Megaselia vestfoldensis, DISNEY, 2020

DISNEY, R. Henry L., 2020, Scuttle flies (Diptera: Phoridae) from the canopies of ash trees in Norway, with six new species, Fragmenta Faunistica 63 (1), pp. 29-45 : 40-42

Megaselia vestfoldensis n. sp.

( Figs 57–65 )

Diagnosis (male). In the key to the males of Megaselia from the British Isles ( Disney 1989) it runs to couplet 214 then by a return loop to couplet 156, where the hypopygium differs from both options. However, this group of species was revised by Buck & Disney (2001). In their key it runs to couplet 7 lead 2 – undescribed species – at least 4 species requiring better specimens.

Male. Frons as Fig. 57 , with very fine microtrichia but mainly towards the edges and next the median furrow. Cheek with 4 bristles and jowl with 2 that are much longer and 58, the postpediocels with numerous SPS vesicles. Thorax brown. Two notopleural bristles and a cleft in front of these ( Fig. 59 ). Mesopleuron bare. Scutellum with an anterior pair of small hairs and a posterior pair of bristles. Abdominal tergites and venter as Fig. 60 , the latter with hairs on segments 3–6. Hypopygium as Figs 61–62 , the hypandrium lacking a right lobe. Legs brown. Fore tarsus with posterodorsal hair palisade on segments 1–4 and 5 clearly longer than 4 ( Fig. 61 ). Dorsal hair palisade of mid tibia extends about 0.79 times its length. Hairs below basal half of hind femur subequal to those of anteroventral row of outer half ( Fig. 64 . Hind tibia ( Fig. 64 ) with a dozen differentiated posterodorsal robust bristles apart from the first 2–3 being more much finer, without anterodorsals, and spinules of apical combs simple. Wings ( Fig. 65 ) 1.23 mm long. Costal index 0.41. Costal ratios 2.97: 1.40: 1. Costal cilia (of section 3) 0.07 mm long. Vein 3 hair 0.06 mm long. 3 axillary bristles, the outermost being 0.09 mm long. Sc not reaching R1. Haltere pale whitish yellow.

Material. Holotype male, Norway, Vestfold, Horten , 59.3656º N, 10.4606º E; 18 Jul 2018, J. Svetlik & L. Børjia (11A, UCMZ, 39–92).

Etymology. Named after the type locality.

Figures

Figs 57-63. Megaselia vestfoldensis n. sp. male. 57 - frons; 58 - postpedicels, palps and proboscis; 59 - notopleuron; 60 - left face of abdomen; 61 - left face of hypopygium; 62, - right face of hypopygium; 63 - front tarsus.

Figs 64-65. Megaselia vestfoldensis n. sp. male. 64 - hind femur and tibia; 65 – wing.