Camptochaeta exquisita, Vilkamaa & Menzel, 2017

Vilkamaa, Pekka & Menzel, Frank, 2017, Descriptions of new species of the genera Camptochaeta Hippa & Vilkamaa and Corynoptera Winnertz (Diptera, Sciaridae) from the Holarctic, Zootaxa 4353 (2), pp. 347-359 : 350-351

Camptochaeta exquisita sp. n.

Fig. 3 A, B

Material studied. Holotype male. USA, Oregon, Benton Co., 6.4 mi up Woods Creek Road from Jct Hwy 20, Malaise trap, 24.VI–14.VII.2014, S. Fitzgerald (in MZH) . Paratypes. Same data as holotype, 1 male (in SDEI); same data as holotype but 10.VI–22.VIII.2015, 1 male (in MZH); USA, Oregon, Linn Co., Hackleman Creek , 0.6 mi E of Tombstone Pass, 44.397501°N, 122.131401°W, Malaise trap, 1.VIII–22.IX.2016, S. Fitzgerald, 1 male (in MZH).

Description. Male. Head. Face and antenna concolorous brown, maxillary palpus very pale brown. Eye bridge 3 facets wide. Face with 5–6 scattered longer and shorter setae. Clypeus with 1 pale seta or non-setose. Maxillary palpus with 3 segments; lengths of segments not detectable in the specimens studied, segment 1 with 1–2 sharp setae, with an irregular pale shallow pit of sensilla, body of 4th antennal flagellomere 3.8–4.0x as long as wide, surface smooth, neck as long as wide, the longest setae longer than width of flagellomere. Thorax. Brown, setae dark. Anterior pronotum with 6 setae. Proepisternum with 7–8 setae. Wing. Fumose. Length 2.4–2.5 mm. Width/ length 0.40–0.45. Anal lobe moderate. R1/R 0.90–0.95. c/w 0.75–0.80. Veins distinct; stM slightly shorter than fork of M, bM shorter than r-m, r-m with 1–9 dorsal setae, bM non-setose. Halter pale brown. Legs. Pale brown. Coxal setae pale or dark. Fore tibial organ with dark vestiture in large demarcated patch in depression. Fore tibial spur subequal to the tibial width. Abdomen. Pale brown, setae dark and rather long and strong. Hypopygium ( Fig. 3 A ). Pale brown, concolorous with abdomen. Gonocoxa longer than gonostylus, narrow, gonocoxae separated, with dark and strong setosity, medially setae pale, fine and short. Gonostylus ( Fig. 3 B ) strongly narrowed apically, with the medial side strongly impressed; apicomesially with a few elongated setae; with strong and long apical tooth, with a megaseta on the lateral, one megaseta on the ventral side of apical tooth, and one long megaseta with a long socket just on the basoventral side of the tooth, megasetae nearly straight; with 2–3 flagellate setae. Tegmen small, apically notched, with sclerotized rim, apodemes directed laterad, with an area bearing many strong aedeagal teeth. Aedeagal apodeme short.

Discussion. In having a very long apical tooth with a long adjacent megaseta, Camptochaeta exquisita resembles C. falcidens Hippa & Vilkamaa, 1994 , C. filifera Vilkamaa, Hippa & Heller, 2013 , C. inflata Hippa & Vilkamaa, 1994 and C. mutua ( Johannsen, 1912) . In its slender gonostylus, C. exquisita resembles most forms with a narrow gonostylus of the variable C. mutua (see Hippa & Vilkamaa 1994) but differs in having its apical tooth not membranous, relatively longer, and in having only three, not four megasetae, all very close to the apical tooth. Furthermore, Camptochaeta exquisita has a more slender gonocoxa and a smaller tegmen, in this character resembling C. inflata .

Etymology. The name is Latin, exquisita , excellent, referring to the long and elegant apical tooth and megasetae of the gonostylus.

Figures

FIGURE3. Camptochaeta exquisitasp.n. (holotype).A. Part of hypopygium,ventral.B. Gonostylus, ventral.Scale 0.10 mm.