Megaselia necrubida, 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 : 23-24

Megaselia necrubida n. sp.

( Figs 52–60 )

Diagnosis (male). In the keys to British species ( Disney 1989) it runs to couplet 150, where neither lead fits. In Schmitz & Delage’s (1981) keys to Abteiling VI it runs to couplet 47 lead 2, to the male attributed to M. rubida (Schmitz) by Lundbeck (1922). The latter is immediately distinguished by its brownish abdominal venter, the brown tip to the hind femur and costal section 1 being about equal to sections 2+3. M. rubida was described from the female only. Its description was amplified by Buck & Disney (2001). Its costal ratios correspond to those of Lundbeck’s male.

Male. (the abdomen was full of air bubbles whose expulsion caused some damage to the hypopygium). Head as Fig. 52 , the frons having dense but very fine microtrichia. Palps yellow, with 6 bristles and fewer hairs. Labella narrow and pale. Thorax yellowish brown to brown.

The 3 notopleural bristles and bare mesopleuron as Fig. 53 . Scutellum with 4 strong bristles ( Fig. 54 ). Abdominal tergites brown with moderate hairs even at the rear of T6 ( Fig. 55 ). Venter yellow and with hairs on segments 3–6. Hypopygium as Figs 55–57 , with the left lobe of the hypandrium being pale and the right lobe vestigial. Legs yellow. Fore tarsus with posterodorsal hair palisade on segments 1–5 and 5 longer than 4 ( Fig. 58 ). Dorsal hair palisade of mid tibia extends about 0.9 times its length. Hind femur as Fig. 59 . Hind tibia with a dozen differentiated posterodorsal hairs, without anterodorsals, and spinules of apical combs simple. Wing ( Fig. 60 ) 1.8–1.9 mm long. Costal index 0.47. Costal ratios 5.1: 3.1–3.2: 1. Costal cilia (of section 3) 0.10 mm long. No hair at base of vein 3. With 3 axillary bristles, the outer being 0.12 mm long. Sc reaching R1. Haltere knob yellow.

M a t e r ia l e xa mi n e d. Holotype male, Finland, Ab : Turku , Satava, Samppa, 67015: 32387, mixed forest 9 Jul 2016, K. Winqvist leg. (14/16, UCMZ, 34-192).

E t y m o l o g y. Named after its resemblance to Megaselia rubida .

Figures

Figs 52–53. Megaselia necrubida n. sp. male: 52 – head; 53 – left face of thorax.

Figs 54–60. Megaselia necrubida n. sp. male: 54 – right side of scutellum; 55–57 – hypopygium; 58 – front tarsus; 59 – hind femur; 60 – wing.