Chimarra karoyanitensis, 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 : 25-26

Chimarra karoyanitensis , new species

Figs. 13 , 70–74

Chimarra karoyanitensis resembles C. schlingeri , C. macuatensis , and C. signata in having gonopods each with a long, slender, ventrally hooked dorsal process. It is most similar to C. macuatensis in the overall shapes of segment IX, tergum X, the gonopods, and the phallic apparatus. In lateral view, the gonopods of C. karoyanitensis are broadest at mid-length, while in the other species the gonopods are broadest well beyond mid-length, as far out as the origin of the dorsal branch. It is distinguished from C. macuatensis by the ventral branch of each gonopod posteriorly exceeding the dorsal branch, the longer ventral branches of tergum X, and the more rounded anterior lobes of segment IX in lateral view. It is distinguished from C. schlingeri by the gonopods that are clearly longer than broad. It is separated from C. signata by the straight posterior margins of segment IX in lateral view, and smaller dorsal branch of each gonopod relative to the ventral branch.

Male. Body yellowish brown, dorsal part of meso and metathorax brown. Large dark area between lateral and anterior ocelli. Foreleg anterior claw as long as foreleg spur.

Wings ( Fig. 13 ). Forewings 5.6 mm (n=1), brown; ratio of length to breadth 3.3; R1 nearly slightly undulating before crossvein r; radial sector slightly produced anterad immediately before discoidal cell; discoidal cell originating at mid-length of wing, 2x longer than wide; median cell slightly shorter than discoidal cell; crossvein r situated at base of fork I; fork I originating before crossvein s at distance equal to 1/3rd length of crossvein s; nygma located near base of fork II; fork III 1 /5th as long as wing; fork V slightly longer than fork I, shorter than fork II; Cu2 close to A at wing margin. Hind wings 4.5 mm (n=1), brown; broad, ratio of length to breadth 3.1; fork I with short footstalk, footstalk nearly as long as crossvein s; margin slightly incurved at arculus, where Cu1 and Cu2 fused with margin; fork III slightly longer than discoidal cell and 1/7th as long as wing; fork V slightly shorter than fork I; 1A+2A 2x longer than 1A.

Male genitalia ( Figs. 70–74 ). Segment IX slightly shorter than high, nearly L-shaped in lateral view; anterior plates with large, nearly oval dorsal lobe, and small triangular lobe; posterior 1/2 of segment expanded dorsally; each anterodorsal margin deeply concave in lateral view; each ventral margin slightly convex, without incision at vertical apodeme; each posterior margin nearly straight, slightly undulating, angled 90° below cercus. In dorsal view segment IX with short, wide anterior lobes; anterodorsal margin forming shallow, wide, U-shaped incision without anterad-orienting processes on posteromesal margins. In ventral view segment IX nearly quadrangular, except narrow before anterior 1/3rd; anterior margin widely concave; posterior margin straight, with short, wide central projection. Tergum X divided into dorsal and ventral branches, surrounding phallic apparatus. Tergum X with nearly straight dorsal margin in lateral view; dorsal branches rounded triangular, angled nearly 90° at posterior end; in dorsal view each lateral branch fused at base, 1/2 as wide as segment IX. Pair of ventral branches of tergum X smooth, slightly sigmoid an oriented posterad in lateral view; straight and diverging posterolaterad in dorsal view. Sensillae on tergum X not visible. Cerci located at dorsal margin of segment IX; straight, oriented posterodorsad in lateral view; covered by long setae. Gonopods slightly oval, broadest at mid-length, about as long as segment IX; dorsal margin convex, ventral margin nearly straight; 2-branched; exceeding tergum X by length of cercus. Each dorsal branch slender, as long as individual cercus, strongly curved ventrad along its length, forming ventral hook; apex nearly as far out as apex of ventral branch; in dorsal view nearly straight, pointing posteromesad; mesal megasetae absent. Ventral branch of each gonopod nearly hyperbolic in lateral view, with undulating posterior and ventral margin; each with mesal margin strongly undulating in ventral view. Mesal branches absent. Phallic apparatus slightly longer than rest of genitalia, nearly straight; phallotheca, in lateral view, with anterior part 3x thicker than posterior part; in ventral view anterior part about 2x wider than posterior part; apicoventral spine absent on phallotheca; phallotremal sclerite not observed; 2 long, nearly black endothecal spines present.

Female. Unknown.

Holotype male: VITI LEVU: Vuda Prov., Koroyanitu Natural Heritage Park, Savuione Trail, Malaise trap, 12–19.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] [ FNIC].

Paratypes: Same data as holotype, except: 21.ix–7.x.2002 [loc#04] — 2 males [ NHRS]. Viti Levu, Vuda Prov., Koroyanitu Pk., 1 km E Abaca Vlg., Malaise trap 1, 7–12.x.2002, 17.667°S, 177.55°E, 800 m, leg. E. Schlinger & M. Tokota’a [loc#03] — 2 males [ BPBM]. Same data, except: 19–26.x.2002 [loc#03] — 1 male [ NHRS]. Same data, except: 26.x–5.xi.2002 [loc#03] — 2 males [ BPBM]. Same data, except: 26.xi–3.xii.2002 [loc#03] — 3 males [ NHRS]. Same data, except: 10–17.xii.2002 [loc#03] — 1 male [ FNIC].

Etymology: Karoyanitensis , named after Koroyanitu Natural Heritage Park, the type locality of the species.

Distribution: Viti Levu.

Figures

FIGURES 6 – 13. Right wings, dorsal views. 6 — C. vanuensis, new species, holotype; 7 — C. macuatensis, new species, holotype; 8 — C. signata Banks, 1936, non-type; 9 — C. schlingeri, new species, holotype; 10 — C. nathani, new species, holotype; 11 — C. braueri, new species, holotype; 12 — C. vitiensis, new species, holotype; 13 — C. karoyanitensis, new species, holotype.

FIGURES 70 – 74. Chimarra karoyanitensis, new species, holotype. 70 — genitalia, left lateral view; 71 — genitalia, dorsal view; 72 — genitalia, ventral view; 73 — phallic apparatus, left lateral view; 74 — phallic apparatus, ventral view.