Latheticomyia peruana, Marques, Dayse W. A. & Rafael, José A., 2016

Marques, Dayse W. A. & Rafael, José A., 2016, Latheticomyia Wheeler (Diptera: Pseudopomyzidae) from Peru: new species, description of the male of L. longiterebra Hennig and a key to species, Zootaxa 4093 (3), pp. 424-434 : 428

Latheticomyia peruana sp. nov.

Figures 14–31

Diagnosis. Scutum dark brown, except for a V-shaped yellow area, which does not reach transverse suture but extends to scutellum. Male sternite 6 bilobed. Cercus bifid. Distiphallus coiled once to a complete circle distally.

Description. Holotype male (figures from paratype). Body length 2.8 mm before drying (2.3 mm after dried). Head ( Figs 14, 15 ). Eyes subcircular. Ocellar triangle dark brown, with a pair of strong ocellar setae. Two pairs of small, thin, paravertical bristles and a row of postocular setulae. Frons ( Fig. 15 ) with many scattered setulae, plate mainly brown, light yellow on lateral margin, under orbital and vertical bristles and mesially in a subtriangular shape from base of antennae, tapering and ending before level of posterior orbital bristle. Face, parafacial, proboscis, palpus, and clypeus yellow. Gena yellow with uniseriated row of setae; one genal and one postgenal bristle stouter. Occiput yellow, with a very large brown spot reaching eye and foramen magnum. Antenna porrect; scape only brown dorsally, remaining yellow, small, with stout setulae; pedicel brown, inner face yellow, short, with complete ring of setulae apically; postpedicel mostly brown, large and somewhat subrectangular in shape; arista brown, inserted subapically, micropubescent. Thorax. Scutum ( Fig. 16 ) dark brown, except for a V-shaped yellow area, which does not reach transverse suture but extends to scutellum. Scutellum yellowish-white with dark brown stripes laterally. Mesopleuron ( Fig. 14 ) mainly dark brown except for large yellow-white stripe, beginning in postpronotal lobe and reaching metanepisternum; meron almost entirely dark brown spotted medially. Chaetotaxy: 1 stout and three small postpronotals; acrostichal setae irregular, becoming more numerous anteriorly; 5 dorsocentrals, with 1 presutural, and posterior bristle stouter; intra-alar bristles apparently in four somewhat irregular rows, becoming less numerous and larger posteriorly; 1 supra-alar presutural, 1 supra-alar postsutural; 2 postalar, anterior one largest; 3 pairs of scutellars, marginal, basal one shorter, apical one largest; 2 notopleurals; 1 proepisternal, katepisternum with setulae and 2 stouter bristles. Legs. ( Fig. 14 ). Slender, mainly with short seta and setulae. Coxae and trochanters brown. Fore and mid femora with basal half brown and distal half yellow; hind femur entirely brown. Fore and mid tibiae yellow; hind tibia brown with base yellow. Fore tarsomeres brown; mid and hind tarsomeres yellow. Wing. ( Fig. 17 ). Length 2.5 mm. Hyaline. Base of costal vein with 2 stout bristles before humeral weakening and 2 before subcostal break, the latter weaker. Halter yellowish, with whitish knob. Abdomen. ( Figs 14, 18–20 ). Tergites covered with black bristles; mainly brown with lateral and posterior margins yellow, tergite 1 somewhat yellow medially. Sternites 1 and 2 inconspicuous, unsclerotized; sternites 3–5 light yellow, small with a stouter preapical bristle; sternite 6 brown, large, bilobed, with longer bristles laterally, smaller ones on ventral surface and no bristles on anterior and posterior concavity ( Figs 19, 20 ). Terminalia (paratype). ( Figs 19–27 ). Syntergosternite 7+8 brown with a narrow yellow band posteriorly; distinctly shorter than epandrium, with a few sparsely scattered setulae. Epandrium ( Fig. 21 ) brown, elongate, covered with many black setulae. Surstylus ( Figs 21–24 ) elongated, simple. Cercus ( Figs 22, 23 ) setulose, strongly sclerotized, bifid. Subepandrial sclerite with a median projection on baciliform sclerite ( Fig. 24 ). Hypandrium large, somewhat straight, each arm distant from each other ( Figs. 25, 26 ). Phallapodeme rod-like ( Figs 25, 26 ). Phallus long and slender, distiphallus coiled once to a complete circle distally ( Fig. 25 ). Ejaculatory apodeme as in figure 27.

Variations (n = 10). Body length 2.7–3.2 mm (before drying). Wing length 2.4–2.6 mm. The specimens show small variation in size and shape of the postpedicel ( Figs 28–31 ), but the shape of the male terminalia are the same, so we considered all specimens conspecific.

Type Material. The holotype male is labeled: “PERU: Cusco, 19rd km W Quincemil, Rio Araza tributary, 13°20'10"S, 70°50'57"W, 874 m, 23–31.viii.2012, Malaise, R.R. Cavichioli, J.A. Rafael, A.P.M. Santos & D.M. Takiya [collectors]” “ Holotype ♂ Latheticomyia peruana ” ( MUSM). PARATYPES: same label as the holotype (34♂ MUSM, 35♂ INPA).

Holotype condition. Specimen previously stored in a tube with 70% ethanol, body a little bit wrinkled.

Etymology. The specific name refers to the country where the specimens were collected, Peru.

Distribution. Peru (Cusco).

Figures

FIGURES 14 – 31. Latheticomyia peruana sp. nov. Paratype male. 14, habitus, lateral view; 15, head, dorsal view; 16, thorax, dorsal view; 17, wing; 18, abdomen, dorsal view; 19, abdomen, lateral view; 20, abdomen, ventral view; 21, epandrium, cerci and surstyli, ventral view; 22, cerci and surstyli, ventral view; 23, cerci and surstyli, posterior view; 24, surstyli and subepandrial sclerite, dorsal view; 25, hypandrium, phallapodeme, phallus and ejaculatory apodeme, lateral view; 26, hypandrium and phallapodeme, ventral view; 27, ejaculatory apodeme; 28, antenna, lateral view (from holotype); 29 – 31, antenna, lateral view.