Latheticomyia longiterebra Hennig

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 : 425-426

Latheticomyia longiterebra Hennig

Figs 1–13

Latheticomyia longiterebra (Hennig 1969: 592, Figs 1, 2 ; Prado 1984: 48A.1; Buck & McAlpine 2010: 822, Fig. 5 ).

Diagnosis. Scutum with complete medial yellow stripe between dorsocentral rows interrupted along midline by a narrow dark brown line that does not reach base of scutellum. Male sternite 6 large and thin, basally concave, laterally convex. Cercus with a distinct subapical projection. Distiphallus coiled twice into a complete circle distally.

Description. Body length 2.6–3.2 mm (n= 10). Head. ( Figs 1, 2 ). 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. 2 ) with many scattered setulae, mainly brown, light yellow dorsally around eye, including along orbital plate with anterior region brown as it approaches parafacial, and anteromedially with elongate yellow triangle attaining ocellar tubercle. Face, parafacialia, proboscis, palpus, and clypeus yellow. Gena yellow with a row of eight genal setae; one genal and one postgenal bristle stouter. Occiput yellow, with a large brown spot extending from eye to foramen magnum. Antenna porrect, mostly brown, but yellow on ventral basal margin; scape small, with stout setulae; pedicel short, inner surface yellow, with complete ring of setulae apically; postpedicel very large and subrectangular in shape; arista brown, inserted subapically, micropubescent. Thorax. Scutum ( Fig. 3 ) with complete medial yellow stripe between dorsocentral rows interrupted along midline by a narrow dark brown line that does not reach base of scutellum; with broad dark brown stripes laterally, which have a narrowly yellow stripes medially from behind transverse suture to base of scutellum. Scutellum small and flat, whitish with dark brown stripes laterally, both continuous with scutum stripes. Mesopleuron ( Fig. 1 ) light yellow except for a dark brown stripe beginning anterior to postpronotal lobe and reaching katepisternum; meron dark brown spotted medially. Chaetotaxy: 1 postpronotal; acrostichals biseriated, being one complete row over brown stripe, with last bristle stouter, and one incomplete row over yellow stripe, ending around middle distance between transverse suture and base of scutellum; 5 dorsocentrals, being 1 presutural and with posterior bristle stouter; intra-alar postsutural small in two somewhat irregular rows; 1 supra-alar presutural, 1 supra-alar postsutural; 2 postalars; 3 pairs of scutellars, marginal, basal pair shorter, apical pair reclinate; 2 notopleurals; 1 proepisternal; katepisternum with setulae and 2 stouter bristles. Legs. ( Fig. 1 ). Slender, mainly with short seta and setulae. Fore coxa and trochanter whitish, mid and hind coxae and trochanters yellow. Fore femur brown with yellow apex; mid and hind femora with basal half brown, distal half yellow; hind femur with small brown dorsal spot subapically. Fore and mid tibiae yellow; hind tibia yellow, with brown spots medially and apically. Tarsi yellow to light brown. Wing. ( Fig. 4 ). Length 2.3–2.6 mm (n= 10). Clear, slightly light brown on costal margin. Base of costal vein with 2 stout bristles before humeral weakening and 2 before subcostal break, the latter weaker. Halter yellowish. Abdomen. ( Figs 1, 5–7 ). Tergites covered with black bristles; mainly brown with lateral and posterior margins yellow, furthermore, tergites 1 and 2 somewhat yellow medially. Sternites 1 and 2 inconspicuous, unsclerotized; sternites 3–5 light brown, small with a stouter bristle distally; sternite 6 brown, larger than anterior ones, more sclerotized along basal and lateral margins, basally concave without bristles, laterally convex with long bristles, being one subapical bristle stouter, ventral surface unsclerotized and without bristles ( Figs 6, 7 ). Terminalia. ( Figs 6–13 ). Syntergosternite 7+8 brown dorsally, yellow laterally, distinctly shorter than epandrium, with a few setulae sparsely scattered. Epandrium ( Fig. 8 ) brown, elongate, covered with many black bristles. Surstylus ( Figs 8–10 ) convergent distally, elongated, with distinctly external bristles at distal third and a internal pair of shorter spine-like bristle. Cercus ( Figs 8, 9 ) more sclerotized, with a distinct subapical projection. Subepandrial sclerite ( Fig. 10 ) subtriangular with a more sclerotized area, which is T-shaped. Hypandrium elongated, sinuose, each arm approximated to each other basally ( Figs 11, 12 ). Phallapodeme rod-like ( Figs 11, 12 ). Phallus very long and slender, distiphallus coiled twice into a complete circle distally ( Fig. 11 ). Ejaculatory apodeme ( Fig. 13 ) somewhat inconspicuous and with an irregular shape.

Examined Material. “ PERU: Cusco, Quincemil, 13°13'03.4"S, 70°43'40"W, 633 m, 23–31.viii.2012, Sweep, J.A. Rafael , R.R. Cavichioli & D.M. Takiya [collectors]” (1♂, INPA) ; idem, 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]” (18♂ MUSM, 18♂ INPA) .

Distribution. Peru.

Remarks. The male specimens fits Hennig’s (1969) description and as they were collected around 50 km far away the type locality (Avispas, Madre de Dios) of L. longiterebra , they are being considered conspecific. According to Hennig (1969), L. longiterebra differs from other species known by “the unusual length of the female ovipositor (the 7th abdominal segment): this is nearly as long as the entire rest of the abdomen, while their length does not exceed the 5th and 6th abdominal length in other species”. Only male specimens were collected using Malaise traps.

Figures

FIGURES 1 – 13. Latheticomyia longiterebra. Male. 1, habitus, lateral view; 2, head, dorsal view; 3, thorax, dorsal view; 4, wing; 5, abdomen, dorsal view; 6, abdomen, lateral view; 7, abdomen, ventral view; 8, epandrium, cerci and surstyli, ventral view; 9, cerci and surstyli, ventral view; 10, surstyli and subepandrial sclerite, dorsal view; 11, hypandrium, phallapodeme and phallus, lateral view; 12, phallapodeme and hypandrium, ventral view; 13, ejaculatory apodeme.