Macrostomus gurupi sp. nov.

urn:lsid:zoobank.org:act: 81D36B97-E29F-4B4B-9755-DFB260546918

(Figs 62–77)

Etymology. The specific epithet name is a noun in apposition and refers to the Reserva Biológica do Gurupi, where the specimens were collected.

Diagnosis. Predominantly yellow (Fig. 62). Thorax with 4 antepronotal setae and 1 stout supra-alar presutural seta. Abdominal tergites 3–5 with brown median spot (Fig. 62) and tergite 8 entirely brown (Figs 66, 67). Tergite 8 subtriangular (Fig. 67), with elongated, blunt distal projection. Epandrium with short, rounded posterodorsal lobe, with long and stout dense setae (Fig. 69). Median cercus with a rounded, serrated margin, with long, stout setae (Fig. 70). Hypandrium with a pair of membranous projections distally (Figs 76, 77).

Holotype ♂ (Fig. 62). Body length 4.0 mm, wing length 3.4 mm.

Description. Head (Figs 63, 64). Narrowly dichoptic. Frons shiny, black, narrow, slightly narrower than width of anterior ocellus. Face ventrally narrow, narrower and lighter than frons, black, sub-shiny, with gray pruinosity. Postcranium shiny, black, with sparse gray pruinosity. Inner vertical setae same length of ocellar setae and approximately 2.0X longer than the outer vertical setae; the latter same length of uniserial postocular row of setae. Gena and postgena with 2 setae, with gray pruinosity. Antenna velvety brown, with scape and pedicel paler, light brown; pedicel with ring of dark setae distally. Proboscis slightly longer than head height, yellow. Palpus light brown with 2 long setae, 1 subproximal ventral and 1 distal.

Thorax (Fig. 62). Yellow. Thoracic chaetotaxy: 4 antepronotals; 2 postpronotals, anterior one minute and posterior one stouter; 4 dorsocentrals, posterior pair longer; 2 notopleurals, anterior minute, posterior about 2.5X longer and stouter than anterior; 2 proepisternals minute; 2 scutellars, lateral weaker than subdistal; 6 laterotergals, long and distinct.

Legs (Fig. 62). Predominantly yellow, brown at following points: (i) distal 1 / 7 of hind femur, (ii) distal 1 / 3 of hind tibia and (iii) entire tarsus. Hind femur with 2 short, stout setae on ventral surface of distal 1 / 3. Hind tibia increased in diameter distally, with 4 long, stout dorsal setae. Hind tarsus with 1 long, stout seta.

Wing (Fig. 65). Almost hyaline, except costal cell, pterostigma region and distal end of cell r 2+3 and indistinctly apex of cell r 4+5, brown. Veins M 1, M 2 and CuA + CuP evanescent distally. Distal section of M 4 about 1 / 2 length of crossvein dm-m. Halter light brown, knob brown.

Abdomen (Fig. 62). Mainly yellow, except for tergites 3–5 with brown median spot; tergite 8 and terminalia entirely brown. Tergite 8 distinctly curved in lateral view (Fig. 66); subtriangular in dorsal view, with elongated projection ending in small median break (Fig. 67). Sternite 8 (Fig. 68) U-shaped basally in ventral view, with longer and stout setae distally.

Male Terminalia. Epandrium (Fig. 69) subtrapezoidal in lateral view, with short inconspicuous anterodorsal break; anterodorsal lobe short and robust, slightly acuminate; posterodorsal lobe subequal in length to anterodorsal lobe, somewhat rounded, with stouter setae. Anterior cercus (Figs 70–72) elongated, medially folded, with wider proximal half; distal half narrowed, with longer setae. Cercal bridge (Figs 73–75) fused to proximal half of anterior cercus; anterior margin bifid, posterior margin slightly sinuous in dorsal view. Median cercus (Fig. 70) with rounded, serrated anterior margin, with stouter setae distally. Posterior cercus (Figs 70–72) subtriangular, sclerotized with small mesial subrectangular lobe. Subepandrial sclerite (Figs 71, 72, 74, 75) narrow in anterior view, V-shaped. Hypandrium (Figs 76, 77) narrowed, elongated, with posterior setae basally and pair of membranous projections distally. Ejaculatory apodeme tetralamellar (Fig. 76). Phallus as long as hypandrium, cylindrical, distal end sharply tapered and curved.

Female. Unknown.

Type material. HOLOTYPE ♂ (pinned, all legs in glass microtube,terminalia in microtube) deposited at CZMA: Brazil, MA [= Maranhão], C.[=Centro] N. [=Novo] [do] Maranhão, REBIO-Res. [=Reserva] Biol.[=Biológica] [do] Gurupi. Trilha 1, 03°37'35.4"S- 46°48'55.8"W \ Armadilha MALAISE (Grande), 14–24.ii.2022, F. Limeira-de-Oliveira, A. Tôrres & E. S. Pessoa, cols [=collectors] / PROTAX\ FLO 6777 . PARATYPES: idem, 14–24.ii.2022, idem \ FLO 6783 (pinned, in bad condition, terminalia in microtube) (1♂, MNRJ); idem \ FLO 6784 (pinned, in bad condition, terminalia in microtube) (1♂, INPA) .

Variation. Hind tibia with 3–4 long and strong dorsal setae.

Geographical records. BRAZIL (Maranhão).

Seasonal record. February.

Bionomic. Amazon Biome.

Remarks. These species fit best in the M. ferrugineus species-group as described by Rafael & Cumming (2009).

Macrostomus gurupi sp. nov. keys to Macrostomus flavus Rafael & Cumming or couplet 7 in the key of Macrostomus ferrugineus species-group presented by Rafael & Cumming (2009). In differs from the former in having the costal cell brown in the male (Fig. 65) (hyaline in M. flavus, (see Rafael & Cumming, 2009, fig. 6)); tergite 8 with distal projection distinctly curved in lateral view, slightly bilobated distally (Figs 66–67) (tergite 8 not so curved in lateral view, blunt distally (see Rafael & Cumming, 2009, fig. 6C)); epandrium with short and rounded posterodorsal lobe (Fig. 69) (epandrium with thin and acute posterodorsal lobe (see Rafael & Cumming, 2009, fig. 6C)); hypandrium without subdistal process distally (Figs 76–77) (hypandrium with keel-shaped subdistal process (see Rafael & Cumming, 2009, fig. 6E)).

Macrostomus gurupi sp. nov. was collected in Centro Novo do Maranhão (Februery).