Oxyethira (Trichoglene) arok Olah & Johanson

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 : 46-47

Taxon classification Animalia Trichoptera Hydroptilidae

Oxyethira (Trichoglene) arok Olah & Johanson Figs 19-22, 92

Oxyethira arok Oláh & Johanson, 2010a: 91, figs 42-44.

Revised diagnosis.

In general appearance of male genitalia Oxyethira arok is closest to Oxyethira caledoniensis but appears to have gonopods reduced completely, which feature it shares with Oxyethira amieu sp. n. and Oxyethira spinifera ; however, Oxyethira arok has abdominal segment IX almost parallel-sided in distal half, rather than tapered as in Oxyethira amieu sp. n., and Oxyethira spinifera has the rods of subgenital processes tapered to acute apices compared with the blunt apices of Oxyethira arok .

Antennae: male with 20-21 flagellomeres; flagellomeres quadrate to slightly rectangular in profile; female with 17 flagellomeres, terminal 2 pale, rest dark. Anterior wing length: male 1.2-1.8 mm (n=10); female 1.4-1.6 mm (n =10). Tibial spurs 0,3,4. Abdominal sternite VII with small median spur offset from distal margin. Female with length of abdominal segment IX almost twice width, distal margin, with a sclerotised margin, mesally produced distally. Segment X stouter at base than apex, gradually tapered distally, truncate apically.

Material examined.

Paratype. 1 male, New Caledonia, Province Sud, Monts Kwa Ne Mwa, on road between Nouméa andYaté, 2.0 km E Pic Mouirange, 22°12.356'S, 166°40.798'E, 220 m, 16-30.xi.2003, Malaise trap, loc#014, leg. K.A. Johanson. Other material. 5 males, Province Nord, Mt Aoupinié, 354 m, stream, loc 17, light trap, 24.xi.2001, leg. K.A. Johanson, T. Pape & B. Viklund (NHRS); 2 males, Province Sud, Monts des Koghis, ca 300 m S Koghi Restaurant, 22.18288°S, 166.50167°E, 417 m, 2-16.xi.2003, Malaise trap, loc#004, leg. K.A. Johanson (NHRS); 11 males, 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); numerous males (5 on slides), females (5 on slides), Province Sud, Monts Kwa Ne Mwa, on road between Nouméa and Yaté, 2.0 km E Pic Mouirange, 22°12.356'S, 166°40.798'E, 220 m, 7-16.xi.2003, Malaise trap, loc#014, leg. K.A. Johanson (NHRS); 2 males, Province Nord, Aoupinié Mtn, Réserve spéciale de faune de l’Aoupinié, spring to side stream to Öröpömwati river, 21°09.032'S, 165°19.179'E, 441 m, 6-27.xii.2003, Malaise trap, loc#065, leg. K.A. Johanson (NHRS).

Remarks.

Specimens here identified as Oxyethira arok show some variability in proportions of abdominal segment IX and in male genital structures as apparent in Figures 17-19, but for the present these differences are considered insignificant.

Oxyethira arok has been collected from disjunct localities in the far south and central part of the island (Fig. 92).