Mesembrinella serrata Whitworth

Whitworth, Terry L. & Yusseff-Vanegas, Sohath, 2019, A revision of the genera and species of the Neotropical family Mesembrinellidae (Diptera: Oestroidea), Zootaxa 4659 (1), pp. 1-146: 132

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Mesembrinella serrata Whitworth

sp. nov.

Mesembrinella serrata Whitworth   , sp. nov.

( Figs 89–90 View FIGURES 87–92 , 179–180 View FIGURES 173–182 , 232 View FIGURES 229–235 , 275 View FIGURES 266–279 , 319 View FIGURES 318–323 , 363 View FIGURES 350–369 , 404 View FIGURES 401–410 , 448 View FIGURES 439–453 , 480 View FIGURES 479–483 )

Diagnosis. A small fly averaging 9.2 mm (8–10/5) in length. Wing with section IV 0.44 of section III; distal 2/3 of wing along costa faintly infuscated; subcostal sclerite with long tan setae; abdomen bluish with faint white tomentum; usually kat 1:1. Male: epiphallus of normal length ( Fig. 179 View FIGURES 173–182 ); hypophallic lobes broad, pear-shaped in dorsal view, with coarse serrations ( Fig. 180 View FIGURES 173–182 ). Female T6 of WV shape ( Fig. 319 View FIGURES 318–323 ), with suture midway.

Description. Male. Head. Frons 0.028 (0.025 –0.030 /2) of head width at narrowest. Fronto-orbital, parafacial and gena yellow-gold; frontal vitta dark red; frontal setae ascending about 30% of distance to vertex, to where frontal vitta is obliterated; gena with horizontal row of brown setae midway, otherwise with small, scattered brown setae; postgena yellow with fine yellow setae; occiput dark with pale yellow tomentum and fine yellow setae; median occipital sclerite shiny dark brown; antenna entirely orange with whitish tomentum, arista tan; palpus typical; eye with median facets 4x size of lateral facets; ocellar triangle small, anterior ocellus 2x size of posterior ocelli; row of long tan supravibrissal setae ascending about 1/8 of distance to antennal base.

Thorax. Dorsum dark brown with golden brown tomentum and a pair of brown lateral tomentose stripes with presutural stripe midway; pleura mostly orange with golden tomentum; chaetotaxy: ac 2:1, dc 2:3, ia 1, ph 1, ppn 3x 3, kat 1:1, rarely 2:1, meral setae typical, 1 pair of converging ap, sa and lat absent, 1 stout bas, 1 weak pb, 1 disc; subscutellum moderately developed; spiracles orange, medium-sized; legs: femora orange, tibiae and tarsi brown. Wing with distal 2/3 of costa faintly infuscated; subcostal sclerite with long tan setae; basicosta and tegula orange; section IV 0.44 of section III; disc of upper calypter pale with brown rim and short tan setae; lower calypter with yellowish disc and dark brown rim with long tan setae.

Abdomen. T1+2–3 mostly dark orange, rear of T3 bluish; T4–5 shiny blue with faint white tomentum; rear margins of T4 and T5 with stout marginal setae dorsolaterally, no setae mid-dorsally; disc of T5 bare. Terminalia in lateral view with surstylus as in Fig. 89 View FIGURES 87–92 ; in posterior view, cerci very robust, pear-shaped, narrowed above, broadest midway and tapering distally to broad tips ( Fig. 90 View FIGURES 87–92 ); phallus in lateral view with medium-long, slender epiphallus with small backward curve ( Fig. 179 View FIGURES 173–182 ); in dorsal view, hypophallic lobes broad, pear-shaped, with coarse serrations along edge ( Fig. 180 View FIGURES 173–182 ). T6, STS7+8, pre- and postgonite, ejaculatory sclerite and ST6 as in Fig. 232 View FIGURES 229–235 ; ST2–5 as in Fig. 275 View FIGURES 266–279 .

Female. Similar to male except frons 0.238 (0.28–0.29/3) of head width at narrowest. T6 of WV shape with suture midway; T7 divided midway; T8 as separate sclerites ( Fig. 319 View FIGURES 318–323 ); ST6–8 and hypoproct as in Fig. 363 View FIGURES 350–369 ; spermathecae filiform ( Fig. 404 View FIGURES 401–410 ); ST1–5 as in Fig. 448 View FIGURES 439–453 .

Type material. HOLOTYPE ♂* ( Peru , Madre de Dios; CNC; Fig. 480 View FIGURES 479–483 ), labeled: Avispas [= Avispa], Madre / de Dios, PERU / 20 - 30.IX.1962 / L. Pena. 400m.   ; HOLOTYPE / Mesembrinella   / serrata / T.L. Whitworth.

ALLOTYPE ♀: Peru, Madre de Dios. Avispas [= Avispa], 20–30.ix. 1962, 400 m, L. Pena ( CNC).  

PARATYPES: Peru, Madre de Dios. 1 ♂, 1 ♀ *, Avispas [= Avispa], 20–30.ix. 1962, 400 m, L. Pena ( CNC)   ; 1 ♀, same data except 1–15.x.1962 ( CNC)   .

Distribution. Peru.

Remarks. No specimens were barcoded.

Etymology. The species name serrata   is derived from the Latin serra (= saw), and refers to the distinctive serrations along the edge of the hypophallic lobes.


Canadian National Collection of Insects, Arachnids, and Nematodes