Camptochaeta mixta Vilkamaa, Hippa & Heller, 2013, sp. n.

Camptochaeta mixta sp. n.

Figs 5 A, B

Material studied. Holotype male. RUSSIA, Yakutiya, Lena River delta, Samoylov, yellow trap, 2.VIII.1998, Zöllner (in MZH). Paratype. 1 male, same data as holotype (no. 3060 in PKHH).

Description. Male. Head. Brown, antenna slightly paler brown, maxillary palpus very pale brown. Eye bridge 3 facets wide. Face with 6–8 scattered longer and shorter setae. Clypeus with 1 dark seta. Maxillary palpus with 3 palpomeres; palpomere 1 longer than 3, palpomere 2 shortest; palpomere 1 with 1 long sharp seta, with a distinct dorsal patch of sensilla; palpomere 2 with 1 long sharp seta and 4 shorter truncate setae, palpomere 3 with 6 short truncate setae. Body of antennal flagellomere 4 2.25–2.5x as long as wide, the neck shorter than long, the longest setae as long as the width of flagellomere. Thorax. Brown, setae pale. Anterior pronotum with 6 setae. Episternum 1 with 10–12 setae. Wing. Length 1.7–1.8 mm. Width/length 0.40. R1/R 0.60–0.70. c/ w 0.85. r-m and bM variable in length, r-m/bM 0.95–1.20, r-m with 2 dorsal setae, bM non-setose. Halter pale brown. Legs. Pale brown. Coxal setae pale. Front tibial organ in depression with vestiture in patch. Front tibial spur slightly longer than the tibial width. Abdomen. Pale brown, setae dark and long. Hypopygium, Figs 5 A, B. Brown, concolorous with abdomen. Gonocoxa longer than gonostylus. Gonostylus with the mesial side impressed; apicomesially with a few elongated setae; with narrow apical tooth on long basal body or lobe, with 2 apical megasetae, one on long basal body, with 2 mesial megasetae on basal body, all megasetae subequal, straight; with a flagellate seta basad of the mesial megasetae. Tegmen longer than broad, conical, with weak lateral sclerotizations.

Discussion. Camptochaeta mixta can be distinguished from all other congeneric species by its unique characteristics: the apex of the gonostylus is narrow and bifid, one lobe bearing the apical tooth and a megaseta, the other a megaseta as if on a long basal body, and a high conical tegmen. Camptochaeta hirtula (Lengersdorf, 1934) has a reminiscent tegmen, but has four, not two, mesial megasetae on its gonostylus. The apical tooth of C. mixta itself is peculiar, unlike any other species, being abruptly narrowed at its middle.

Etymology. The name is Latin, mixta, mixed, referring to the hypopygium, showing resemblance to Claustropyga Hippa Vilkamaa & Mohrig, 2003 and Xylosciara Tuomikoski, 1957.