Megaselia dostrupensis, Henry & Bøggild, 2021

Henry, R. & Bøggild, Esben, 2021, Nineteen new species of Megaselia Rondani (Diptera, Phoridae) from Denmark, Zootaxa 4975 (2), pp. 306-342 : 310

Megaselia dostrupensis n. sp.

( Figs 25–34 )

Diagnosis. In the key of Lundbeck (1922) to Group VI it runs to couplet 7 lead 1 M. longiseta (Wood) which is immediately distinguished by its distinctive hind femur. An uncommon feature of our species is the left hypandrial lobe is vestigial but the right lobe is well developed. In the key to the males of species from the British Isles ( Disney, 1989) it runs to couplet 256 where lead 1 almost applies but the figures of the hypopygia referred to rule out this option. Lead 2 proceeds to couplet 258 lead 2, but is ruled out as it has 3 not 2 notopleural bristles. However, a note says if neither lead applies proceed to couplet 264, where lead 1 proceeds to couplet 265 and thence via lead 1 to couplet 266, where lead 1 is excluded by its hypopygium. Proceeding to 267 both options are excluded by their hypopygia, and by the number of notopleural bristles or the extent of vein Sc. Of excluded species M. intergeriva Schmitz runs to couplet 258, but its hypopygium clearly differs (Fig, 4 in Disney, 2011a). It fails to run down in keys for the rest of the world’s fauna and subsequent additions.

Description. Male. Frons as Figs 25 and with the very fine microtrichia extending all over, and the upper SAs being a little further apart than the pre-ocellars. Cheek seemingly with a single bristles and jowl likewise but it is longer and more robust. The postpedicels, which lack SPS vesicles, palps and proboscis as Fig. 26 . Labella with about 20 short spinules below each ( Fig. 27 ). Thorax brown. With 3 notopleural bristles and no cleft in front of these. Mesopleuron bare. Scutellum with an anterior pair of small hairs and a posterior pair of bristles. Abdomen as Fig. 28 , with tergite hairs a little longer at rear of T6 and venter with hairs on segments 3–6. Hypopygium as Figs 29–31 , with the anal tube more than 1.5 times as long as the dorsal face of the epandrium. Legs yellowish to yellow. Fore tarsus ( Fig. 32 ) with posterodorsal hair palisade on segments 1–5 and 5 longer than 4, and basitarsus with 2 rows of hairs reduced to small spinules. Dorsal hair palisade of mid tibia extends about 0.65 times its length. Hairs below basal half of hind femur longer than those of anteroventral row of outer half. ( Fig. 33 ). Hind tibia with a dozen differentiated posterodorsal hairs, without anterodorsals, and spinules of apical combs simple. Wings ( Fig. 34 ) 1.20 mm long. Costal index 0.46. Costal ratios 3.4: 1.8: 1. Costal cilia (of section 3) 0.07 mm long. No vein 3 hair. With 2 unequal axillary bristles, the outer one being 0.09 mm long. Sc not reaching R1. Haltere brown ( Fig. 28 ).

Type material. Holotype male, DENMARK, DK NEJ, Døstrup Simested Å, 10.VII–13.VIII.2016, Esben Bøggild ( UCMZ —9–24).

Etymology. Named after the type locality.

Figures

FIGURES 25–34. Megaselia dostrupensis n. sp. male. 25, frons; 26, antennae, palps and proboscis; 27, ventral face of proboscis; 28, abdomen; 29, left view of hypopyium, 30, hypopygium from right; 31, left hypandrial lobe; 32, front tarsus; 33, hind femur; 34, wing.