Rhyacophila tongmuensis, Sun, Chang-Hai, 2016

Sun, Chang-Hai, 2016, New species, new records, and new collection data of Rhyacophila from China (Trichoptera: Rhyacophilidae), Zootaxa 4189 (1), pp. 134-144 : 136-137

Rhyacophila tongmuensis n. sp.

( Fig. 2 A–2D)

Diagnosis. The new species can be diagnosed from other members of the R. mishmica Species Group by the small dorsal process and the bifurcate aedeagus in lateral view. In addition, the trapezoidal apical segments of the inferior appendages and the elongate complex of preanal appendages and segment X is also helpful to separate it from others.

Description. Length of each forewing: 7.0 mm (n = 1). Body (in alcohol) dark brown. Head dark brown, antennae brown, each flagellar segment with pale rings at basal and distal ends; palpi brown. Thorax dark brown dorsally, brown laterally and ventrally; wings brown; legs yellowish brown, with spurs dark brown. Abdomen dark dorsally and yellow ventrally.

Male genitalia. Segment IX (IX) in lateral view subrectangular, with upper margin longer than ventral margin, apicodorsal lobe tiny, triangular in dorsal view. Segment X fused with preanal appendages, forming complex (com.) in lateral view elongate-triangular with apex rounded and in dorsal view tapering from broad base to slightly incised apex. Basal segments of inferior appendages (b.i.a.) slightly shorter than complex of segment X and preanal appendages, each rectangular in lateral view and trapezoidal in ventral view; apical segment (a.i.a.) trapezoidal in lateral view, slender in ventral view, with apex rounded. Phallic apparatus short and simple: phallotheca (pht.)

subrectangular, dorsal process of phallic apparatus (d.p.) roof-shaped in lateral view and subrectangular with apex rounded in dorsal view; aedeagus (aed.) in lateral view with basal 1/3 broader than remainder, subapically bifurcate, in dorsal view tapering from broad base to rounded apex; parameres (par.) each tubular, with the distal half heavily setose.

Holotype male. P.R. CHINA: Jiang-xi Province , Wu-yi-shan National Nature Reserve , unnamed tributary of Tong-mu River, 17 km upstream of Wu-yi-shan Station, 27.834°N, 117.739°E, elev. 1105 m, 2 June 2005, collected by Lian-fang YANG.

Etymology. The species is named Rhyacophila tongmuensis with reference to the type locality, the river from which it was collected.

Distribution. China (Jiang-xi).

Remarks. Rhyacophila mishmica KIMMINS 1953 was included in R. curvata Group in Branch 3 by ROSS (1956). Based on the presence of a dorsal process of the phallic apparatus, SCHMID (1970) created the R. mishmica Species Group to accommodate 8 species from India . Then MALICKY (1995) and SUN & YANG (1995) each reported 1 species from Si-chuan , China . Additional collection data expand the distribution ranges of R. laptsapa SCHMID 1970 from Sikkim westwards to Nepal ( KISS 2013 ). Rhyacophila tongmuensis n. sp. is similar to the members of the R. curvata Species Group in the overall shape of the male genitalia, but the small dorsal process of the phallic apparatus indicates it is a member of the R. mishmica Species Group. Thus, there are now 3 Chinese species in the Species Group.

Figures

FIGURE 2. Rhyacophila tongmuensis n. sp., male genitalia. 2 A, left lateral, left inferior appendage omitted; 2 B, segment IX and complex of preanal appendages and segment X, dorsal; 2 C, segment IX and inferior appendages, ventral; 2 D, phallic apparatus, ventral, right paramere omitted. Abbreviations: ad. l. = apicodorsal lobe of segment IX; aed. = aedeagus; a. i. a = apical segment of an inferior appendage (paired); b. i. a. = basal segment of an inferior appendage; com. = complex of preanal appendages and segment X; d. p. = dorsal process of phallic apparatus; IX = segment IX; par. = parameres (paired); pht. = phallotheca.