Gauromydas mateus
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Ordo: Diptera
Familia: Mydidae
Genus: Gauromydas
Name
Gauromydas mateus Calhau, Lamas & Nihei – Wikispecies link – Pensoft Profile
- Gauromydas mateus Calhau, Julia, 2015, Zootaxa 4048: 402-403.
Diagnosis
Diagnosis. Scutum velvety-black with discrete gray pruinescence, more distinct on acrostichal stripes. Male hind femur about 2 times wider than hind tibia. Hind tibia with well-developed ventral keel and apical spur. Hind tarsomere 1 about 2.8 times longer than wide, and 1.6 times longer than tarsomere 5. Wing membrane light brown, transparent, without opaque areas (at most with semi-transparent regions at base and on posterior margin); alula higher than wide. Abdominal T 2–5 partially orange, or all brown. Male epandrial lamellae triangular with posterior extremity prolonged as a distinct spine; phallic crest thick, membranous, strongly sclerotized anteriorly, lateral projections reduced. Anterior margin of female S 8 concave; furca well sclerotized; female S 10 sclerotized medially; sclerite at base of spermathecal ducts wider than cercus.
Description
Description. Male. Total length of holotype, excluding antennae, 29 mm (Fig. 2 A). Head (Fig. 2 B): Black, setulae dark brown to black, pruinescence gray; 4.3 mm high in lateral view, 6.15 mm wide in anterior view (holotype). Facial gibbosity dark brown, higher than wide; mystax dense, medially brown, laterally white. Mouthparts: proboscis black. Antennae: scape and pedicel black, setulae all black. Measures in holotype: scape 0.75 mm long; pedicel 0.23 mm long. Thorax (Fig. 2 A): dark brown. Setulae of scutum black, distributed anteriorly on dorsocentral area, lateral margins, postalar callus and posteriorly close to scutellum; pruinescence discrete, gray, denser on acrostichal stripes. Pleuron scarcely gray pruinose. Anepisternum black setulose on dorsal margin. Anepimeron, metepimeron, metakatepisternum, prosternum, proepisternum, mesosternum and scutellum, long black setulose. Male paratype with cuticular projection on prothoracic spiracle margin (Fig. 2 F). Legs (Fig. 2 C): dark brown; setulae mostly short, black. Hind femur 10.54 mm long, 1.78 mm wide (holotype), with 15–17 black spiniform macrosetae (17 in holotype), distributed into anteroventral and anterodorsal rows and scarce long erect dorsal and posteroventral setulae. Fore and mid tibiae densely setulose; hind tibia 7.94 mm long, 0.89 mm wide (holotype), ventral keel developed, apical spur 0.85 mm long (holotype) with strong anteroventral setulae at base of spine. Measures of hind tarsus in holotype: tarsomere 1 1.64 mm long, 0.59 mm wide; tarsomere 2 0.92 mm long; tarsomere 3 0.92 mm long; tarsomere 4 0.52 mm long; tarsomere 5 1.05 mm long. Pulvillus pale brown, shorter than fore, mid and hind tarsomeres 5; claws reddish brown, tip black. Wing (Fig. 2 E): 24.93 mm long, 8.35 mm wide; alula 2.5 mm long, 2.94 mm wide (holotype). Membrane light brown; transparent, without opaque areas, at most with semi-transparent regions at base and on posterior margin; microtrichia absent. Veins orange to brown; C with short black setulae on anterior wing margin and very short brown microtrichia on posterior wing margin; Sc ending in C slightly distal to fork of R 4 + 5; R 3 (‘stump vein’) emerging from R 4, a little after base; cell r 4 closed (R 5 terminating in R 1); CuA 1 +M 3 present. Upper calypter dark brown, broader distally; marginal squamous setulae dark brown. Halter dark brown. Abdomen (Fig. 2 C): T 2–5 mostly orange, laterally dark brown, remaining tergites and sternites dark brown (holotype) or all brown with discrete metallic tergites. Anterior portion of T 1 cone shaped, pointed, with few black setulae close to base of halter; posterior portion long black setulose. T 2 –T 7 and S 2 –S 7 short black setulose, very scarcely pruinose, shinny. Bulla black, about 6 times as long as wide. Male terminalia (Figs 4 A–C): epandrial lamella triangular with posterior extremity prolonged as distinct spine. Phallus with thick membranous dorsal structure (phallic crest), strongly sclerotized anteriorly; lateral projections reduced. Female. Total length, excluding antennae, 38.2 mm (Fig. 2 E). Very similar to male holotype in color and chaetotaxy, but distinctly more robust and larger than male. T 6–7 with violet metallic reflection. Female terminalia (Figs 5 A–C): anterior margin of S 8 concave; S 10 sclerotized medially; furca well sclerotized; sclerite at base of spermathecal ducts wider than cercus.
Etymology
Etymology. The specific epithet is a patronym with noun in apposition, honoring Mateus I. C. Kawada, son of the first author.
Discussion
Remarks. This is the only Gauromydas species with orange coloration on abdominal tergites. Despite the male paratype differing from the holotype in coloration and the cuticular projection on spiracular margin, these differences are here considered intraspecific variation, as they have identical terminalia.
Materials Examined
Type material. HOLOTYPE ♂. ARGENTINA. Santiago del Estero, 1936, E.R. Wagner col. (MNHN). PARATYPES. ARGENTINA. Salta: Rio Pescado, ca. Urán, 22.53 S, 64.27 W, C. Potter col. (1 ♂, MZUSP); no data (1 ♀, MZUSP).
Taxon Treatment
- Calhau, Julia; Lamas, Carlos José Einicker; Nihei, Silvio Shigueo; 2015: Review of the Gauromydas giant flies (Insecta, Diptera, Mydidae), with descriptions of two new species from Central and South America, Zootaxa 4048: 402-403. doi
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