Oxyethira (Trichoglene) tiwaka, Wells, Alice & Johanson, Kjell Arne, 2015

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 : 40-41

Taxon classification Animalia Trichoptera Hydroptilidae

Oxyethira (Trichoglene) tiwaka sp. n. Figs 4-6, 75, 87

Diagnosis.

Readily recognised by the short, blunt, darkly sclerotised peg-like gonopods but in other respects showing very close resemblance to Oxyethira (Trichoglene) spinifera which has gonopods reduced so severely that they can be recognised as only small convexities on the apico-ventral margin of segment IX. Also similar to Oxyethira (Trichoglene) perignonica sp. n. in having abdominal segment IX subquadrate, but that species has the gonopods situated laterally, and curved mesally, and the subgenital processes in the form of convergent, rather than parallel, spines.

Description.

Male antennae with 18-19 flagellomeres, flagellomeres all dark, without sensilla placodea, each flagellomere about as long as wide; anterior wing length 1.4-1.7 mm (n=8); tibial spurs 0,3,4; abdominal sternite VII with small sharp median spur.

Male, genitalia (Figs 4-6). Abdominal segment IX quadrate in ventral view, slightly concave apico-ventrally, dorsally with proximal margin excised, V-shaped. Gonopods in form of two widely spaced, blunt black pegs. Setose lobes of ventral process angled laterally, ventral processes elongate, widely separated, tapered to narrowly rounded apices. Phallic apparatus elongate, with slender titillator and apically narrow, sinuous spine.

Material examined.

Holotype. Male, (on slide), New Caledonia, Province Nord, Bouérabate Stream, S Mont Ninndo, along road Barabache–Boulagoma, 20°17.409'S, 164°11.242'E, 60 m, 19.xii.2003-7.i.2004, Malaise trap, loc#089, leg. K.A. Johanson (MNHP).

Paratypes. 1 male (on slide), data as for holotype, (NHRS); 1 male, Province Sud., Rivière Bleue, 282 m, stony river, loc 4, 22°05.705'S, 166°38.225'E, Malaise trap, 13-16.xi.2001, leg. K.A. Johanson, T. Pape, B. Viklund (NHRS); 18 males, 11 females (3 on slides), Province Sud, Col d’Amieu, fauna reserve, 415 m, small forest stream, loc 25, 21°33.830'S, 165°45.584'E, Malaise trap, 30. xi– 5.xii.2001, leg. K.A. Johanson, T. Pape, B. Viklund (NHRS); 1 male, Province Sud, Monts Kwa Ne Mwa, on road between Noumea and Yaté, Rivière des Pirogues, 22°11.225'S, 166°43.338'E, 100 m, 7.xi.2003, light trap, loc#016, leg. K.A. Johanson (NHRS); 1 male, Province Sud, Mt Dzumac, source stream of Ouinne River, downstream crosspoint to mountain track, 22°01.997'S, 166°28.486'E, 795 m, over about 30 m waterfall, 18. xi– 4.xii.2003, Malaise trap, loc#031, leg. K.A. Johanson (NHRS); 2 male, 4 females, Province Sud, W slope Mt Ningua, Kwé Néco Stream, at Camp Jacob, 3.9 km W summit of Mt Ningua, on Boulouparis-Thio Road, about 50 m upstream road, 21°44.083'S, 166°06.298'E, 117 m, 29.xi.2003-12.xii.2003, Malaise trap, loc#053, leg. K.A. Johanson (NHRS); 10 males, Province Sud, W slope Mt Ningua, Kwé Néco, Stream, at Camp Jacob, 3.7 km WNW summit of Mt Ningua, on Boulouparis–Thio Road, about 50 m upstream road, 21°43.613'S, 166°06.567'E, 150 m, 29. xi– 12.xii.2003, Malaise trap, loc#054, leg. K.A. Johanson (NHRS); 1 male (on slide), Province Nord, Wemwâdiu stream, 850 m E summit Kögi Mtn, 5 m upstream road, about 200 m S Tiwaka River, 20°49.020'S, 165°14.165'E, 24 m, 6-27.xii.2003, Malaise trap, loc#067, leg. K.A. Johanson (NHRS); 1 male (no genitalia) labelled "sp. D", Province Sud, Co Rigule Stream, 2.1 km N bridge over Baie de Yaté, 4.3 km S Wé Ngéré, 22°08.147'S, 166° 56.072'E, 14 m, 18.i.2004, light trap, loc#122, leg. K.A. Johanson (NHRS).

Etymology.

Named for the river beside which one of the specimens was collected.

Remarks.

Oxyethira tiwaka was collected quite commonly in the southern region, but at only two disjunct localities in the north (Fig. 87). A photograph of the type locality with the trap is rendered in Fig. 75.