Chimarra macuatensis, 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 : 15-17

Chimarra macuatensis , new species

Figs. 7 , 40–44

Chimarra macuatensis resembles C. schlingeri , C. karoyanitensis , and C. signata in having gonopods with a long, slender, ventrally hooked dorsal process. It is most similar to C. karoyanitensis in the overall shapes of segment IX, tergum X, the gonopods, and the phallic apparatus. It is distinguished from C. karoyanitensis in that the gonopods are broadest well beyond mid-length, as far out as the origin of the dorsal branch; in that the ventral branch of each gonopod does not exceed the dorsal branch; in that the ventral branches of tergum X are shorter; and in that the anterodorsal lobes of segment IX are pointed in lateral view. It is distinguished from C. schlingeri by having gonopods that are clearly longer than broad. It is distinguished from C. signata in that the ventral branch of each gonopod does not exceed beyond the dorsal branch, and in that the dorsal branch of each gonopod is small relative to the ventral branch.

Male. Body pale 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. 7 ). Forewings 4.9 mm (n=1), dark brown; large pale membranous area located distantly of crossvein r-m, in basal 1/2 of discoidal cell, and immediately anteriorly of basal part of discoidal cell; forewings relatively narrow, ratio of length to breadth about 3.1; R1 nearly sigmoid before crossvein r; radial sector produced anterad immediately before discoidal cell; discoidal cell originating at mid-length of wing, 2x longer than wide; median cell as long as discoidal cell; crossvein r situated at base of fork I; fork I originating at crossvein s; nygma located slightly distant from base of fork II; fork III 1 /5th as long as wing; fork V about as long as fork I, shorter than fork II; Cu2 nearly fusing with A at wing margin. Hind wings 4.0 mm (n=1), dark brown, without pale hyaline spots; broad, ratio of length to breadth 2.9; margin slightly incurved at arculus, where Cu1b and Cu2 fused with margin; fork I with short stalk as long as discoidal cell; fork III as long as discoidal cell and 1/9th as long as wing; fork V slightly longer than fork I; 1A+2A nearly 2x longer than 1A.

Male genitalia ( Figs. 40–44 ). Segment IX slightly taller than long, nearly J-shaped in lateral view; anterior plates large, thorn-shaped, curved dorsad at apex; posterior 1/2 of segment expanded dorsally; each anterodorsal margin deeply concave in lateral view; each ventral margin strongly convex, without incision at vertical apodeme; each posterior margin strongly convex, smooth. In dorsal view segment IX with long, slender anterior lobes; anterodorsal margin forming wide, U-shaped incision; each side with short, rectangular, anterad-orienting process on posteromesal margin. In ventral view segment IX nearly diamond-shaped, narrow before anterior 1/3rd; anterior margin widely and deeply concave; posterior margin shallowly concave, without central projection. Tergum X divided into dorsal and ventral branches, surrounding phallic apparatus. Tergum X with slightly convex, membranous dorsal margin in lateral view; dorsal branches short, rounded; in dorsal view each lateral branch separate at base. Pair of ventral branches of tergum X smooth, except pair of sensillae on each side, near ventral margin; narrowing apically in lateral view and oriented posterad; in dorsal view oriented slightly laterad, broad. Cerci located at dorsal margin of segment IX; straight, oriented posterodorsad in lateral view; covered by long setae. Gonopods slightly widening distally, about as long as segment IX; dorsal margin slightly convex, ventral margin nearly straight; 2-branched; clearly exceeding tergum X by length equal to breadth of gonopod. Each dorsal branch slen- der, longer than individual cercus, strongly curved ventrad, forming downcurved apicodorsal hook longer than apex of ventral branch; broad in ventral view, slightly curved mesad into pointed apex, lacking mesal megasetae. Ventral branch of each gonopod nearly hyperbolic in lateral view, with undulating posterior and smooth ventral margins; with irregular mesal margin in ventral view. Mesal branches absent. Phallic apparatus slightly longer than rest of genitalia, nearly straight; phallotheca, in lateral view, with anterior part nearly 4x thicker than posterior part; in ventral view anterior part nearly 3x wider than posterior part; apicoventral spine absent on phallotheca; phallotremal sclerite not observed; 2 very long, slender, nearly black endothecal spines present.

Female. Unknown.

Holotype male: VANUA LEVU : Macuata Prov., Rokosalase, Malaise trap in forest, 8–21.vi.2004, 16°31.891’S, 179°01.147’E [16.5315°S, 179.0191°E], 105 m, leg. M. Irwin, E. Schlinger & M. Tokota’a [loc#27] [ FNIC].

Distribution: Vanua Levu.

Etymology: Macuatensis , named after the Macuata Province, the type locality of the species.

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 40 – 44. Chimarra macuatensis, new species, holotype. 40 — genitalia, left, lateral view; 41 — genitalia, dorsal view; 42 — genitalia, ventral view; 43 — phallic apparatus, left lateral view; 44 — phallic apparatus, ventral view.