Oxyethira (Pacificotrichia) dorsennus Kelley

Wells, Alice & Johanson, Kjell Arne, 2015, Review of New Caledonian species of Oxyethira Eaton, with description of 17 new species, and new records for Hydroptila Dalman and Hellyethira Neboiss (Trichoptera, Hydroptilidae), ZooKeys 530, pp. 37-90 : 54

Taxon classification Animalia Trichoptera Hydroptilidae

Oxyethira (Pacificotrichia) dorsennus Kelley Figs 39, 40, 80, 99

Oxyethira dorsennus Kelley, 1989: 199, figs 35, 44, 58.

Revised diagnosis.

Males are distinguished from the closely similar Oxyethira indorsennus by having spur formula 0,2,4, apical margins of gonopods truncate and subgenital process triangular rather than rounded as in Oxyethira indorsennus . These features also distinguish Oxyethira dorsennus from Oxyethira oropedion , which has apically well-separated gonopods with a pair of small setose lobes midventrally. Kelley (1989) distinguished Oxyethira dorsennus from Oxyethira indorsennus on the basis of spur count and the shape of dorsum [abdominal segment] VIII; this latter feature, however, appears to be less reliable than the shape of genital structures.

Male, antennae with 24 flagellomeres, flagellomeres rectangular in profile, without sensilla placodea. Anterior wing length, 1.5-2.1 mm (n=2). Tibial spurs 0,2,4. Abdominal sternite VII with short strong spur medially, offset from distal margin.

Material examined.

Holotype. Male, New Caledonia, mountain stream up Boulari River, (BPBM). Other material. 1 male (on slide), Province Sud, Couvelée River at Haute Couvelée, 2.8 km SV summit of Mt Piditéré, 3.5 km NNE Dumbéa, 22°07.405'S, 166°28.023'E, 27 m, 28.xi.2003, light trap, loc#052, leg. K.A. Johanson (NHRS); 1 male (on slide), Province Sud, Xwé Pemöu Stream, 300 m N bridge over Dathio River at Atè, 6.2 km WNW Thio, 21.58835°S, 166.15117°E, 13 m, 29.xi.2003, light trap, loc#056, leg. K.A. Johanson (NHRS); 1 male, Province Sud, lower part Rivière des Pirogues, 800 m WNW summit of Mont Imbaah, 4.7 km E Lucky Creek in Plum, 22°18.559'S 166°41.227'E, 1.3 m, 1.xii.2003, light trap, loc#059, leg. K.A. Johanson (NHRS).

Remarks.

Only three further specimens of this species have been identified, all from the south of the island (Fig. 99). They conform in detail with the type. A photograph of the type locality with the trap is rendered in Fig. 80.