Cheimacheramus rossi, Johanson, Kjell Arne & Oláh, János, 2006

Johanson, Kjell Arne & Oláh, János, 2006, Eleven new species of Sericostomatoidea from Madagascar (Trichoptera: Helicopsychidae, Petrothrincidae, Sericostomatidae), Zootaxa 1205, pp. 1-30 : 20-22

Cheimacheramus rossi , new species

Figs 47–50 , 60

This new species is close to C. caudalis from which it is easily separated by having the antennal scape longer, almost 2x longer than broad; wings narrower; and in the male genitalia IXth sternum less strongly produced posteriorly, and tergum X shorter, straight and less deeply bifurcate at apex.

Body pale brown. Antennal scape about 2x longer than wide. Maxillary palp with 1 segment, slender, falciform, cylindrical. Head interantennal setal warts absent, cephalic setal warts long reniform, postocular setal warts long. Pronotum with 1 pair long setal warts, mesoscutum with and 1 pair small rounded setal warts, mesoscutellum with 1 pair long longitudinal setal warts.

Male wings ( Fig. 47 ). Forewing length 5.0 mm, hind wing length 4.0 mm. Denuded wing membrane pale with pale flavous veins. Both forewings and hind wings without discoidal cell, anterior and posterior margins of both wings nearly parallel­sided along their lengths.

Male genitalia ( Figs 48–50 ). Segment IX nearly as long as high, anterior lobe nearly hyperboloid with shallowly concave dorsal and ventral margins ( Fig. 48 ), posterior margin straight, except deeply concave dorsally above superior appendage, sternum IX short with backwardly directed mesial lobe ( Fig. 50 ). Xth tergum sharply triangular in lateral view ( Fig. 48 ), with straight dorsal and ventral margins, nearly as long as segment IX; in dorsal view slightly tapering toward shallowly bifid apex ( Fig. 49 ). Superior appendage base hidden behind segment IX in lateral view ( Fig. 48 ), nearly tuboid; in dorsal view ( Fig. 49 ) weakly curving laterally. Gonocoxite divided into broad dorsal lobe and conical posterior lobe ( Fig. 48 ), ventral margin nearly straight; in lateral view, dorsal lobe oriented anterodorsally, apically rounded with posterior spine; in ventral aspect ( Fig. 50 ) gonocoxite weakly sinusoidal, gradually narrowing toward slightly inward pointed apex; median spine of dorsal lobe directed inward at right angle to length of gonocoxite ( Fig. 50 ). Phallus forming a very long tube of uniform diameter throughout length, slightly down­curving distally, basal part more strongly sclerotized than distal part.

Etymology. In a handwritten letter Prof. R. Paulian wrote that originally the material he collected in Madagascar was sent to Prof. Herbert H. Ross before his demise. The name of this new species is dedicated to Ross, who was unable to work on the material.

Holotype male: MADAGASCAR: Sa Mandraka, Province Tamatave, x. 1956 [R. Paulian] (MNHN, in alcohol).

Figures

FIGURE 60. Map of Madagascar showing distributions of Sericostomatidae spp.: Rhoizema mahalevonum (rectangle); and Cheimacheramus rossi (circle).

FIGURES 47 – 50. Cheimacheramus rossi, new species, holotype. Male genitalia: 47 — right wings; 48 — genitalia, lateral; 49 — genitalia, dorsal; 50 — genitalia, ventral.