Camptochaeta anceps Vilkamaa & Mohrig

Vilkamaa, Pekka, Hippa, Heikki & Heller, Kai, 2013, Review of the genus Camptochaeta Hippa & Vilkamaa (Diptera, Sciaridae), with the description of nine new species, Zootaxa 3636 (3), pp. 476-488 : 477-478

Camptochaeta anceps Vilkamaa & Mohrig sp. n.

Figs 1 A, B

Material studied. Holotype male. FRANCE, Corsica, Zonza, pine forest with alder, oak, chestnut on beach, sweep-net, 25.V.1994, Röschmann (no. 3297 in PWMP).

Description. Male. Head. Brown, antenna paler brown, maxillary palpus very pale brown. Eye bridge, face and clypeus not well seen in the specimen studied. Maxillary palpus with 3 palpomeres, not well seen in the specimen. Body of antennal flagellomere 4 2.75x as long as wide, the neck shorter than broad, the longest setae as long as the width of flagellomere. Thorax. Brown, setae dark. Anterior pronotum with 4 setae. Episternum 1 with 6 setae. Wing. Length 1.7 mm. Wing distorted, width not seen in the specimen studied. R1/R 0.85. c/ w 0.65. r-m and bM subequal in length, r-m/bM 1.1, r-m with 2 dorsal setae, bM non-setose. Halter pale brown. Legs. Pale yellowish brown. Coxal setae dark. Front tibial organ in depression with vestiture in patch. Front tibial spur slightly longer than the tibial width. Abdomen. Brown, as thorax. The setae dark. Hypopygium, Figs 1 A, B. Brown, paler than abdomen. Gonocoxa slightly longer than gonostylus. Gonostylus with the mesial side strongly impressed; apicomesially with a few elongated setae; with apical tooth, with 2 apical megasetae, with 2 mesial megasetae on a common basal body at the basal half, the mesial megaseta larger than the apical ones, all slightly curved; with a flagellate seta on the dorsal side of mesial megasetae. Tegmen broader than long, with roundish lateral sides, sclerotized at the lower 2/3.

Discussion. The specimen is in poor condition, with parts of the hypopygium broken or missing ( Fig. 1 A). Camptochaeta anceps differs from all other Camptochaeta in having its gonostylus strongly narrowed towards the apex and in having two mesial megasetae of the gonostylus in an unusual basal position and close to each other on a common basal body. Of the reminiscent species of Camptochaeta , C. uniformis (Mohrig & Menzel, 1990; see Menzel et al. 1990) has the mesial megasetae of the gonostylus on a common basal body, but its gonostylus is evenly broad. Camptochaeta anceps , C. kajsae , C. formosa and C. sicilicula Hippa & Vilkamaa, 1994 all have a broad tegmen with large roundish lateral sides. Camptochaeta kajsae , C. formosa and C. sicilicula can be distinguished from C. anceps , not only in the different form of the gonostylus, but also in not having the mesial megasetae of the gonostylus on a common basal body. In C. kajsae and C. formosa , the mesial megasetae are rather straight and close to each other, whereas in C. sicilicula they are curved and wide apart. Furthermore, C. kajsae has only one or two apical megasetae on its gonostylus and a longer tegmen, while C. formosa has a subapical megaseta on the basal side of the apical tooth and a shorter and broader tegmen ( Figs 3 and 4 ).

Etymology. The name is Latin, anceps , two-headed, referring to the strongly bilobed apex of the gonostylus.

Figures

FIGURE 1. Camptochaeta anceps sp. n. (holotype). A. Part of hypopygium, ventral view. B. Gonostylus, ventral view. Scale 0.10 mm.

FIGURE 3. Camptochaeta formosa sp. n. (holotype). A. Part of hypopygium, ventral view. B. Gonostylus, ventral view. Scale 0.10 mm.

FIGURE 4. Camptochaeta kajsae sp. n. (holotype). A. Part of hypopygium, ventral view. B. Gonostylus, ventral view. Scale 0.10 mm.