Aztecatopse foliosa, Huerta, Herón & Haenni, Jean-Paul, 2016

Huerta, Herón & Haenni, Jean-Paul, 2016, New species of the genus Aztecatopse Haenni & Huerta from Mexico (Diptera, Scatopsidae), Zootaxa 4178 (1), pp. 79-96: 82-85

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Aztecatopse foliosa

sp. nov.

Aztecatopse foliosa  sp. nov.

( Figs 1View FIGURE 1 B, 3B, 4B, 6B, 7B, 9B, 10B, 11B, 13, 16)

Type material. HOLOTYPE: Male (slide mounting). Mexico, Estado de México, Otumba, Locality Coyotepec, 2530 m, 19º 39’ 09.3’’ N  ; 98º 45’ 25.7’’ W, 12.IV –4.V.2007, Malaise Trap, D. Hernández Zetina leg. (CAIM). Paratypes: 5 males, same data except 24.V –14.VI.2007  , 1 male (slide mounting); same data except 5–26.VI-2007  , 1 male (slide mounting), 1 male (in alcohol); same data except 15.XII –6.XII.2007  , 2 males (1 in alcohol, 1 slide mounted). All paratypes in CAIM, except 2 in MHNN.

Diagnosis. Tergite 7 bearing a pair of posterolateral, elongated projections; sternite 7, broad, extended laterally, bearing a pair of posterolateral, elongated projections; aedeagus leaf-like, with subapical tufts of setae.

Description. Male. Similar to A. amorimi  sp. nov. in most characters. Body length approximately 2.03 mm ( Fig. 1View FIGURE 1 B). Brownish species in general colour. Head. ( Fig. 1View FIGURE 1 B). Ommatidia equal in size, in lateral view at level of base of scape, a row of 6 ommatidia disposed from outer to inner ocular margin; scape square, a row of setae disposed along distal margin; pedicel subcylindrical, 8 flagellomeres ( Fig. 3View FIGURE 3 B) covered with microtrichia and sensilla; flagellomeres I –VII twice as wide as long, each bearing a whorl of setae, last flagellomere rounded, as long as 2 preceding ones, bearing 3 whorls of setae; flagellum length, 0.28 mm. Palpi ( Fig. 4View FIGURE 4 B) brown, setose, subcylindrical, apically rounded, with at least 4–5 subapical sensory pits, length 0.09 mm, width 0.045 mm.

Thorax. ( Fig. 1View FIGURE 1 B). A well-marked row of 10–11 supraalar setae; anterior spiracular sclerite setose (13–15 setae), with a well-marked antero-dorsal pointed projection, spiracle large, not longer than high ( Fig. 6View FIGURE 6 B); pleural setae: 9 anepisternal, in upper anterior corner of sclerite, 9–12 anepimeral, 6 subalar, 3–6 katepisternal, 3–4 posterior spiracular, no meral setae.

Wing. ( Fig. 7View FIGURE 7 B) length, 1.32–1.37 mm, width, 0.60–0.62 mm. R4+5 reaching costa beyond middle of wing, and slightly beyond level of fork of M; M fork nearly twice as long as stem, gradually widening towards wing margin; second costal section shorter than first; a false vein present between M2 and CuA1; CuA2 smoothly angled near middle, reaching wing margin obliquely. Wing length/section costal 1: 2.9; WL/C2: 5.3; WL/C3: 1.5; WL/C1+C2: 1.8; C extending 0.52 of wing length.

Abdomen. Tergite 7 wider than long, pilose, bearing a pair of posterolateral, elongated projections ( Figs 9View FIGURE 9 B, 10B); posterior margin V-shaped; length, 0.23 mm, width, 0.32 mm. Sternite 7 wider than long, slightly emarginate anteriorly, expanded laterally forming a cone-shaped lateral angle, a deep complex U-shaped posterior emargination ( Figs 9View FIGURE 9 B, 10B), presence of a small ornamented median zone, close to the posterior margin, with a group of small rough granulations; length, 0.20 mm, width, 0.41 mm. Genital capsule ( Figs 11View FIGURE 11 B, 13) short, epandrium with anterior margin deeply V-shaped, medially heavily sclerotized, without plough-like projection, posterior margin with a pair of small, setose, posterolateral lobes; gonocoxites joined to epandrium, with elongated, slender lateral processes; aedeagus leaf-like, bearing subapical tufts of setae, joined laterally to membranous process; parameres elongated, subcylindrical, with rounded, short subapical extension.

Female. Unknown.

Distribution. Nearctic. Mexico (Estado de Mexico) ( Fig. 16View FIGURE 16).

Bionomics. The six specimens of the type series were collected with a Malaise trap in an arid zone of central Mexico dominated by Agavaceae  and Cactaceae  during the months of April to June and November –December.

Etymology. The name refers to the leaf-like aedeagus, from Latin folium meaning “leaf”; the specific epithet is a noun in apposition.