A revision of the species allied to Dasyhelea patagonica Ingram and Macfie (Diptera: Ceratopogonidae) Author Díaz, Florentina Author Spinelli, Gustavo R. Author Ronderos, María M. text Journal of Natural History 2010 2010-11-05 44 45 - 46 2825 2849 http://dx.doi.org/10.1080/00222933.2010.512424 journal article 10.1080/00222933.2010.512424 1464-5262 5212142 Dasyhelea fueguina Díaz and Spinelli sp. nov. ( Figures 2 , 3 ) Diagnosis The only species of the patagonica group with the posteromedian projection of parameres bearing a stout, distally directed process with broad, bifid tip, and the spermathecae with hyaline necks. Male. Similar to female with usual sexual differences. Flagellum as in Figure 3A . Palpus ( Figure 3B ) with third segment bearing scattered sensilla; PR 4.06 (3.64–4.28, n = 3). Scutellum with 19–22 long setae and eight shorter ones. Wing ( Figure 3C ) length 1.50 mm ( 1.42–1.54 mm , n = 3), width 0.43 mm ( 0.42–0.44 mm , n = 3), anal lobe narrow, CR 0.53 (0.52–0.54, n = 3). Genitalia ( Figure 3D ): tergite 9 tapering distally, extending nearly to level of apex of gonocoxite, apicolateral process slender, with apical seta; cercus with two or three setae; sternite 9 ( Figure 3E ) 0.45 times longer than greatest width, posteromedian margin folded, slightly excavated. Gonocoxite stout, 1.8 times longer than greatest width, with elongate, blunt anteromedian process; gonostylus slender, as long as gonocoxite, narrow base, nearly straight, tip pointed. Parameres ( Figure 3F ) with basal arms stout, the fusion to posteromedian projection slightly sclerotized; posteromedian projection short, well sclerotized anteriorly, bearing a stout, distally directed process with broad, bifid tip. Aedeagus stout, well sclerotized, 0.7 times longer than greatest width, basal arch extending to 0.5 of total length, with rounded tip; basal arms short, recurved; posterolateral arms short, divergent, tips recurved mesad. Female. Head dark brown. Eyes contiguous by width of one or two ommatidia. Antenna with flagellum ( Figure 3G ) dark brown; AR 1.05 (0.95–1.13, n = 5). Clypeus ( Figure 3H ) with 8–10 setae. Palpus ( Figure 3I ) dark brown; third segment with three or four sub-basal capitate sensillae; PR 3.70 (3.07–4.07, n = 5). Thorax. Scutum dark brown, scutellum with 16–21 long setae and 8–12 shorter ones. Legs dark brown, including tarsi; hind tibial comb with four spines; prothoracic TR 2.14 (1.66–2.71, n = 5), mesothoracic TR 2.01 (1.71–2.28, n = 5), metathoracic TR 1.87 (1.71–2.00, n = 5). Wing ( Figure 3J ), length 1.35 mm ( 1.10–1.52 mm , n = 5), width 0.48 mm ( 0.44–0.52 mm , n = 5), CR 0.53 (0.52–0.55, n = 5); membrane slightly infuscated, densely covered with macrotrichiae; second radial cell open; cubital fork at same level of distal portion of first radial cell. Halter dark brown. Abdomen. Dark brown. Subgenital plate ( Figure 3K ) subtriangular, anterior margin somewhat rounded, irregular; posterolateral arms slender, inner margin concave with pointed, mesally directed tip. Two ovoid spermathecae ( Figure 3L ), unequal, with straight, hyaline necks, measuring 0.070 by 0.046 mm and 0.058 by 0.042 mm , necks 0.006 mm . Distribution Argentina , only known from its type locality . Figure 3. Dasyhelea fueguina Díaz and Spinelli sp. nov. : (A–F) male, (G–L) female. (A) Flagellum. (B) Left palpus. (C) Wing. (D) Genitalia (ventral view). (E) Sternite 9. (F) Parameres. (G) Flagellum. (H) Clypeus. (I) Left palpus. (J) Wing. (K) Subgenital plate. (L) Spermathecae. Scale bars 0.05 mm. Type material Holotype male, Argentina , Tierra del Fuego , Parque Nacional Tierra del Fuego , río Ovando y ruta nacional no. 3, 54 ◦ 50 ′ 45.3 ′′ S , 68 ◦ 34 ′ 47.7 ′′ W , 1 December 2008 , G. Spinelli , red . Paratypes 2 males , 5 females , same data ( 1 male , 4 females in MLP; 1 male , 1 female in NHM ) . Etymology The specific epithet refers to the province of Tierra del Fuego , where the type series was collected . Discussion The aedeagus of D . fueguina is very similar to the one of D . dellapei , especially by its rounded tip. However, the species can be easily distinguished by the parameres bearing a stout process with broad, bifid tip.