Megaselia cakpoae Disney, 2013

Disney, R. Henry L., Kurina, Olavi, Tedersoo, Leho & Cakpo, Yvonne, 2013, Scuttle flies (Diptera: Phoridae) reared from fungi in Benin, African Invertebrates 54 (2), pp. 357-357 : 359-361

Megaselia cakpoae Disney , sp. n.

Figs 1–6

Etymology: Named for Yvonne Cakpo.

Description:

Male.

Frons yellow to orange brown, clearly broader than long, with 40–60 hairs and dense but very fine microtrichia. Only 2 SAs. Antials lower on frons than ALs, and about as far from SAs as either is from AL. Pre-ocellars at most as far apart as SAs and closer together than either is from ML bristle, which is at about the same height on frons. Cheek with 0–2 bristles and jowl with 2 longer bristles. Subglobose postpedicels yellow, without subcutaneous pit sensilla (SPS vesicles). Palps pale yellow, only about 0.2× as broad as postpedicel and 1.1–1.2× as long as breadth of latter, with 4 short bristles (longest, apical, bristle being 0.08–0.09 mm) and up to twice as many hairs. Labrum pale yellow and about 0.7× as wide as postpedicel. Labella coloured as palps, with 2 or 3 hairs on each above and very few short spinules below. Thorax yellow apart from brown patch on pteropleuron. Three notopleural bristles and no cleft in front of these. Mesopleuron bare. Scutellum with anterior pair of fine hairs (subequal to those in middle of scutum) and posterior pair of bristles. Abdominal tergites yellow apart from brown areas on outer thirds of T3 and T4. T1 to T6 with small hairs, mainly at hind margins and towards the sides, and being longest posterolaterally from T2 onwards and at rear of T6. Venter yellow, with minute hairs on the sides behind spiracles and with small hairs below on segments 3–6. Hypopygium ( Fig. 6 ) mainly brown, with yellow anal tube. Legs yellow apart from brown patches on mid coxae. Fore tarsus with pd hair palisade on segments 1–5, segment 5 very slightly longer than 4. Dorsal hair palisade of mid tibia extends just over 0.75× of its length. Last segment of mid tarsus longer than 4 th (similar to Fig. 19 ). Hairs below basal half of hind femur longer than those of av row of outer half. Base of hind tibia as Figs 1 & 2 , with 6 or 7 differentiated pd hairs beyond the modified basal region and spinules of apical combs simple. Wings 1.60–1.76 mm long. Costal index 0.45–0.47. Costal ratios 3.4–4.9:1.4–2.1:1. Costal cilia (section 3) 0.06–0.07 mm long. No hair at base of vein 3. With 2 axillary bristles, the outer being longer than costal cilia. Sc not reaching R1. Thick veins yellowish grey, thin veins 4–6 grey and 7 pale. Membrane only lightly tinged grey (not obviously evident to naked eye when viewed against a white background). Haltere knob yellow.

Female.

Head similar to male but with 2 or 3 bristles on cheek. Palps up to 1.4× as long as width of postpedicel and with 5 bristles. Labrum 0.9× as wide as diameter of postpedicel. Thorax as male. Abdominal tergites yellow, progressively a little narrower from T2 to T6. Venter yellow, with hairing of segments 3–6 similar to male. Segments 7 and 8 brown, elongated and retractile. Light brown tergite 7 about 4.5× as long as broad, with a pair of longer hairs at rear end and half a dozen shorter ones further forward. Sternite 7 light brown, about 4× as long as broad and with hairing similar to T7. Single lobe at rear of sternum 8 as Figs 5, 6 . Cerci and epiproct as Fig. 3 . Four rectal papillae. Furca not evident. Dufour’s crop mechanism about 4× as long as broad and almost parallel sided with a rounded rear end. Legs similar to male except 5 th segment of mid tarsus being shorter than 4 th; hind tibia not modified in its basal section, so there are about a dozen differentiated posterodorsal hairs. Wing as male except length is 1.61–1.92 mm. Costal index 0.44–0.47. Costal ratios 3.6–4.5:1.5–2.2:1. Costal cilia 0.07 mm. Haltere as male.

Holotype: ♂ BENIN: Kpessou , ex Boletaceae sp. ( TU116073 ), 4.vii, emerged 15–20.vii ( UCMZ, 42-12).

Paratypes and other material examined: 1♂ 1♀ same data as holotype (42-12) ; 1♀ same locality , ex Russula sp. ( TU116063 ), 4.vii, emerged 20–24.vii (42-11) ; 1♀ (1♂ 4♀) same locality , ex Amanita masasiensis Härk & Saarim ( TU116072 ), 4.vi, emerged 13–20.vii (42-12) ; 1♂ Koussanzamou, ex Hygrocybe sp. ( TU116083 ), 5.vii, emerged 20.vii (42-8) ; 1♀ same locality , ex Russula sp. ( TU116095 ), 5.vii, emerged 21.vii (42-8) ; 2♂ 1♀ (15♂ 21♀) same locality , ex Tylopilus sp. ( TU116106 ), 5.vii, emerged 17–20.vii (42-5) ; 3♀ same locality , ex Boletaceae sp. ( TU116118 ), 5.vii, emerged 17–19.vii (42-4) ; 1♂ 1♀ same locality , ex Boletaceae sp. ( TU116120 ), 5.vii, emerged 15–20.vii (42-5) .

Remarks: In Beyer’s (1965) keys the male runs to page 54, couplet 28 to M. tergatula Beyer, 1965 , only known from the female, but the latter has brown postpedicels. Proceeding the male runs to couplet 30, lead 2, to M. nubila Colyer, 1952 , but the latter has brown legs. The female on page 54 runs on to couplet 22, to M. incrassaticosta Bridarolli, 1951 , only known from the male, but its thorax is brown rather than yellow. Proceeding to couplets 24 to 26 based on males only, one can continue on the basis of the costal index or costal cilia being too short for the species of these couplets. It then runs to couplet 30 to M. nubila again.

Figures

Figs 1, 2. Megaselia cakpoae sp. n., ♂, base of hind tibia, anterior (1) and posterior (2) faces.

Figs 3–6. Megaselia cakpoae sp. n., ♀ (3–5) and ♂ (6): (3) epiproct and cerci, (4, 5) lobe at rear of sternum 8 in two different specimens, (6) left face of hypopygium. Scale bar = 0.1 mm.

Figs 17–21. Megaselia tedersooi sp. n., ♂ (17–19) and ♀ (20, 21): (17) posterior face of base of hind tibia, (18) anterior face of same, (19) segments 3–5 of mid tarsus, (20) cerci, (21) lobes at rear of abdominal sternum 8.