Oxyethira (Pacificotrichia) rougensis, 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 : 56-58

Taxon classification Animalia Trichoptera Hydroptilidae

Oxyethira (Pacificotrichia) rougensis sp. n. Figs 44-46, 81, 101

Diagnosis.

Oxyethira rougensis sp. n. groups with Oxyethira oropedion , Oxyethira quadrata , Oxyethira dorsennus , and Oxyethira indorsennus , but unlike any of those species, males have venter of abdominal segment VIII deeply and narrowly excised apico-medially and subgenital process sculpted latero-distally.

Description.

Male antennae: with 23-24 flagellomeres, flagellomeres rectangular in profile; anterior wing length 1.1-1.8 mm (n=3); tibial spurs 0,3,4; abdominal sternite VII with short sharp median spine on distal margin.

Male, genitalia. Abdominal segment VIII conical, distally about half width of proximal quarter. Segment IX in ventral view almond shaped, in lateral view triangular proximally, mid-dorsally less than half length of venter. Gonopods fused basally, discrete and rounded distally, with slender mid-ventral apodeme reaching to proximal margin of segment IX; subgenital processes fused, forming a stout plate, rounded distally in ventral view, angular in lateral view, with subapical sculpturing towards apex on each side, and small notch mid apically; setose lobes about 2/3 length of plate. Phallic apparatus slender, straight, with short apical spine.

Material examined.

Holotype. Male (on slide), New Caledonia, Province Nord, Plaine des Gaïacs, Rivière Rouge, 14.2 km NW summit of Mt Rouge, 50 m upstream road RT1 Noumea–Koné, 21°31.573'S, 164°46.690'E, 23 m, 2.i.2004, light trap, loc#104, leg. K.A. Johanson (NHRS).

Paratypes. 2 males (on slides), collection data as for holotype.

Remarks.

Oxyethira rougensis was taken only at the type locality, in the north-west of the island (Fig. 101). A photograph of the type locality with the trap immediately below the small waterfall is rendered in Fig. 81.