Chimarra abacensis, Johanson, Kjell Arne & Oláh, János, 2012

Johanson, Kjell Arne & Oláh, János, 2012, Revision of the Fijian Chimarra (Trichoptera, Philopotamidae) with description of 24 new species, Zootaxa 3354, pp. 1-58 : 34-36

Chimarra abacensis , new species

Figs. 19 , 100–104

In lateral view, the segment IX and the gonopods of C. abacensis resembles that of C. cakaudrivensis , from which it is distinguished by the less ventrally expanded basal part of each gonopod and much longer tergum X.

Male. Body brownish grey, dorsal part of meso- and metathorax pale brown. Dark area between lateral and anterior ocelli. Foreleg anterior claw as long as foreleg spur.

Wings ( Fig. 19 ). Forewings 5.3 mm (n=1), brown; ratio of length to breadth 3.4; R1 nearly straight before crossvein r; radial sector slightly produced anterad immediately before discoidal cell; discoidal cell originating at mid-length of wing, 3x longer than wide; median cell slightly shorter than discoidal cell; crossvein r situated basally of R2; fork I originating before crossvein s at distance equal to length of crossvein s; nygma located near base of fork II; fork III 1 /6th as long as wing; fork V as long as fork I, shorter than fork II; Cu2 nearly touching from A at wing margin. Hind wings 4.2 mm (n=1), brown; broad, ratio of length to breadth 2.9; margin weakly incurved at arculus, where Cu1 and Cu2 fused with margin; fork I sessile on discoidal cell, about as long as fork V; fork III about 1.5x longer than discoidal cell and nearly 1/6th as long as wing; 1A+2A 4x longer than 1A.

Male genitalia ( Figs. 100–104 ). Segment IX about as long as high; anterior plates narrowing anterad, pointed apically; posterior 1/2 of segment broad, expanded dorsally, parallelogram shaped, slightly produced dorsad ( Fig. 100 ) and mesad ( Fig. 101 ); each anterodorsal margin widely and deeply concave in lateral view; each ventral margin uniformly convex, without incisions; in lateral view, posterior part of segment IX produced posterad immediately below cercus, into narrow plate with nearly straight, undulating posterior margin; posterior plate with sharp posterodorsal corner. In dorsal view segment IX with long, narrow anterior lobes; in dorsal view anterodorsal margin forming deep, broad, U-shaped incision with anterodorsad orienting processes on posteromesal margins. In ventral view segment IX nearly rectangular, except slightly narrowing anteriorly and weakly convex lateral margins; anterior margin deeply concave; posterior margin slightly concave, with rounded central projection. Tergum X about as long as gonopods and undivided in lateral view; with slightly convex dorsal margin and concave ventral margin. In dorsal view tergum X divided from base into 2 parallel lateral branches, each with apex curved dorsolaterad. Sensillae on tergum X not visible. Cerci short, nearly wart-like, located near dorsal margin of segment IX and ventral margin of tergum X; broad in lateral view, narrow in dorsal view, directed posterad; covered by long setae. Gonopods shorter than segment IX in lateral view; posteriorly exceeding tergum X; with broad base; distal 1/2 about 1/2 as broad as basal 1/2, and slightly curved ventrad; in ventral view with ventromesal margin strongly undulating due to row of erect setal bases; dorsomesal margin smooth, strongly sigmoid, with minute, anteromesad-orienting, strongly sclerotized process. Phallic apparatus 1.5x longer than rest of genitalia, nearly straight, except bent ventrad at mid-length of posterior, slender part of phallotheca; phallotheca, in lateral view, with anterior part 3x thicker than posterior part; in ventral view anterior part 2x wider than posterior part; apicoventral spine absent on phallotheca; phallotremal sclerite formed by complex of cylindrical plates; 2 short, blackish endothecal spines present.

Female. Unknown.

Holotype male: VITI LEVU: Vuda Prov., Koroyanitu N.M.P. Abaca Village, Malaise trap, 6–26.v.2003, 17°40’S, 177°33’E [17.3333°S, 177.55°E], 400 m, leg. M. Irwin, E. Schlinger & M. Tokota’a [loc#01] [ FNIC].

Paratypes: Same data as holotype [loc#01] — 1 male [ BPBM]. Vuda Prov., Koroyanitu N.M.P., Savuione Trail, Malaise trap, 21.ix–7.x.2002, 17°40’S, 177°33’E [17.3333°S, 177.55°E], 450 m, M. Irwin, E. Schlinger & M. Tokota’a [loc#04] — 1 male [ NHRS, DNA voucher IL 5].

Etymology: Abacensis , named after the Abaca village near the type locality.

Distribution: Viti Levu.

Figures

FIGURES 14 – 21. Right wings, dorsal views. 14 — C. tokotaai, new species, holotype; 15 — C. vuda, new species, holotype; 16 — C. naitasirensis, new species, holotype; 17 — C. veisarensis, new species, holotype; 18 — C. fijiana, new species, holotype; 19 — C. abacensis, new species, holotype; 20 — C. manni Banks, non-type; 21 — C. cakaudrovensis, new species, holotype.

FIGURES 100 – 104. Chimarra abacensis, new species, holotype. 100 — genitalia, left lateral view; 101 — genitalia, dorsal view; 102 — genitalia, ventral view; 103 — phallic apparatus, left lateral view; 104 — phallic apparatus, ventral view.