Dasyhelea shannoni Ingram and Macfie, 1931

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 : 2845-2848

Dasyhelea shannoni Ingram and Macfie, 1931

( Figures 7 , 9 )

Dasyhelea shannoni Ingram and Macfie, 1931: 183 (male, female, Chile); Wirth, 1974: 18 (in catalogue of south USA species); Borkent and Wirth, 1997: 57 (in World catalogue); Borkent and Spinelli, 2000: 26 (in catalogue of south USA species); Borkent and Spinelli, 2007: 61 (in Neotropical catalogue); Borkent, 2009: 70 (online catalogue).

Diagnosis

The only species of the patagonica group with arrow-shaped posteromedian of male sternite 9, and female subgenital plate triangular and very high.

Male. Similar to female with usual sexual differences. Flagellum as in Figure 9A . Palpus ( Figure 9B ) with third segment bearing scattered sensilla; PR 4.36 (4.00–5.00, n = 10). Scutellum with 14–19 long setae and 10–14 shorter ones. Wing ( Figure 9C ); length 1.26 mm (1.20–1.32 mm, n = 7), width 0.39 mm (0.36–0.42 mm, n = 7), CR 0.49 (0.48–0.50, n = 7). Genitalia ( Figure 9D ): tergite 9 rounded distally, not reaching level of apex of gonocoxite, apicolateral process slender, with apical seta; cercus with four or five setae; sternite 9 ( Figure 9E ) 0.5 times longer than greatest width, with posteromedian margin arrow-shaped, reaching aedeagus apex. Gonocoxite stout, 1.5 times longer than greatest width; gonostylus 0.8 longer than gonocoxite, width base, nearly straight, tapering to pointed apex. Parameres ( Figure 9F ) with basal arms slightly curved; posteromedian projection triangular, short, reaching aedeagus midlength. Aedeagus very sclerotized, 0.6 times longer than greatest width, basal arch extending to 0.3 of total length; basal arms elongate, directed laterad; posterolateral arms convergent, slender, apex recurved directed ventrad.

Female. Head dark brown. Eyes contiguous by width of one or two ommatidia. Antenna with flagellum ( Figure 9G ) pale; AR antennal 1.01 (0.84–1.07, n = 10). Clypeus ( Figure 9H ) with 9–13 setae. Palpus ( Figure 9I ) brown; third segment with three sub-basal capitate sensillae; PR 3.91 (3.50–4.45, n = 10).

Thorax. Scutum dark brown, scutellum with 16–19 long setae and 10–18 shorter ones. Legs dark brown; hind tibial comb with five spines; prothoracic TR 1.85 (1.72– 2.00, n = 10), mesothoracic TR 1.88 (1.71–2.22, n = 10), metathoracic TR 1.76 (1.44–1.95, n = 10). Wing ( Figure 9J ), length 1.23 mm (1.10–1.38 mm, n = 10), width 0.50 mm (0.44–0.58 mm, n = 10), CR 0.50(0.49–0.52, n = 10); membrane slightly infuscated, densely covered with macrotrichiae; cubital fork at same level of middle length of second radial cell. Halter dark brown.

Abdomen. Dark brown. Subgenital plate ( Figure 9K ) stout, triangular, extending to anterior margin of eighth segment; posterolateral arms short, slender. Two pyriform spermathecae ( Figure 9L ), subequal, with slender, straight necks, measuring 0.042 by 0.032 mm and 0.036 by 0.030 mm, necks 0.004 mm.

Distribution

Argentina (Neuquen, Santa Cruz); Chile (Arauco, Cautin, Chiloé, Coihaique, Llanquihue, Malleco, Valdivia).

Type material

Holotype male, Chile, Llanquihue prov. , Ensenada, 14 / 15 December 1926, F. and M. Edwards; allotype female, Chile, Chiloe Islands, Ancud, 17–19 December 1926, F. and M. Edwards ( NHM, examined).

Other specimens examined

Argentina: Neuquen prov., 20 km north of lago Aluminé , 13 February 1994, G. Spinelli, 1 male ( MLP) ; Hua-Hum , 11 February 1989, G. Spinelli, 1 male, red ( MLP) ; 6–7 km south of San Martín de los Andes , 900 m, 26 November 1984, G. Spinelli, 1 female ( MLP) ; Parque Nacional Nahuel Huapi, río Pichitraful , 40 ◦ 42 ′ 46 ′′ S, 71 ◦ 47 ′ 23 ′′ W, 789 m, 4–23 February 2008, A. Garre – F. Montes de Oca, 1 male, Malaise trap ( MLP) . Río Negro prov., Parque Nacional Nahuel Huapi, río Manso superior, 41 ◦ 14 ′ 8.1 ′′ S, 71 ◦ 46 ′ 58.5 ′′ W, 845 m, 7 February to 2 March 2007, A. Garré – F. Montes de Oca, 3 males, 1 female, Malaise trap ( MLP) . Santa Cruz prov., lago del Desierto , 19 January 1995, I. Garda, 1 male, 1 female, red ( MLP) , same data except 9 December 1996, G. Spinelli, 1 male ( MLP) . Tierra del Fuego prov., 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, 4 males, red ( MLP) .

Chile: Arauco prov., Pata de Gallina, 7 December 2003, G. Spinelli, 2 males, red. Malleco prov., Parque Nacional Nahuelbuta ( JAD 1682 / 2), 26 December 1984, J. A. Downes, 1 male, red ( CNCI) . Cautin prov. 10 km E Villarrica, 27 December 1992, G. Spinelli, 1 male ; 17 km southwest Villarrica, 6 December 2003, G. Spinelli, 1 male, red. Valdivia prov., Puringue Pobre , comarca Mariquita ( JAD 1692 / 1), 8 January 1985, J. A. Downes, 3 males, 1 female, red ( CNCI) ; Fundo San Martín ( JAD 1669 / 1), 15 December 1984, J. A. Downes, 1 female, red ( CNCI) . Llanquihue Prov., Ensenada ( JAD 1723 / 1), 8 February 1985, J. A. Downes, 1 females, red ( CNCI) ; same date except 9 February 1985, 1 male; same data except Lago Verde , ( JAD 1696 / 5), 12 January 1985, 2 males, 1 female ( CNCI) ; Parque Nacional Vicente Pérez Rosales, río Petrohue ( JAD 1695 / 1), 11 January 1985, J. A. Downes, 1 female, red ( CNCI) ; río Peulla, Casa Pangue , 41 ◦ 02 ′ 55.0 ′′ S, 71 ◦ 52 ′ 31.2 ′′ W, 366 m, 18 February 2008, M. Donato, 10 males, Malaise trap ; same data except 2 females, red. Chiloé prov., Huillinco ( JAD 1690 / 3), 3 January 1985, J. A. Downes, 1 male, red ( CNCI) ; same data except ( JAD 1691 / 2), 4 January 1985, 1 female, ( CNCI) ; same data except ( JAD 1722 / 1), 8 February 1985, 2 males, ( CNCI) . Coihaique prov., Coihaique ( JAD 1717 / 1), 3 February 1985, J. A. Downes, 1 male ( CNCI) .

Discussion

Characters to distinguish D. shannoni from D. reynoldsi may be found in the key and in the discussion under the description of the latter species.

Figures

Figure 7. Distribution of Dasyhelea patagonica, Dasyhelea reynoldsi and Dasyhelea shannoni.

Figure 9. Dasyhelea shannoni Ingram and Macfie: (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.