Rhyacophila mikusi, Kiss, Ottó, 2014

Kiss, Ottó, 2014, New species and subspecies of Rhyacophila (Trichoptera: Rhyacophilidae) from Asia, Zootaxa 3873 (4), pp. 416-424 : 417

Rhyacophila mikusi , new species

Figs 1–3

Male. Body length of single known specimen 5.5 mm, length of each forewing 7.4 mm, width of each forewing 2.9 mm, length of each antenna 4.8 mm. Body, antennae, palpi, wings, abdomen and legs dark brown.

Male genitalia ( Figs 1–3 ). Segment IX (IX., Figs 1, 2 ) subrectangular, longitudinally shorter (narrower) lateroventrally in lateral view and subquadrate with a small notch in middle of posterior margin in dorsal view. Apicodorsal portion of segment X ( Figs 1, 2 ) triangular with blunt and obtuse distal angle and sinuous dorsal margin in lateral view, basoventral portion in lateral profile finger-like; horseshoe-like with tiny blunt teeth on inner surface in dorsal view. Pair of anal sclerites (a.s., Fig. 1 ) bulging in lateral view. Apical band (a.b., Fig. 1 ) sack-like in lateral view. Also in lateral view, tergal strap (t.s., Fig. 1 ) sclerotized with short sclerotized apicolateral arms (s.t., Fig. 1 ). First segment of each inferior appendage (f.s., Fig. 1 ) trapezoidal, proximal margin taller than distal margin, longer than parameres; second joint of each inferior appendage (s.j., Fig. 1 ) with rounded dorsal apex and with lobe-like ventral part, elongate caudad in lateral view, distal edge densely covered with tiny spines. Phallotheca (phal., Figs 1, 3 ) longitudinally short, tall; dorsal appendage (d.ap., Fig. 1 ) short, stout process arising from endotheca (end., Figs 1, 3 ); phallicata (ph., Figs 1, 3 ) wide-based, long tube, curved upwards with blunt apex, narrowing at 1/3rd distance from base; phallicata ( Fig. 1 ) without ventral lobe; parameres (par., Figs 1, 3 ) longer than segments IX–X and twice as long as phallicata, each resembling elongate half willow leaf with slightly bent ventral margin and with six huge dorsal spines.

Female. Unknown.

Holotype: ♂, TAIWAN: 20 km E of Tungshih, Prov. Miaoli, ( Republic of China), 24o19’N, 121o03’E, 1335 m elevation, by light trapping, 18 October 1995, leg. Tibor Csővári and Pál Stéger (gen. prep. No. 119, Ottó Kiss, coll. Mátra Museum).

Differential diagnosis: This species belongs to the Rhyacophila yosiiana Group of the R. philopotamoides Branch ( Schmid 1970) . The male genitalia of the new species are similar to those of Rhyacophila ulmeri Navás 1907 (p. 399) from China (Thian-Shan), ( Ross 1956, pp. 93 and 119, fig. 213) and Rhyacophila kaoshiungensis Hsu & Chen 2003 (pp. 151–153, figs 1–3) from Taiwan, but differs from them in that:

1. Segment X is horseshoe-shaped in dorsal view (without a mesal protuberance like that of R. ulmeri and not as broadly bowl-shaped as in R. kaoshiungensis ).

2. The anal sclerites are present (absent in R. ulmeri and R. kaoshiungensis ).

3. The phallicata is a long tube, curved upward with blunt apex (not a short tube with an acute apex as in R. ulmeri and R. kaoshiungensis ).

4. Each paramere has 6 huge spines along most of the length of its dorsal margin (dorsal margin with smaller subapical spines in R. ulmeri and margin serrate in R. kaoshiungensis ).

5. The second joint of each inferior appendage has a rounded dorsal apex (not an acute dorsal apex as in R. ulmeri ).

Etymology. Named for László Mikus, who collected Trichoptera in Taiwan and donated them to me.

Figures

FIGURES 1 – 3. Rhyacophila mikusi, new species, holotype male genitalia. 1 L, left lateral view; 2 D, apicodorsal lobe of segment IX and segment X, dorsal view; 3 V, phallic apparatus, ventral view; a. l. IX. = apicodorsal lobe of segment IX; a. s. = anal sclerite; d. ap. = dorsal appendage; 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; s. t. = sclerotized lateral arm of tergal strap; t. b. = tergal band; t. s. = tergal strap; X. = segment X.