Claustropyga clavulata, Hippa, Heikki & Vilkamaa, Pekka, 2016

Hippa, Heikki & Vilkamaa, Pekka, 2016, New species of Claustropyga Hippa, Vilkamaa & Mohrig (Diptera, Sciaridae) from the Holarctic region, Zootaxa 4088 (4), pp. 594-600 : 595-596

Claustropyga clavulata sp. n.

Figs 1 A–E

Material studied. Holotype male. CANADA, Yukon Territory, Ogilvie Mts., North Fork Pass, 4100 ft, 20.vi.1962, R.E. Leech (in CNC).

Male. Colours faded in the specimen studied. Head. Eye bridge 2 facets wide. Face with 6 scattered longer and shorter setae. Clypeus non-setose. Maxillary palpus with 3 segments; segment 1 longer than segments 2 and 3, subequal in length; segment 1 with 1 long sharp seta, with a dorsal group of sensilla; segment 2 with 1 long sharp seta and 2 shorter truncate setae, segment 3 with 4 short truncate setae. Antenna ( Figs 1 A, B). Body of antennal flagellomere 4 1.5 x as long as wide, the neck shorter than broad, the longest setae shorter than the width of flagellomere, in the holotype, segmentation on the basal part of right and apical part of left flagellum abnormal ( Fig. 1 A, B). Thorax. Anterior pronotum with 3 setae. Episternum 1 with 4 setae. Wing. Length 2.0 mm. Width/ length 0.45. R1/R 0.65. c/ w 0.70. r-m and bM non-setose. Halter pale brown. Legs. Front tibial organ ( Fig. 1 C) with vestiture in short indistinct row. Front tibial spur as long as the tibial width. Abdomen. Setae dark. Hypopygium ( Fig. 1 E). Intercoxal area produced, slightly lobe-like with two groups of dense setae, medially about as long as gonocoxite at the base of gonostylus; gonocoxa longer than gonostylus, with short setosity; gonostylus ( Fig. 1 D) elongate, broadened towards apex, medially impressed on basal half with short setosity, bearing a short apical tooth, one lateral and 5–7 subapical megasetae, megasetae spine-like, subequal in length. Tegmen as long as broad, with rounded lateral sides.

Discussion. Claustropyga clavulata is not especially similar to any other species of the genus. In our key to the species of Claustropyga (Vilkamaa & Hippa 2007) , it runs to couplet 9, leading to C. brevichaeta (Mohrig & Antonova, 1978) , C. abblanda (Freeman, 1983) and C. aperta Hippa, Vilkamaa & Mohrig 2003 . It fits C. brevichaeta concerning the short gonostylar setae, and C. abblanda and C. aperta by having the gonostylar megasetae in one unbroken group on its apical half. C. clavulata is distinguished from the aforementioned species by its unusual club-like gonostylus. The latter character alone distinguishes C. clavulata from all other described Claustropyga .

Female. Unknown.

Etymology. The name is Latin, clavulata (with small clubs), referring to the club-shaped gonostylus of the species.

Figures

FIGURE 1. Claustropyga clavulata sp. n. (holotype). A. Antennal flagellomeres 13 and 14, ventral. B. Antennal pedicel and flagellomeres 1, 2 and 3, ventral. C. Apex of front tibia, prolateral. D. Gonostylus, ventral. E. Part of hypopygium, ventral. Scale 0.1 mm.