Macrostomus trombetensis, Rafael, José Albertino & Cumming, Jeffrey M., 2015

Rafael, José Albertino & Cumming, Jeffrey M., 2015, Revision of the genus Macrostomus Wiedemann (Diptera, Empididae, Empidinae). IV. The amazonensis species-group, Zootaxa 3947 (1), pp. 109-121 : 116-117

Macrostomus trombetensis sp. nov.

( Figs 39–44 )

Diagnosis. Thorax black except prosternum and part of propleuron yellow. Abdomen including terminalia black with tergite 1 slightly yellow laterally. Male tergite 8 short, without sinus anteriorly and with shallow sinus posteriorly. Epandrium with posterodorsal lobe of epandrium higher than anterodorsal lobe. Anterior cercus with thin process at posterior margin; posterior cercus vertically elongate with one small secondary protuberance. Hypandrium with two uniseriate setae and shallow sinus on posterior margin. Female hind tibia without pinnate setae.

Description. Holotype male. Body not measured (due to detached head); wing length 2.6 mm. Width of frons approximately subequal to anterior ocellus width. Antenna velvety black. Palpus brown. Thorax shiny black with prosternum and part of propleura yellowish. Thoracic setae: 4 dorsocentrals, 4 antepronotals, 2 proepisternals, 2 pairs of scutellars. Legs shiny yellow with apex of hind femur, almost entire hind tibia and all tarsomeres 3–5 black. Hind femur lacking anteroventral setae at distal third. Wing (as in Fig. 56 of M. albicaudatus ). Halter light brown, partially white at knob. Abdomen shiny black with tergite 1 slightly yellow laterally. Terminalia similar to M. albicaudatus nov. sp. ( Figs 11–14 ), except anterior cercus ( Fig. 40 ) narrower in dorsal view, cercal bridge ( Fig. 40 ) larger, hypandrium with 2 uniseriated setae and sinuosity less pronounced ( Fig. 41 ).

Female. Thorax with 3–4 dorsocentrals setae. Hind tibia without pinnate setae. Wing (as in Fig. 57 of M. albicaudatus ). Terminalia very similar to M. albicaudatus nov. sp. ( Figs 15–17 ), except sternite 8 ( Figs 42, 43 ) with distal lateral projections more acuminate (as seen ventrally) and genital fork ( Fig. 44 ) with genital chamber much more elongated.

Geographical distribution. Brazil (Pará).

Type material. HOLOTYPE ♂: “ BRASIL, Pará, Rio Trombetas, Cruz Alta”; “ 25–28.vii.1992, varredura, João Vidal”; “ Macrostomus trombetensis Holótipo ♂” (red label) ( INPA). PARATYPES. BRAZIL. Same data as holotype (2♀ INPA); Rio Mapuera, Cachoeira, Assunção, Malaise, 5–17.vi.1986, Eq. V. Py-Daniel (1♀ INPA).

Holotype condition. Pinned, head and terminalia in glycerin. Left hind leg lost.

Etymology. Named according to the Trombetas River region where the specimens were collected.

Discussion. See under M. albicaudatus sp. nov.

Figures

FIGURES 39 – 44. Macrostomus trombetensis, sp. nov. 39 – 41, holotype ♂. 39, epandrium (gray colored); 40, cercal bridge connecting anterior cerci, anterodorsal view, setae ommited; 41, hypandrium and apex of phallus, lateral view; 42 – 44, paratype ♀, setae omitted; 42, tergite 8 and sternite 8, lateral view; 43, sternite 8, ventral view; 44, genital fork, ventral view. Abbreviations: AC, anterior cercus. Scales: 39 – 41, 42 – 43 = 0.2 mm; 44 = 0.1 mm.

FIGURES 54 – 63. Wings. 54, Macrostomus acreanus sp. nov. paratype ♂; 55, M. acreanus sp. nov. paratype ♀; 56, M. albicaudatus sp. nov. paratype ♂; 57, M. albicaudatus sp. nov. paratype ♀; 58, M. amazonensis sp. nov. paratype ♂; 59, M. amazonensis sp. nov. paratype ♀; 60, M. paraiba sp. nov. paratype ♂; 61, M. paraiba sp. nov. paratype ♀; 62, M. xavieri sp. nov. paratype ♂; 63, M. xavieri sp. nov. paratype ♀.

FIGURES 10 – 17. Macrostomus albicaudatus, sp. nov. 10 – 14, paratype ♂. 10, hindleg (femur, tibia and tarsomere 1); 11, tergite 8, dorsal view, right setae omitted; 12, terminalia, lateral view (epandrium and cercal lobes gray colored, tergite 8 setae omitted); 13, cercal bridge connecting anterior cerci, anterodorsal view, setae omitted; 14, hypandrium and phallus, lateral view; 15 – 17, paratype ♀. 15, tergite 1 to cerci, dorsal view, setae omitted; 16, sternite 1 to sternite 8, ventral view, left setae omitted, sternite 8 detached, lateral view; 17, genital fork, ventral view. Abbreviations: AC, anterior cercus; St, sternite; T, tergite; VPC, ventral projection of cercus. Scales: 10, 15 - 16 = 0.5 mm; 11 – 14 = 0.2 mm; 17 = 0.1 mm.