Claustropyga lobigera, 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 : 596-597

Claustropyga lobigera sp. n.

Figs 2 A–C

Material studied. Holotype male. FINLAND, Regio kuusamoensis, Kuusamo, Kotioja (7367629:3608877), brook, Malaise trap, 1–20.vi.2006, J. Salmela (in MZH).

Male. Head. Brown, antenna paler, maxillary palpus very pale brown. Eye bridge 2 facets wide. Face with 8 scattered longer and shorter setae. Clypeus non-setose. Maxillary palpus with 2 or 3 segments; segment 1 longer than segment 3, segment 2 shortest; segment 1 with 2 long sharp setae, with a dorsal group of sensilla; segment 2 with 1 long sharp seta and 2 shorter truncate setae, segment 3 with 5 short truncate setae. Body of antennal flagellomere 4 1.4 x as long as wide, the neck shorter than broad, the longest setae longer than the width of flagellomere. Thorax. Anterior pronotum with 2 setae. Episternum 1 with 1 seta. Wing. Length 1.4 mm. Width/ length 0.40. R1/R not detectable in the specimen. c/ w 0.70. r-m and bM non-setose. Halter pale brown. Legs. Front tibial organ with vestiture in indistinct patch. Front tibial spur slightly longer than the tibial width. Abdomen. Setae dark, rather short. Hypopygium ( Fig. 2 A). Intercoxal area not lobe-like, with slightly denser setae than gonocoxite, medially about as long as gonocoxite at the base of gonostylus; gonocoxa slightly longer than gonostylus, with normal setosity; gonostylus ( Figs 2 B, C) swollen, medially strongly concave, with normal setosity, some longer setae medially, bearing a short apical tooth, and 3 apical-subapical and 1 medial megaseta, megasetae slender, straight or slightly procurved, subequal in length. Tegmen long, conical, with a pair of apicodorsal finger-like lobes.

Female. Unknown.

Discussion. Claustropyga lobigera shares its unusual structure of the tegmen with only one other species in the genus, the Nearctic C. mirifica Vilkamaa & Hippa, 2007 . In both species, the tegmen has a dorsal pair of long narrow lobes, the posterior part of which are freely visible beyond the normal posterior margin of the tegmen. In C. lobigera , these freely visible parts are rather short and broad, in C. mirifica they are long narrow, and finger-like. The species differ greatly in the characters of the gonostylus, C. lobigera having an apical tooth and lacking a large ventral medial lobe with 3 marginal megasetae. In its gonostylus, C. lobigera greatly resembles the Nearctic C. triloba Vilkamaa & Hippa, 2007 , except for having only one medial megaseta instead of two, at the middle of the gonostylus. Curiously enough, no unusual lobes on the tegmen of the latter can be seen.

Etymology. The name is Latin, lobigera (bearing a lobe), referring to the ear-like apical lobes on the tegmen of the species.

Figures

FIGURE 2. Claustropyga lobigera sp. n. (holotype). A. Part of hypopygium, ventral. B. Gonostylus, ventral. C. Apical part of gonostylus, dorsal. Scale 0.1 mm.