Rhyacophila lakatosi, Kiss, Ottó, 2011

Kiss, Ottó, 2011, Two new species of Rhyacophila (Trichoptera, Rhyacophilidae) from Nepal, Zootaxa 2991, pp. 62-68 : 63-65

Rhyacophila lakatosi new species

Figs 1 − 4 , 7

Male. Body length 9 mm, forewing length 11.0 mm, forewing width 4 mm, length of each antenna 6 mm. Body, antennae, palpi, wings, abdomen brown, legs yellowish brown.

Male genitalia ( Figs 1–4 ). Segment IX (a.l.IX, Fig. 1 ) trapezoidal, divided on midline for half its length (a.l.IX, Fig. 4 ), each branch ending ventrally in long, slender, sickle-like spines﹔ with slight, obtuse protrusion at mid length of dorsal margin of trapezoid in lateral view and large spike in middle of each apical margin of trapezoid. Segment X (X, Fig. 1 ) triangular, with concave dorsal and distal margins in lateral view, with apicodorsal angle blunt and apicoventral angle wedge-shaped. Apical band (a.b., Fig. 1 ) relatively narrow in lateral view. Anal sclerites (a.s., Fig. 1 ) directed ventrocaudad distally. Endotheca (end., Figs 1–3 ) funnel-like, phallicata (ph., Figs 1–3 ) narrow tube, attentuated and asymmetrically sinuous distally﹔ dorsal appendage (d. app., Figs 1–3 ) of phallic apparatus slender, narrow lobe curved slightly upwards, with tapering apex. First segment of each inferior appendage (f.s., Fig. 1 ) broad and as long as trapezoidal segment IX, second joint of each inferior appendage (s.j., Fig. 1 ) long and narrow with blunt apex.

Female body length 11 mm, forewing length 13 mm, forewing width 5.5 mm, length of each antenna 8 mm. Body, antennae, palpi, wings, abdomen and legs yellowish brown. Genitalia as in Fig. 7 .

Holotype: 1 ♂, NEPAL: Mt. Kalinchok, Tinsang Pass, 3300 m elevation, by light trapping, 4 July 1997, leg. Márton Hreblay and Krisztina Csák (gen. prep. No.111/A, Ottó Kiss) (coll. Mátra Museum).

Paratypes: 1 ♀, NEPAL: Mt. Kalinchok, 3 km SW of Mt. Kalinchok peak, 27o23’N, 86o01’E, 2900 m elevation, by light trapping 30 June 1997, leg. Márton Hreblay and Krisztina Csák (gen. prep. No.111/B Ottó Kiss, Fig. 7 ) (coll. Mátra Museum).

1 ♂ Mt. Kalinchok, 3 km SW of Mt. Kalinchok peak, 27o23’N, 86o01’E, 2900 m elevation, by light trapping 30 June 1997, leg. Márton Hreblay and Krisztina Csák (coll. Ottó Kiss).

42 ♂♂, Mt. Kalinchok, 5 km W of Bigu, 27o63’N, 86o09’E, 2300 m elevation, by light trapping 3 July 1997, leg. Márton Hreblay and Krisztina Csák (coll. Ottó Kiss).

2 ♂♂ Mt. Kalinchok, 2 km N of Terebhir, 27o65’N 86o04’E, 2600 m elevation, by light trapping 2 July 1997, leg. Márton Hreblay and Krisztina Csák (coll. Ottó Kiss).

1 ♂ East Nepal, Deorali Danda, 6 km NW of Yamphudin, 2900 m elevation, by light trapping, 13 May 1997, leg. Márton Hreblay and Lajos Szécsényi (coll. Ottó Kiss).

Differential diagnosis. This species is similar to Rhyacophila kyadongpa Schmid, (1970 , pp 221–222, pl. XLVI, figs 1–3﹔ herein Figs 5, 6 ), of his R. naviculata Group, but differs from it in that:

1. Segment IX is trapezoidal in lateral view (and not slender as in R. kyadongpa )﹔ divided on the midline for half its length in dorsal view (not just 1/5th its length)﹔ each branch ending ventrally in a long, narrow, sickle-like spine (with these spines arising basolaterally in R. kyadongpa )﹔ with a dorsal, obtuse protrusion at mid length in the dorsal margin of the trapezoid (protrusion absent in R. kyadongpa )﹔ and with a large spike in the middle of the truncate apical margin of the trapezoid (the apex is simply acute, not truncate, and without a spike in R. kyadongpa ).

2. Segment X is triangular in lateral view, with concave dorsal and distal margins, where the apicodorsal angle is blunt and the apicoventral angle is wedge-shaped (not narrow and elongate).

3. The phallicata is much more sinuous distally (not nearly straight). 4. The dorsal appendage of the phallic apparatus has an upwardly curved and pointed apex in lateral view (not wedge-like apically).

Derivatio nominis. This species is dedicated to Prof. Gyula Lakatos, who helped me with my scientific work.

Figures

FIGURE 7. Rhyacophila lakatosi new species, allotype female genitalia, left lateral view.

FIGURES 1 − 4. Rhyacophila lakatosi, new species, holotype male genitalia. 1, left lateral view ﹔ 2, phallic apparatus, left lateral view ﹔ 3, phallic apparatus, ventral view ﹔ 4, apicodorsal lobe of segment IX, dorsal view.

FIGURES 5 − 6. Rhyacophila kyadongpa Schmid, 1970, male genitalia. 5, left lateral view ﹔ 6, apicodorsal lobe of segment IX, dorsal view (from Schmid, 1970).