Megaselia turkuensis, DISNEY & WINQVIST, 2018

DISNEY, R. Henry L. & WINQVIST, Kaj, 2018, New records including new species of Megaselia Rondani and Triphleba Rondani (Diptera: Phoridae) from Finland, Fragmenta Faunistica 61 (1), pp. 11-33 : 25-27

Megaselia turkuensis n. sp.

( Figs 61–70 )

Dia gno sis (male). In the keys to British species ( Disney1989) it runs to couplet 260. If one ignores the first part of lead 1 then one is returned to couplet 156. This is the section revised by Buck &Disney (2001), in whose key to males it runs to couplet 2, where neither option applies. However, a note suggests that the unknown male of M. septentrionalis (Schmitz) might run to this couplet, but it has a yellow haltere knob in contrast to the new species. M. turkuensis fails to run down in Borgmeier’s (1966) relevant keys to Nearctic species.

Male. (with damaged head and hypopygium). Frons brown, clearly broader than long, with 60–70 hairs and dense but very fine microtrichia. SAs robust but lower pair shorter. The antials lower on frons than anterolaterals, and about as far from upper SAs as either is from an AL bristle. Pre-ocellars further apart than upper SAs but about equidistant from each other and as either is from a mediolateral bristle, which is about the same level on frons. Cheek with 5 bristles and jowl with a longer one. Postpedicels with SPS vesicles ( Fig. 61 ). Palps and proboscis as Fig. 61 , with the lower faces of labella as Fig. 62 . Thorax brown. Two notopleural bristles and a cleft in front of these ( Fig. 63 ). Mesopleuron bare ( Fig. 63 ). Scutellum with an anterior pair of hairs and a posterior pair of bristles ( Fig. 64 ). Abdominal tergites brown with numerous hairs that are longest at the rear of T6. Venter brown, and with hairs on segments 3–6. Hypopygium as Figs 65–67 . Legs brown but parts of front legs yellowish brown or paler. Fore tarsus as Fig. 68 . Dorsal hair palisade of mid tibia extends about 0.8 times its length. Hind femur as Fig. 69 . Hind tibia with a dozen moderately differentiated posterodorsal hairs and a longer pre-apical, without anterodorsals, and spinules of apical combs simple. Wings ( Fig. 70 ) 1.6 mm long. Costal index 0.44. Costal ratios 3.4: 2.0–2.1: 1. Costal cilia (of section 3) 0.09 mm long. Hair at base of vein 3 small. With 3 axillary bristles, the outer being 0.11 mm long. Sc not reaching R1. Haltere brown.

M a t e r i a l e x a m i n e d. Holotype male, Finland, Ab : Turku, Ilpoinen, 67081:32404, 3 Jun 2014, K. WinqvisT ( UCMZ, 34-163).

E t y m o l o g y. From the type locality of the holotype.

Figures

Figs 61–64. Megaselia turkuensis n. sp. male: 61 – postpedicels (ruptured), palps a proboscis; 62 – labellum from below; 63 – notopleuron with cleft; 64 – right side of scutellum.

Figs 65–70. Megaselia turkuensis n. sp. male: 65–67 – hypopygium; 68 – front tarsus; 69 – hind femur; 70 –wing.