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

Rhyacophila matanyii , new species

Figs 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 ). Segment IX (IX, Figs 1–2 ) narrowly rectangular in lateral view, roof-like in dorsal view. Segment X (X, Figs 1–2, 5 ) 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 ) bulging, paired and touching each other in caudal view. Apical band (a. b., Figs 1, 5 ) short, similar to willow leaf in lateral view and petal-like in caudal view. Tergal strap (t.s., Fig. 5 ) heart-shaped and sclerotized, forming the base of the two arms of apical band in caudal view. Endotheca (end., Figs 1, 3–4 ) short tube in lateral and ventral views: phallicata (ph., Figs 1, 3–4 ) 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 ) with dorsal and ventral spikes bent dorsocaudad in lateral and ventral views﹔ parameres (par., Figs 1, 3–4 ) 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 ) 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 ) 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, 22o28’N, 120o52’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.

Figures

FIGURES 1 – 6. Rhyacophila matanyii, new species, holotype male genitalia. 1 L, left lateral view without inferior appendages ﹔ 2 D, apicodorsal lobe of segment IX, and segment X, dorsal view ﹔ 3 L, phallic apparatus, left lateral view ﹔ 4 V, phallic apparatus, ventral view ﹔ 5 C, segment X, anal sclerites, apical band and tergal strap, caudal view ﹔ 6 L, right inferior appendage, left mesal view. a. b. = apical band ﹔ a. s. = anal sclerite ﹔ end. = endotheca ﹔ f. s. = first segment of paired inferior appendages ﹔ IX. = segment IX ﹔ par. = paired parameres ﹔ ph. = phallicata ﹔ phal. = phallotheca ﹔ r. a. s. = radix of anal sclerite ﹔ s. j. = second joint of paired inferior appendages ﹔ t. s. = tergal strap ﹔ v. l. = ventral lobe of phallicata ﹔ X. = segment X.