Megaselia reduncus Disney, 2020

Disney, R. Henry L. & Durska, Ewa, 2020, New Species And New Records Of Megaselia Rondani (Insecta: Diptera: Phoridae) From Wigry National Park (Poland), Annales Zoologici 70 (1), pp. 97-108 : 104-106

Megaselia reduncus Disney , sp. nov.

( Figs 62–74 )

Description (Male). In the key to the males of the species of Megaselia recorded from the British Isles

( Disney 1989) it runs to couplet 199 lead 1 M. costalis von Roser, the type species of the genus Megaselia . However, this species was described from its highly distinctive female only. The recognition of its male had been long confused before being clarified by (Disney 1995), with figures of its hypopygium and that of M. brunneipennis (Costa) , whose female is also highly distinctive. Thus the species running to couplet 199 is the latter species, and its hypoppygium is different from the species described below. Of 2 omitted species running to couplet 199 one has brown haltere knobs and M. latericia Schmitz has the anal tube very much shorter than the epandrium. In the key to Borgmeier’s (1966) Nearctic Group VII it runs to couplets 2 lead 2 M. longipennis (Malloch) (with a costal index 0.42–0.46 and a longer anal tube), couplet 9 lead 1 M. pymaeoides (Lundbeck) and couplet 10 lead 1 M. berndseni Schmitz. The latter has brown femora. With regard to M. pygmoides, Borgmeier had misidentified M. agarici (Lintner) as this species (which has 3 bristles on the notopleuron and brown hind femora), and prior to the description of the male of M. abdita (under its synonym M. griseipennis ref Disney, 1987, ICZN, 2012; 12), these two species were being confused. Furthermore, the Nearctic M. agarici and Arabian and Oriental M. sandhui have also been confused ( Disney 2008).

Male. Frons as Fig. 62 , with dense but very fine microtrichia. Cheek with 2 bristles and jowl with 2 that are longer and more robust. Postpedicels, which lack SPS vesicles, palps and proboscis as Fig. 63 , the labella with numeros short spinules below ( Fig. 64 ). Thorax as Fig. 65 , with 2 notopleural bristles and no cleft in front of these, and mesopleuron bare. Scutellum with an anterior pair of small hairs and a posterior pair of bristles. Abdominal tergites as Fig. 66 , with a pale venter with hairs on segments 3–6. Hypopygium as Figs 67–70 , with a left hypandrial lobe and the tip of the right paraphysis curving upwards. Legs yellow but the hind femora with brown tips ( Fig. 73 ). Fore tarsus ( Fig. 71 ) with posterodorsal hair palisade on

segments 1–4 and 5 just longer than 4 ( Fig. 72 ). Dorsal hair palisade of mid tibia extends about 0.73 times its length. Hairs below basal half of hind femur longer than those of anteroventral row of outer half ( Fig. 73 ). Hind tibia with 10–11 moderately differentiated posterodorsal hairs, without anterodorsals, and spinules of apical combs simple. Wings ( Fig. 74 ) 1.6 mm long. Costal index 0.36. Costal ratios 3.0: 1.4: 1. Costal cilia (of section 3) 0.09 mm long. Vein 3 hair 0.05 mm long. 3 axillary bristles, the outermost being 0.13 mm long. Sc reaching R1. Haltere knob pale ( Fig. 74 ).

Type material. Holotype male, Poland, Wigry National Park , in emergence trap in plot 4BA without Impatients parviflora DC, IX. 2018, E. Durska leg. ( MIZ PAS, – 28–61).

Etymology. Named after the recurved ( reduncus ) tip of the right paraphysis.

Figures

Figures 62–74. Megaselia reduncus Disney, sp. nov.. male. 62 – frons; 63 – antennae, palps and proboscis; 64 – proboscis from below; 65 – side of thorax; 66 – left face of thorax and abdomen; 67 – left view of hypopygium; 68 – left view of epandrium; 69 – left view of hypandrium; 70 – ventral view of hypandrium; 71 – front tarsus; 72 – segments 4 and 5 of front tarsus; 73 – hind femur; 74 – wing.