Online Access: https://zenodo.org/record/6254993; https://doi.org/10.5281/zenodo.6254993

Austronanus mawsoni sp. nov. (Figs 11–12) Etymology. The species is named after Sir Douglas Mawson, Australias pre­eminent Antarctic explorer. Material examined Holotype. Adult Ψ, 1.35 mm, Antarctica, Davis Station, 68 ° 34.5 'S, 77 ° 53 'E, Site C, 25 January 1982, M. Tucker, NMV J 4774. Paratypes. Same data as holotype, NMV J 53233 (ΨB). Description. Body width 0.48 length in female, widest at pereonite 3. Head length 0.48 width; length posterior to eyestalks 0.65 anterior length. Frontal margin lobe length 0.40 head length; apex bluntly angular in dorsal view, margin adjacent to apex concave, sinuous. Eyestalks lateral apex somewhat flattened, long axis angling forward at approximately 40 °. Pereonite lateral margin 1–4 linear, 5–7 rounded. Pereonite 5 in dorsal view distinctly narrower than pereonites 4 and 6. Pereonite lateral margins 6–7 finely denticulate. Pleon length 1.0 width. Pleonite 1 width 1.1 distance between uropods. Pleonite 1 length 0.2 width. Pleotelson proximal margin length shorter than lateral margin length forming 60 ° angle with medial axis of pleon; lateral margins denticulate, with 11 denticles per side, length of denticles subequal except for small anterior and single large posterior ones; posterior margin in female forming 100 ° angle, with single denticle each side. Antennula articles 1–2 combined extending beyond eyestalk apex; article 1 length subequal to 2, broader than 2, inflated; article 2 with distoventral projection, distal articles inserting dorsally; 5–6 of subequal length, longer than articles 3–4. Antenna article 2 lateral margin with two spines (proximal spine smaller); article 3 in ventral view inflated midlength, margins curved, width 0.50 length, with crenate flange on lateral margin, broad (width near length of small setae), with distinct scalloping; article 5 distinctly longer than article 4; flagellum with 6 articles, proximal article 2.7 length of second article. Pereopod I basis with low crenate ridge on anterior margin, length 3.3 width; merus with 2 spines on ...