Austronanus gelidus Just & Wilson, 2006, sp. nov.
Austronanus gelidus sp. nov. (Fig. 10) Etymology. The species name is Latin for icy, referring to the Antarctic habitat of this species. Material examined Holotype. Ψ, 1.31 mm, Antarctica, Davis Station, 68 ° 38 'S 77 ° 48 'E, M. Tucker, 6 January 1982, NMV J 4773. Description. Body width...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
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2006
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| Online Access: | https://zenodo.org/record/6254991 https://doi.org/10.5281/zenodo.6254991 |
| Summary: | Austronanus gelidus sp. nov. (Fig. 10) Etymology. The species name is Latin for icy, referring to the Antarctic habitat of this species. Material examined Holotype. Ψ, 1.31 mm, Antarctica, Davis Station, 68 ° 38 'S 77 ° 48 'E, M. Tucker, 6 January 1982, NMV J 4773. Description. Body width 0.46 length in female, widest at pereonite 2 or 3. Head length 0.73 width; length posterior to eyestalks 1.0 anterior length. Frontal margin lobe length 0.37 head length; apex bluntly angular in dorsal view, margin adjacent to apex convex, not sinuous. Eyestalks lateral apex somewhat flattened, long axis angling forward at approximately 45 °. Pereonite lateral margin 1–4 linear, 5–7 rounded. Pereonite 5 in dorsal view distinctly narrower than pereonites 4 and 6. Pereonite lateral margin 7 finely denticulate. Pleon length 1.0 width in female; pleotelson proximal margin length shorter than lateral margin length. Pleonite 1 width 1.0 distance between uropods, length 0.2 width. Pleotelson laterally angular anteriorly, lateral margins straight sided; proximal margin forming 60 ° angle with medial axis of pleon; lateral margins denticulate, with 12 denticles (right side only, left side damaged in holotype), increasing in size posteriorly; posterior margin forming 100 ° angle. Antennula articles 1 and 2 combined extending beyond eyestalk apex; article 1 length and width subequal to 2, tubular; 5 and 6 of subequal length, longer than articles 3 and 4. Antenna article 2 lateral margin with two spines (proximal spine smaller); article 3 in ventral view tubular, width 0.41 length, broadening slightly on crenate lateral margin, crenate flange low and thin, lacking subdivisions; article 5 distinctly longer than article 4; flagellum with 7 articles, proximal article 1.4 length of second articles. Pereopod I basis with crenate ridge on anterior margin, length 3.0 width; ischium anterodistal margin with crenate ridge; merus with 2 spines on anterior margin, 1 spine on posterior margin; carpus distal width 0.9 posterior margin length, with 2 ... |
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