Mesembrinella chantryi Whitworth & Yusseff-Vanegas 2019, sp. nov.
Creators: name: Whitworth, Terry L.
name: Yusseff-Vanegas, Sohath
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Calliphoridae
Mesembrinella
Mesembrinella chantryi

description: Mesembrinella chantryi Whitworth, sp. nov.
(Figs 69–70, 159–160, 222, 265, 309, 353, 394, 438, 474, 488)
Diagnosis. A medium-sized fly averaging 11.8 mm (11–13/5) in length. Postpronotal lobe with 3x 3 setae; stem vein bare; wing hyaline with faint yellowing along costa; subcostal sclerite with long, reddish wiry setae; section IV of wing 0.46 of section III. Male: epandrium and cerci with unusually stout with dark setae (Figs 69–70).
Description. Male. Head. Frons narrow, 0.02/3 of head width at narrowest, narrower than anterior ocellus; fronto-orbital yellow with whitish tomentum; frontal vitta reddish with white tomentum, obliterated midway; frontal setae ascending about 30% of distance to vertex; parafacial golden when viewed from above and below; gena yellow with whitish tomentum, horizontal row of stout dark setae and few scattered dark setae; postgena yellow with golden setae; palpus typical; eye with median facets about 2x size of lateral facets; occiput with pale tomentum and yellow setae; median occipital sclerite shiny dark orange; pedicel reddish, first flagellomere orange, arista tanocellar triangle tiny, anterior ocellus 2x size of posterior ocelli; only a small cluster of dark brown supravibrissal setae at base of facial ridge.
Thorax yellow-orange with whitish tomentum and irregular tomentose stripes; chaetotaxy: ac variable, 2:1 most common but 1:2 and 1:1 also found, dc 2:3, ia 1, ph 1, ppn 3x 3, kat 1:1, meral setae very weak, in straight vertical line, sometimes with one or two horizontally-arranged setae, 1 pair converging ap, 1 sa, 2 lat, 1 stout bas, 1 weak pb, 1 disc; subscutellum moderately developed; spiracles yellowish, medium-sized; femora yellow, tibiae and tarsi brown. Wing mostly hyaline, area along costa yellowed; both calypters pale; subcostal sclerite with long, reddishbrown setae; basicosta yellow with dark pubescence, tegula yellow; section IV 0.46 of section III; frontal setae ascending about 30% way of distance to vertex.
Abdomen. Anterior half of T1+2 yellowish; posterior half of T1+2 and T3–5 bluish with heavy whitish tomentum and dark pit-like spots around setal pockets (similar to Fig. 103); posterolateral area of T4 with 4 or 5 stout setae on each side; disc of T5 with dense, fine setae only. Terminalia with unusually stout, dark setae; in lateral view with surstylus slender with slight backward bend, cercus with apical hook (Fig. 69); in posterior view, cerci broad at base, tapering to chisel-like tip (Fig. 70). Phallus in lateral view with short, stout epiphallus with slight backward curve (Fig. 159); in dorsal view, basiphallus with curved horn-like projections directed posteriorly; hypophallic lobes broad and pear-shaped with coarse serrations along edge (Fig. 160); T6, STS7+8, pre- and postgonite and ejaculatory sclerite as in Fig. 222; ST–5 with ST1–2 broad and ST3–4 small, as in Fig. 265.
Female. Similar to male except frons 0.272 (0.26–0.30/5) of head width at narrowest. T6 of RV shape; T7 narrowed midway with V-shaped incision on posterior edge; T8 as separate sclerites; epiproct with separate sclerites (Fig. 309); ST6–8 and hypoproct as in Fig. 353; spermathecae filiform (Fig. 394); ST1–5 as in Fig. 438.
Type material. HOLOTYPE ♂* (French Guiana; USNM; Fig. 474), labeled: French Guiana Kaw Mt. / 04°33ʹ58”N 52°12ʹ43”W / 8.ii.2008 Bait Trap 310m / T.L. Whitworth. HOLOTYPE / Mesembrinella / chantryi / T.L. Whitworth.
ALLOTYPE ♀ ♦ (TLW312): same data as holotype (USNM).
PARATYPES: Brazil, Amazonas. 1 ♂*, Rio Negro, Mirapinima, 8.iv.1972, E.G. & E.A. Munroe (CNC). French Guiana. 1 ♂, 1 ♀ ♦* (TLW313), 2 ♀♀ ♦ (TLW314 – TLW315), 2 ♀♀ *, 6 ♀♀, Kaw Mountain, 04°33ʹ58”N 52°12ʹ43”W, 310 m, 8.ii.2008, T.L. Whitworth (USNM); 2 ♀♀, Amazone Nature Lodge, 30 km SE Roura on Kaw Rd, 300 m, 5–19.ii.2010, J.E. Eger (FSCA); 1 ♂, 1 ♀, Mitaraka Expedition, 02°14ʹ02ʺN 54°27ʹ01ʺ, 300 m, iii.2015, Marc Pollet (USNM).
Distribution. French Guiana, Brazil.
Remarks. The terminalia of M. chantryi sp. nov. are similar to those of M. batesi, and these two species also share the heavy, irregular whitish tomentose spots on the abdomen; however, M. chantryi has a hyaline wing, vs. the dark infuscation along the costa in M. batesi. Three males and 12 females were found for M. chantryi. Most specimens examined were from the same location in French Guiana. A single male specimen from northern Brazil (about 700 km SW of French Guiana) was dissected and appears to belong to the same species. Three specimens (TLW 312–314) were successfully barcoded and clustered together, close to M. batesi (Fig. 488).
Etymology. The species name chantryi was chosen to honor Corey Chantry, a friend of TW and a dedicated amateur entomologist who collected with TW on the trip to French Guiana when this species was discovered.
description: Published as part of Whitworth, Terry L. & Yusseff-Vanegas, Sohath, 2019, A revision of the genera and species of the Neotropical family Mesembrinellidae (Diptera: Oestroidea), pp. 1-146 in Zootaxa 4659 (1) on pages 121-122, DOI: 10.11646/zootaxa.4659.1.1, http://zenodo.org/record/3377239