Megaselia kajaaniensis, 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 : 19-21

Megaselia kajaaniensis n. sp.

( Figs 33–41 )

Diagnosis (male). In Schmitz’s (1957) key to Abteilung II species it runs to couplets 20 and 21 on page 432. M. intonsa Schmitz is immediately distinguished by its lack of hairs on segments 3 and 4 of the abdominal venter and its costal index being clearly less than 0.5. M. palmeni (Becker) also lacks hairs on segments 3 and 4 of the venter and has fewer bristles on the epandrium. The other three species are readily distinguished by their very different hypopygia. In the key to British species ( Disney 1989) it runs to couplet 55, lead 1 to M. palmeni .

Male. Head as Fig. 33 , with dense but very fine microtrichia. Cheek with 5 bristles and jowl with two that are longer and more robust. Postpedicels without SPS vesicles. Palps pale brown or darker, with 6 bristles, a dozen hairs and small circular pits on their outer faces. Labrum pale and small. Labella pale and lacking short spinules below. Thorax brown. Three notopleural bristles and no cleft in front of these. Mesopleuron with 5–7 hairs and a bristle. Scutellum with an anterior pair of hairs, a posterior pair of bristles and a pair of small hairs ( Figs 34–35 ). 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 36–37 . Middle and hind legs brown. Front legs, apart from brown bases to coxae, yellow. Fore tarsus as Fig. 38 , with the basitarsus as Fig. 39 . Dorsal hair palisade of mid tibia extends about 0.65 times its length. Hind femur as Fig. 40 . Hind tibia with a dozen moderately differentiated posterodorsal hairs, without anterodorsals, and spinules of apical combs simple. Wings 1.3–1.6 mm long. Right wing of paratype as Fig. 41 but left wing lacks the cross vein linking veins 4 and 5 (as in normal phorid wings). Vein 7 not evident. Costal index 0.45–0.53. Costal ratios 3.5–4.2: 1.3– 1.4: 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 not reaching R1 . Haltere brown.

Material examined. Holotype male, Finland, Ok: Kajaani , Otanmäki , 21 Jul 2015, 71086:35050, K. Winqvist leg. ( UCMZ, 34-186 ) . Paratype male, Ok: Kajaani, Pirttikangas, 71076:35052, 22 Jul 2015, K. Winqvist leg. (UCMZ, 34-188).

Etymology. Named after the type locality.

Comment. The cross vein in one wing of the paratype is a further case of a mutation restoring a plesiomorphic state (cf Disney 1985, 1991).

Figures

Figs 33–35. Megaselia kajaaniensis n. sp. male: 33 – head; 34–35 – scutellum.

Figs 36–41. Megaselia kajaaniensis n. sp. male: 36–37 – hypopygium; 38 – front tarsus, 39 – basitarsus of front tarsus; 40 – hind femur; 41 – right wing of paratype.