Macrostomus polleti Rafael & Vasconcelos 2024, sp. nov.
Creators: name: Rafael, José Albertino
name: Vasconcelos, Manuela Santos
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Empididae
Macrostomus
Macrostomus polleti

description: Macrostomus polleti sp. nov.
(Figs 3A–I, 4A–F, 5)
urn:lsid:zoobank.org:act: 784CFBA7-3F32-4DB4-A44B-82ACDC440F70
Diagnosis. Yellow to brown, except postcranium black; male fore tarsomere 1 not thickened, whitish; wing brown, distinctly hyaline spotted; cell r 1 with small hyaline spot at level of cell dm spot. Abdomen darker with blue reflection; tergite 8 rounded distally, without distal projection. Posterior cercus thin, upward directed. Hypandrium thin distally, posterior margin with a distinct median acute process. Female: Mid femur, hind femur, and hind tibia with dorsal and ventral pennate scales; sternite 8 (Fig. 4D, E) with distal half uniformly narrowed, with no median sinus laterally. Genital fork thin, elongated, Y-shaped, with lateral arms slightly shorter than basal arm.
Description. Holotype male. Body length 4.8 mm; wing length 4.5 mm. Male (Fig. 3A) identical to previous species, except by frons dichoptic as wide as anterior ocellus width, wider than face; halter with knob whitish; fore tarsomere 1 not thickened, somewhat whitish. Hind tibia with 6 longer dorsal setae. Wing (Fig. 3B) distinctly spotted; cell r 1 with small hyaline spot at level of cell dm spot (Figs 3B, 4B). Abdomen shiny black with blue reflection. Tergite 8 (Fig. 3C–D) rounded distally. Terminalia (Fig. 3E–H) concolorous with abdomen. Epandrium with anterodorsal and posterodorsal lobe same height; anterior cercus upward directed, with narrow median cercal bridge (Fig. 3E, F); posterior cercus slender, elongated, upward directed (Fig. 3E, G). Hypandrium (Fig. 3H) with small somewhat translucent spot basally, distal half of hypandrium thin, posterior margin with distinct median acute process (Fig. 3H). Ejaculatory apodeme tetralamellar (Fig. 3H). Phallus slender (Fig. 3H).
Female. Habitus (Fig. 4A). Body 4.7 mm; wing 4.6 mm. As in males, except mid femur, hind femur, and hind tibia with dorsal and ventral pennate scales; wing slightly wider than in male (Fig. 4B). Abdomen entirely shiny black, including terminalia less shining than in male and sparsely gray pruinose. Terminalia (Fig. 4C–F). Tergite 8 (Fig. 4C) slightly concave basally, deeply concave apically. Sternite 8 (Fig. 4D, E) with distal half uniformly narrowed, with no median sinus laterally. Genital fork (Fig. 4D) Y-shaped, with lateral arms as long as basal arm and somewhat straight. Spermatheca (Fig. 4F) spherical.
Variations. Male body varying from 4.5–4.8 mm; 3–4 dorsocentral setae; 3–4 antepronotals; 2–5 proepisternals; Amapá specimens with thorax yellow-brown; Mitaraka specimens with thorax brown, halter with knob whitish and terminalia slightly black.
Geographical records. Brazil (Amapá, Serra do Navio, Oyapock); French Guiana (Mitaraka).
Material examined. HOLOTYPE ♂, labelled: “BRASIL, Terr. [Território] Amapá, Serra do Navio [0°53′N 52°0′W], 14.x.1957, J. Lane leg,”, “Holotype ♂, Macrostomus polleti ”, “ MZUSP ” (Fig. 3I). PARATYPES: Brazil: Same data as holotype, except: 26.ix.1957 (1♂ MZUSP); Amapá, Oiapoque, BR 156, km 25, 3°39′35″N 51°46′17″W, iii–vii.2020, Malaise, floresta, J.A. Rafael, S.P. Lima & F.F. Xavier F° (1♂ INPA). French Guiana: Mitaraka, 02°13′59.8″N 54°27′46.5″W, 471 m, partially opened areas on savanna, roche 2, 13–20.viii.2015, MT [Malaise trap] (6m), leg. Pierre-Henri Dalens –sample code: Mitaraka /230 (1♂, 1♀ MNHN).
Holotype condition. Mounted, in good condition, not dissected.
Etymology. The specific name is in honor of Dr. Marc Pollet, coordinator of the French Guiana project in Mitaraka.
description: Published as part of Rafael, José Albertino & Vasconcelos, Manuela Santos, 2024, A new species-group of Macrostomus (Diptera, Empididae) with notable spotted wings recorded from the North Amazonia biogeographical component and a key to species-groups, pp. 429-438 in Zootaxa 5433 (3) on pages 433-435, DOI: 10.11646/zootaxa.5433.3.9, http://zenodo.org/record/10954401