Oxyethira (Pacificotrichia) indorsennus 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 : 54-56

Taxon classification Animalia Trichoptera Hydroptilidae

Oxyethira (Pacificotrichia) indorsennus Kelley Figs 41-43, 100

Oxyethira indorsennus Kelley, 1989: 199, fig. 36.

Oxyethira tompa Oláh & Johanson, 2010a: 98, figs 56-58. Syn. n.

Revised diagnosis.

In ventral view males of Oxyethira indorsennus are distinguished from those of similar species, such as Oxyethira dorsennus , Oxyethira oropedion and Oxyethira quadrata by the rounded apical margins of the gonopods and apically rounded subgenital process, which contrast with the truncate apical margins of gonopods and triangular subgenital process of Oxyethira dorsennus ; the absence of a pair of small median setose lobes between gonopods and clearly rounded subgenital process distinguish them from Oxyethira oropedion ; and closely abutting gonopods, rather than widely separated, and rounded subgenital process rather than quadrate separates Oxyethira indorsennus from Oxyethira quadrata .

Male, antennae with 23-24 flagellomeres, flagellomeres rectangular in profile, without sensilla placodea. Anterior wing length, 1.3-2.1 mm (n=10). Tibial spurs 0,3,4. Abdominal sternite VII with sharp median spine, offset from distal margin.

Material examined.

Oxyethira indorsennus Kelley, Holotype. male, New Caledonia, mountain stream up Boulari River, (BPBM).

Other material.

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); 1 male (on slide), 6 females (1 on slide), Province Sud, stony stream draining Lac Yaté, 200 m, loc 5, 22°08.795'S, 166°42.313'E, Malaise trap 13-16.xi.2001, leg. K.A. Johanson, T. Pape & B. Viklund(NHRS); 11 males, 5 females, Province Nord, Mt Acupinié, fauna reserve, 482 m, stream, loc 19, 2109.369'S, 16519.209'E, Malaise trap, 24-28.xi.2001, leg. K.A. Johanson, T. Pape & B. Viklund(NHRS); 10 males, 12 females, Province Sud, stream draining to Marais de la Rivière Blanche, 1.35 km S Pont Pérignon, 22°08.496'S, 166°42.152'E, 180 m, 6-16.xi.2003, Malaise trap, loc#009, leg. K.A. Johanson (NHRS); numerous males, females, Province Sud, stream draining to Marais de la Rivière Blanche, 2.25 km SW Pont Pérignon, 22.14158°'S, 166.67993 °E, 157 m, 6-16.xi.2003, Malaise trap, loc#010, leg. K.A. Johanson (NHRS); 14 males, Province Sud, side stream to Rivière Blanche, 10.75 km SW Pont Pérignon, 22°10.073'S, 166°39.903'E, 180 m, 6-16.xi.2003, Malaise trap, loc#012, leg. K.A. Johanson (NHRS); 2 males, Province Sud, Monts Kwa Ne Mwa, on road between Noumea 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); numerous males, Province Sud, W slope Mt Ningua, Kwé Néco Stream, 3.9 km W summit of Mt Ningua, on Boulouparis–Thio Road, about 50 m upstream road, 21°44.359'S, 166°06.009'E, 117 m, 20. xi– 12.xii.2003, Malaise trap, loc#035, leg. K.A. Johanson (NHRS); 1 male, Province Sud, Platou de Dogny, source of Dogny River, about 900 m SE summit of Platou de Dogny, 21.61917°S, 165.88072°E, 919 m, 25. xi– 16.xii.2003, Malaise trap, loc#046, leg. K.A. Johanson (NHRS); 1 male, 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); 8 males (2 on slides), 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, 12.xii.2003-05.i.2004, Malaise trap, loc#054, leg. K.A. Johanson (NHRS); 54 males, 18 females, Province Nord, Mt Panié, stream at camp, 20.58167°S, 164.76472°E, 1311 m, 9.xii.2003, Malaise trap, loc#073, leg. K.A. Jo hanson (NHRS); numerous males, females, Province Nord, Mt Panié, stream at camp, 20. 58139°S, 164.76444°E, 1310 m, 9.xii.2003-2.i.2004, Malaise trap, loc#074, leg. K.A. Johanson (NHRS); 4 males, Province Nord, stream in Creek de Bambou, 5 m N road RT7 Ouégoa–Koumac, 20°27.863'S, 164°19.784'E, 58 m, 19.xii.2003, Malaise trap, loc#087, leg. K.A. Johanson (NHRS); 36, 15 females, 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 (NHRS); 2 males, 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).

Remarks.

Kelley (1989: 199, fig. 36) distinguished Oxyethira indorsennus from Oxyethira dorsennus on the basis of difference in spur formula (0,3,4 cf. 0,2,4) and “… shape of dorsum VIII". However, examination of the types shows Oxyethira indorsennus to differ also in shape of the apical margins of gonopods and subgenital process, these being rounded as illustrated for Oxyethira tompa which also shares features such as spur formula and number of antennal flagellomeres (=24). Thus we are synonymising Oxyethira tompa with Oxyethira indorsennus . The species was collected widely throughout the island (Fig. 100).

This species shows a general resemblance to Oxyethira smolpela Wells, from New Guinea, but that species has a distinctive titillator on the phallic apparatus which is lacking in Oxyethira indorsennus .