Dasyhelea fueguina 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 : 2832-2834

publication ID

https://doi.org/ 10.1080/00222933.2010.512424

persistent identifier


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scientific name

Dasyhelea fueguina Díaz and Spinelli

sp. nov.

Dasyhelea fueguina Díaz and Spinelli sp. nov.

( Figures 2 View Figure 2 , 3 View Figure 3 )


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 View Figure 3 . Palpus ( Figure 3B View Figure 3 ) 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 View Figure 3 ) 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 View Figure 3 ): 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 View Figure 3 ) 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 View Figure 3 ) 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 View Figure 3 ) dark brown; AR 1.05 (0.95–1.13, n = 5). Clypeus ( Figure 3H View Figure 3 ) with 8–10 setae. Palpus ( Figure 3I View Figure 3 ) 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 View Figure 3 ), 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 View Figure 3 ) subtriangular, anterior margin somewhat rounded, irregular; posterolateral arms slender, inner margin concave with pointed, mesally directed tip. Two ovoid spermathecae ( Figure 3L View Figure 3 ), unequal, with straight, hyaline necks, measuring 0.070 by 0.046 mm and 0.058 by 0.042 mm, necks 0.006 mm.


Argentina, only known from its type locality .

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 GoogleMaps . Paratypes 2 males, 5 females, same data (1 male, 4 females in MLP; 1 male, 1 female in NHM) GoogleMaps .


The specific epithet refers to the province of Tierra del Fuego, where the type series was collected .


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.


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