Caledonotrichia nyurga Olah & Johanson

Wells, Alice, Johanson, Kjell Arne & Mary-Sasal, Nathalie, 2013, The New Caledonian genus Caledonotrichia Sykora (Trichoptera, Insecta) reviewed, with descriptions of 6 new species, ZooKeys 287, pp. 59-89 : 80-84

Caledonotrichia nyurga Olah & Johanson Figs 1861-6369

Caledonotrichia nyurga Oláh & Johanson (2010: 101).

Revised diagnosis.

Males of this species are recognised in mixed collections by the clearly visible genitalia (Figs 61-63, 69), a consequence of the deep excision of the posterior margin of sternite IX, and also by the moniliform distal segments of the antennae. Caledonotrichia nyurga is smaller-bodied than both Caledonotrichia extensa and the otherwise similar Caledonotrichia sykorai sp. n. with which it shares the feature of a pronounced mesal process on the posterior margin of sternite VII, though in the latter species the mesal process is far shorter than in Caledonotrichia nyurga and elongate triangular. Caledonotrichia nyurga also differs from Caledonotrichia sykorai by the very slender anterior extension of abdominal segment IX, broader ventral lobes of gonopods, and the less sharply excised abdominal tergite IX.

Additional information, male. Head, rounded as in Caledonotrichia capensis . Antennae (Fig. 18) with 25-39 flagellomeres; flagellomere shape variable; distal flagellomeres moniliform, proximal flagellomeres elongate cylindrical. Maxillary palps with basal 2 segments short and rounded, rest cylindrical: segment 3 slightly shorter than segment 4, segment 5 slender, elongate with length about 10 × as long as width and equal to length of segments 3 and 4 together. Forewing length, 1.4-2.0 mm (n=10), apically less sharply tapered than other congeners.

Material examined.

New Caledonia: Holotype male, 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, K. A. Johanson (MNHN); 3 males (on slides), Province Sud, Rivière Bleue, 282 m, stony river, loc 4, 22°05.705'S, 166°38.225'E, Malaise trap, 13-16.xi.2001, Johanson, Pape & Viklund (NHRS); 2 males (1 male on slide), Province Sud, Sarraméa, 2907 m, stony forest stream, loc 13 21°37.097'S 165°49.351'E, Malaise trap, 18-21.xi.2001, Johanson, Pape & Viklund (NHRS); 4 males, Province Nord, Mt. Panié, 350 m, loc. 16 rocky river downstream waterfall, 20°35.864'S, 164°49.780'E, Malaise trap, 22-26.xi.2001, Johanson, Pape & Viklund (NHRS); 4 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, K. A. Johanson (NHRS); 1 male, Province Sud, Mt. Dzumac, source stream of Ouinne River, near crosspoint to mountain track, 22°02.439'S, 166°28.646'E, 805 m, 18. xi– 4.xii.2003, Malaise trap, loc#029, K. A. Johanson (NHRS); 10 males, 11 females, Province Sud, Mt. Dzumac, source stream of Ouinne River, near crosspoint to mountain track, 22°02.073'S, 166°28.460'E, 810 m, 18. xi– 4.xii.2003, Malaise trap, loc#030, K. A. Johanson (NHRS); 4 males, 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, K. A. Johanson (NHRS); 15 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, K. A. Johanson (NHRS); 1 male, Province Sud, Creek Froid, 10 m upstream bridge on La Foa–Koindé road, 200 m W crossroad to Ouipouin, 21°38.581'S, 165°56.672'E, 180 m, 4.i.2004, light trap, loc#105, K. A. Johanson (NHRS).

Holotype male (examined):

New Caledonia, Provence Sud, W. slope of Mt Ningua, Kwe Néco Stream, at Camp Jacob, 3.7 km WNW summit of Mt. Ningua, on Boulouparis-Thio Road, 21°43.613'S, 166°06.567'E, 29. xi– 12.xii.2003, K. A. Johanson (alcohol, MNHP).