Rhyacophila matanyii, Kiss, Ottó, 2013

Kiss, Ottó, 2013, Three new species of Rhyacophila (Trichoptera: Rhyacophilidae) from Taiwan and Nepal, Zootaxa 3640 (2), pp. 213-223: 216-217

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Rhyacophila matanyii

new species

Rhyacophila matanyii   , new species

Figs 1–6 View FIGURES 1 – 6

Male. Body length 7.2 mm, length of each forewing 8.9 mm, width of each forewing 3.1 mm, length of each antenna 6.5 mm. Body, antennae, palpi, wings, abdomen and legs yellowish brown in alcohol.

Male genitalia ( Figs 1–6 View FIGURES 1 – 6 ). Segment IX (IX, Figs 1–2 View FIGURES 1 – 6 ) narrowly rectangular in lateral view, roof-like in dorsal view. Segment X (X, Figs 1–2, 5 View FIGURES 1 – 6 ) rectangular with straight lateral margins, apicodorsal edge concave with two separate finger-like lobes, parallel with edge in dorsal view, without apicodorsal lobes. Anal sclerites (a.s., Figs 1, 5 View FIGURES 1 – 6 ) bulging, paired and touching each other in caudal view. Apical band (a. b., Figs 1, 5 View FIGURES 1 – 6 ) short, similar to willow leaf in lateral view and petal-like in caudal view. Tergal strap (t.s., Fig. 5 View FIGURES 1 – 6 ) heart-shaped and sclerotized, forming the base of the two arms of apical band in caudal view. Endotheca (end., Figs 1, 3–4 View FIGURES 1 – 6 ) short tube in lateral and ventral views: phallicata (ph., Figs 1, 3–4 View FIGURES 1 – 6 ) narrow tube directed dorsocaudad distally and without dorsal appendage (d. app.) of phallic apparatus in lateral view; ventral lobe (v.l., Figs 1, 3–4 View FIGURES 1 – 6 ) with dorsal and ventral spikes bent dorsocaudad in lateral and ventral views﹔ parameres (par., Figs 1, 3–4 View FIGURES 1 – 6 ) ribbon-like and three times as long as segments IX –X when fully everted, distal end similar to tennis racket with thick hair on margin in lateral view. First segment of each inferior appendage (f.s., Fig. 6 View FIGURES 1 – 6 ) trapezoidal, broad ventrally and narrow dorsally, ventrally as long as dorsal length of segment IX; upper lobe of second joint of each inferior appendage (s.j., Fig. 6 View FIGURES 1 – 6 ) long, distal part resembling a rattlesnake head directed slightly downward and with big triangular process on the base of lower margin, distal part of lower lobe hook-like in lateral view﹔ surfaces of upper and lower lobes densely setose.

Female. Unknown.

Holotype: 3, TAIWAN: 4 km N of Tupan, Taitung County, Southeast Taiwan, Republic of China, 22 o 28 ’N, 120 o 52 ’E, 390 m elevation, by light trapping, 13–14 August 1996, leg. Tibor Csövári and László Mikus (gen. prep. No. 113, Ottó Kiss, coll. Mátra Museum).

Differential diagnosis. This species belongs to the Rhyacophila scissa   Group of the R. philopotamoides Branch ( Schmid 1970)   . The male genitalia of this species are similar to those of Rhyacophila schismatica Sun & Yang 1995   from China, but differs from them in that:

1. Segment X is rectangular in dorsal view (not quadrate as in R. schismatica   ), the apicodorsal edge is concave (not convex), the lateral margins are straight (not concave), and the apicodorsal edge has two separate fingerlike lobes (absent in R. schismatica   ).

2. The distal part of the phallicata forms a straight tube slightly bent upward (not furcated as in R. schismatica   ).

3. The ventral lobe of the phallicata has one dorsal spike and one ventral spike (not with a single ventral spike as in R. schismatica   ).

4. The phallic parameres are ribbon-like when spread, each with its distal end similar to a tennis racket (not golfclub shaped and proximally not thin as in R. schismatica   ).

5. The distal part of the upper lobe of the second joint of each inferior appendage resembles a rattlesnake head (not an elongate spoon as in R. schismatica   ) and with big triangular process on the base of lower margin; the distal part of the lower lobe is hook-shaped (not trapezoidal as in R. schismatica   ).

Etymology. Named in honour of Professor Sándor Matányi, MD.