Aztecatopse amorimi, 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: 80-82

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Aztecatopse amorimi

sp. nov.

Aztecatopse amorimi  sp. nov.

( Figs 1View FIGURE 1 A, 2, 3A, 4A, 5, 6A, 7A, 8, 9A, 10A, 11A, 12, 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: 56 males, same data except 12.IV –4GoogleMaps  . V.2007, 18 males (in alcohol), 3 males (slide mounting); same data except 24.V –14GoogleMaps  . VI.2007, 13 males (in alcohol); same data except 5–26GoogleMaps  . VI.2007, 10 males (in alcohol); same data except 24-VIII-14GoogleMaps  - IX.2007, 3 males (slide mounting); same data except 4–31GoogleMaps  - X.2007, 4 males (in alcohol), 1 male (slide mounting); same data except 15.XI –6GoogleMaps  . XII.2007, 1 male (in alcohol); same data except 23.I –13GoogleMaps  . II.2008, 3 males (in alcohol). All paratypes in CAIM, except 5 in MHNN.

Diagnosis. Tergite 7 triangular, bearing a pair of short posterolateral projections; sternite 7 broad, extended laterally, bearing a pair of posterolateral, pointed projections; parameres elongate, with spatulate subapical expansion.

Description. Male. Body length approximately 2.0 mm ( Fig. 1View FIGURE 1 A). Brownish species in general colour. Head. ( Fig. 2View FIGURE 2) Shining black, longer than wide; eyes large, holoptic, with short hairs between facets; ommatidia equal in size, in lateral view at level of base of scape, a row of 7 ommatidia disposed from outer to inner ocular margin; three ocelli, equal in size; antennae ( Fig. 2View FIGURE 2, 3View FIGURE 3 A) uniformly brown, longer than head-height; scape square, a row of setae disposed along to distal margin; pedicel subcylindrical, 8 flagellomeres 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, 0.25 mm; frontoclypeus setose; occiput pilose, with a pair of lateral sensilla; small internal sclerotized sclerite at base of labella, as long as palpus; palpi ( Fig. 2View FIGURE 2, 4View FIGURE 4 A) brown, setose, subcylindrical, apically rounded, with at least 3–4 subapical sensory pits, length 0.09 mm; labella shorter than palpi; cardo-stipes setose.

Thorax. ( Fig. 1View FIGURE 1 A, 5) Dark brown; mesonotum narrow, much longer than wide, covered with dense short pilosity, a well-marked row of 10–12 supraalar setae, scutellum with a row of 12–14 elongate marginal setae; anterior spiracular sclerite setose (9–12 setae), with a well-marked antero-dorsal pointed projection, spiracle large, not longer than high ( Fig. 6View FIGURE 6 A); pleural setae: 9–13 anepisternal, in upper anterior corner of sclerite, 5–8 anepimeral, 6–9 subalar, 3–4 katepisternal, 4–5 posterior spiracular, no meral setae.

Wing. ( Fig. 7View FIGURE 7 A) length, 1.27–1.32 mm, width, 0.57–0.62 mm; membrane with dense microtrichia; no macrotrichia on membrane except the usual row along the posterior margin; R1 and R4+5 with an irregularly arranged row of short setae dorsally; 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: 2.8; WL/C2: 7.2; WL/C3: 1.9; WL/C1+C2: 2.04; C extending 0.51 of wing length. Halters brown, bearing a row of 3–4 setae on stem.

Legs. ( Fig. 8View FIGURE 8) Concolourous with body, tarsi somewhat lighter, especially the posterior ones; comb of setae on posteroapical part of hind tibia well developed; first tarsomere of posterior leg longer than second.

Abdomen. Tergites and sternites shining. Tergites with pilosity much reduced on anterior segments, becoming denser on posterior segments. Tergite 2 with well defined sublateral lunula-like pretergites. Sternite 1 unsclerotized, 2 to seven normally sclerotized, regularly beset with pilosity and micropilosity; segment 7 with a narrow anterior ring of sclerotization joining tergite and sternite; tergite 7 triangular, short, pilose, bearing a pair of posterolateral, short projections ( Figs 9View FIGURE 9 A, 10A), heavier sclerotized than rest of segment; posterior margin rounded; length, 0.15 mm, width, 0.32 mm. Sternite 7 wider than long, slightly emarginate anteriorly, expanded laterally, bearing a pair of posterolateral, pointed projections; posterior emargination of the sternite complex, deeply V-shaped ( Figs 9View FIGURE 9 A, 10A); median zone of sternite 7 close to posterior margin ornamented, bearing a cluster of small rounded granulations; length, 0.25 mm, width, 0.37 mm. Genital capsule ( Figs 11View FIGURE 11 A, 12) elongate, epandrium triangular, posterior margin prolonged into a sclerotized plough-like process; gonocoxites joined to epandrium, medial lobe setose, a pair of straight, flattened processes; aedeagus long and thick, pilose apically; parameres elongate, bearing a ventromedian, short spine, with a spatulate subapical expansion; sperm-duct elongate, enlarged, with comparatively small vesica.

Female. Unknown.

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

Bionomics. All specimens of the type series were collected with a Malaise trap in an arid zone dominated by Agavaceae  and Cactaceae  . The higher number of specimens was collected during the months of April and May. Etymology. The species is named after our friend and colleague Dr. Dalton de Souza Amorim, for his outstanding contribution to the systematics and phylogeny of the Scatopsidae  of the world.


Collection of Aquatic Important Microorganisms