Chimarra signata Banks

Johanson, Kjell Arne & Oláh, János, 2012, Revision of the Fijian Chimarra (Trichoptera, Philopotamidae) with description of 24 new species, Zootaxa 3354, pp. 1-58 : 17-19

Chimarra signata Banks

Figs. 8 , 32 , 45–49

Chimarrha signata Banks, 1936: 35 .

Chimarra signata resembles C. macuatensis , C. schlingeri , and C. karoyanitensis 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. It is distinguished from C. macuatensis in that the gonopods each have a ventral branch that extends beyond the dorsal branch; and in that the gonopods are shorter than segment IX in lateral view.

Male. Body 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. 8 ). Forewings 4.1 mm (holotype), brown; large pale membranous area located centrally in wing, basally crossvein r-m, in basal 1/2 of discoidal cell, immediately anteriorly of basal part of discoidal cell, and in median cell; forewings relatively narrow, ratio of length to breadth 3.3; R1 undulating before crossvein r; radial sector produced anterad immediately before discoidal cell; discoidal cell originating immediately after mid-length of wing, 2x longer than wide; median cell slightly longer than discoidal cell; crossvein r situated at base of R2; fork I originating at shortly before crossvein s at a distance equal to 1/2 length of s; nygma located basally in fork II; fork III 1 /6th as long as wing; fork V slightly shorter than fork I, shorter than fork II; Cu2 situated distantly from A at wing margin. Hind wings 3.1 mm (holotype), brown, with large pale hyaline spot located between R and M and basally of crossvein r-m; wings broad, ratio of length to breadth 3.1; margin slightly incurved at arculus, where Cu1 and Cu2 fused with margin; fork I with stalk about as long as R3; fork III absent; fork V 1.4x longer than fork I; 1A+2A nearly 4x longer than 1A.

Male genitalia ( Figs. 45–49 ). Segment IX clearly taller than long, nearly J-shaped in lateral view; anterior plates large, triangular, pointing anteriad at apex; dorsal part of segment slightly expanded anteriorly; each anterodorsal margin concave in lateral view, with nearly straight innermost margin ( Fig. 45 ); each ventral margin straight after anterior lobe, with weak incision at vertical apodeme; each posterior margin slightly convex, smooth. In dorsal view segment IX with long, slender anterior lobes; anterodorsal margin forming wide, U-shaped incision; each side with short, rounded, anterad-orienting process ( Fig. 46 ). In ventral view segment IX divided into broad posterior part with parallel lateral sides; and narrower anterior part with posteriorly diverging lateral sides; anterior margin widely and deeply concave; posterior margin nearly straight, without central projection. Tergum X divided into small dorsal and large ventral branches, almost completely fused, surrounding phallic apparatus; dorsal margin of dorsal branch nearly straight in lateral view; 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; in lateral view narrowing apically into dorsal hook; in dorsal view each dorsal branch forming rounded, posterolaterad oriented lobe; in dorsal view, each ventral branch bent laterad before apex. Cerci located at posterodorsal margin of segment IX; straight, oriented posterad in lateral and dorsal view; covered by long setae. Gonopods widening distally from narrow basis, shorter than segment IX; dorsal margin sigmoid, concave basally, convex distally; ventral margin nearly straight. Each gonopod 2-branched; clearly exceeding tergum X by length equal to breadth of gonopod. Each dorsal branch slender, as long as individual cercus, strongly curved ventrad along its length, forming ventral hook; apex not reaching as far out as apex of ventral branch; in ventral view curved mesad into pointed apex; posterior margin with long, slender and short, stout setae; megasetae absent. Ventral branch of each gonopod oval in lateral view, with smooth posterior and ventral margins; each branch with irregular mesal margin in ventral view. Mesal branches absent. Phallic apparatus about 2x longer than rest of genitalia (with endotheca extruded), nearly straight; phallotheca, in lateral view, with anterior part thicker than posterior part; in ventral view anterior part about as wide as posterior part (probably collapsed); apicoventral spine absent on phallotheca; phallotremal sclerite not observed; 2 very long, slender, nearly black endothecal spines present.

Female. Unknown.

Holotype male: “Fijis: Taviuni, Somo Somo. W. M. Mann ”; “M.C.Z. Type 22047”; “ Chimarrha signata type Bks”. Abdomen macerated, in glycerol in micro vial on same pin as rest of animal [ MCZ].

Additional material examined: TAVEUNI: Cakaudrove Prov., Lavena, Malaise trap, 4.i–11.iii.2004, 16°51.315’S, 179°53.323’W, 213 m, leg. M. Irwin, E. Schlinger & M. Tokota’a [loc#40] — 1 male [ FNIC]. VANUA LEVU : Macuata Prov., Dogotuki, 2.5 km E Nasavu River, Malaise trap, 7.vii.2003, 16.2519°S, 179.7833°E, 226 m, leg. M. Irwin, E. Schlinger & M. Tokota’a [loc#28] — 1 male [ BPBM]. Macuata Prov., Rokosalase, Malaise trap in forest, 26.iii–9.iv.2004, 16°31.891’S, 179°01.147’E [16.5315°S, 179.0192°E], 105 m, leg. M. Irwin, E. Schlinger & M. Tokota’a [loc#27] — 1 male [ NHRS, DNA voucher IK7]. Bua Prov., 6 km NW Kilaka, Malaise trap, 15–24.vi.2004, 16.8067°S, 178.9914°E, 98 m, leg. E. Schlinger & M. Tokota’a [loc#25] — 1 male [ BPBM].

Distribution: Taveuni.

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 32 – 34. Type specimens of Chimarra described by Banks. 32 — C. signata Banks, 1936, holotype; 33 — C. manni Banks, 1924, lectotype; 34 — C. obscurella Banks, 1924, holotype.

FIGURES 45 – 49. Chimarra signata Banks, 1936, holotype. 45 — genitalia, left lateral view; 46 — genitalia, dorsal view; 47 — genitalia, ventral view; 48 — phallic apparatus, left lateral view; 49 — phallic apparatus, ventral view.