Dasyhelea dellapei Díaz and Spinelli, 2010
Díaz, Florentina, Spinelli, Gustavo R. & Ronderos, María M., 2010, A revision of the species allied to Dasyhelea patagonica Ingram and Macfie (Diptera: Ceratopogonidae), Journal of Natural History 44 (45 - 46), pp. 2825-2849 : 2828-2831
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|Dasyhelea dellapei Díaz and Spinelli|
The only species of the patagonica group in which the posteromedian margin of the sternite 9 is broadly rounded, not excavated or with distal process or projections. The female subgenital plate is subtriangular, the posterolateral arms are slender, and their inner margins are concave with pointed, mesally directed tips. Both sexes with the largest number (approximately 50) of scutellar setae.
Male. Similar to female with usual sexual differences. Flagellum as in Figure 1A View Figure 1 . Palpus ( Figure 1B View Figure 1 ) with third segment bearing scattered sensilla; PR 4.94 (4.50–5.13, n = 4). Scutellum with 28–30 long setae and 22–28 shorter ones. Wing ( Figure 1C View Figure 1 ) length 1.91 mm (1.82–1.98 mm, n = 4), width 0.54 mm (0.48–0.58 mm, n = 4), CR 0.52 (0.51–0.54, n = 4). Genitalia ( Figure 1D View Figure 1 ): tergite 9 tapering distally, extending to level of apex of gonocoxite, apicolateral process slender, with apical seta; cercus with two or three setae; sternite 9 ( Figure 1E View Figure 1 ) 0.45 times longer than greatest width, posteromedian margin broadly rounded (folded in the available specimens). Gonocoxite stout, 1.8 times longer than greatest width; gonostylus as long as gonocoxite, narrow base, nearly straight, two basal setae, blunt apex. Parameres ( Figure 1F View Figure 1 ) with basal arms slender, curved; posteromedian projection triangular, extending shortly beyond basal arch of aedeagus, tip pointed. Aedeagus well sclerotized with rounded tip; 0.65 times longer than greatest width, basal arch extending to 0.55 of total length; basal arms stout, slender, directed anterolaterad; posterolateral arms short, recurved laterad.
Female. Head dark brown. Eyes contiguous by width of one ommatidia. Antenna with flagellum ( Figure 1G View Figure 1 ) dark brown; AR 0.96 (0.91–1.09, n = 6). Clypeus ( Figure 1H View Figure 1 ) with 12–17 setae. Palpus ( Figure 1I View Figure 1 ) dark brown; third segment with four sub-basal capitate sensillae; PR 4.49 (4.17–4.86, n = 6).
Thorax. Scutum dark brown, scutellum with 25–30 long setae and 22–26 shorter ones. Legs dark brown, including tarsi; hind tibial comb with four spines; prothoracic TR 1.95 (1.70–2.15, n = 6), mesothoracic TR 1.95 (1.78–2.12, n = 6), metathoracic TR 1.71 (1.57–1.89, n = 6). Wing ( Figure 1J View Figure 1 ), length 1.84 mm (1.76–1.92 mm, n = 5), width 0.72 mm (0.68–0.76 mm, n = 5), CR 0.53 (0.52–0.56, n = 5); membrane slightly infuscated, densely covered with macrotrichiae; second radial cell open; cubital fork at same level of anterior portion of second radial cell. Halter dark brown.
Abdomen. Dark brown. Subgenital plate ( Figure 1K View Figure 1 ) subtriangular; posterolateral arms slender, inner margin concave with pointed, mesally directed tip. Two ovoid spermathecae ( Figure 1L View Figure 1 ), subequal, with straight necks, measuring 0.056 by 0.054 mm and 0.052 by 0.046 mm, necks 0.006 mm.
Argentina (Santa Cruz).
Holotype male, Argentina, Santa Cruz prov., Lago del Desierto , 9 December 1996, G. Spinelli, red . Paratypes 3 males, 6 females, as follows: same data as holotype 1 male, 5 females (1 male, 4 female in MLP; 1 female in NHM); Parque Nacional Perito Moreno, Lago Burmeister, 24 November 1999, G. Spinelli - P. Marino , 2 males, 1 female, red (1 male, 1 female in MLP, 1 male in NHM) .
This species is named after Dr Pablo M. Dellapé, entomologist of the Museo de La Plata.
This very dark brown species is the largest within the patagonica group, and can be easily distinguished from the other species by the numerous scutellar setae. The male genitalia are similar to those of D. patagonica , but in the latter species the aedeagus is distinctly broader and its distal portion is not rounded.
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