Oxyethira (Pacificotrichia) nehoue, 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 : 62-63

Taxon classification Animalia Trichoptera Hydroptilidae

Oxyethira (Pacificotrichia) nehoue sp. n. Figs 58-60, 83, 106

Diagnosis.

This species resembles Oxyethira melasma and was illustrated and described as that species by Kelley (1989); however the holotype is as in Figs 55-57, see discussion above. The two species are distinguished by male genital features: Oxyethira nehoue sp. n. has abdominal segment VIII in ventral view shallowly and narrowly excavated mid apically, not widely and deeply; fused gonopods tapered to an acute apex, not truncate; subgenital process elongate rectangular, truncate apically, not rounded, in lateral view sclerotised and arched ventrally; and phallic apparatus with a broad spine arising sub apically.

Description.

Male antennae with 25-27 flagellomeres; anterior wing length 1.3-1.7 mm (n=7); tibial spurs 0,3,4; abdominal sternite VII with sharp apical spine.

Genitalia (Figs 58-60). Abdominal segment VIII in ventral view rounded proximally, gradually tapered towards apex, with a shallow, narrow excavation mid apically. Abdominal segment IX similar in shape to VIII. Gonopods fused, triangular in ventral view, dorsal setose lobes slightly shorter than gonopods conjoined at base, subgenital process elongate, forming narrowly rectangular plate, apically truncate, but with slight bulge mid-apically. Phallic apparatus with a broad spine arising subapically, extending beyond apex.

Female unknown.

Material examined.

Holotype. Male (on slide), Province Nord, Rivière Néhoué, camp Amenage de Néhoué, 20°25.037'S, 164°13.222'E, 12 m, 19.xii.2003, light trap, loc#090, leg. K.A. Johanson (MNHP).

Paratypes. 5 males (on slides), data as for holotype (NHRS); 1 male, Province Sud, creek on road between Sarraméa & La Foa, 15.xii.1983, A. Wells (ANIC); 1 male (on slide), Province Sud, stream NE turnoff to Tribu Kouraga on Boulouparis-Thio road, 19.xii.1983, AW (ANIC); 1 male, Ouenghi River, nr Boulouparis, 20.xii.1983, A. Wells (ANIC); 1 male (on slide), Province Sud, NW Farino on Moindou road, 20.vii.1998, AW (ANIC); 20 males, Province Sud, Tamoa River, 700m S road RT1 between Noumea and La Foa, 22°04.518'S, 166°16.592'E, 19.xi.2003, light trap, loc#033, leg. K.A. Johanson (NHRS).

Etymology.

Named for the Rivière Néhoué where it was collected.

Remarks.

The distribution of this species is similar to that of Oxyethira ouenghi , mainly collected from a cluster of southern sites, but with one site in the far north (Fig. 106). A photograph of the type locality with the trap is rendered in Fig. 83.