Stilobezzia (Acanthohelea) nigerrima Ingram and Macfie, 1931

Cazorla, Carla G. & Spinelli, Gustavo R., 2014, A revision of the Patagonian predaceous midges of the subgenus Acanthohelea of Stilobezzia excluding the S. (A.) edwardsi group (Diptera: Ceratopogonidae), Journal of Natural History 49 (3), pp. 155-209 : 178-179

Stilobezzia (Acanthohelea) nigerrima Ingram and Macfie, 1931

( Figure 15D )

Stilobezzia nigerrima Ingram and Macfie, 1931: 196 (female; Argentina).

Stilobezzia (Neostilobezzia) nigerrima: Das Gupta and Wirth, 1968:141 (in list); Wirth, 1974: 43 (in catalogue of New World species south of USA).

Stilobezzia (Acanthohelea) nigerrima: Spinelli and Wirth, 1993: 51 (in list; Argentina); Borkent and Wirth, 1997: 233 (in World catalogue); Borkent and Spinelli, 2000:52 (in catalogue of species of southern USA); Cazorla and Spinelli, 2007: 181 (male; Chile); Borkent and Spinelli, 2007: 85 (in Neotropical synopsis); Borkent, 2014: 135 (in online World catalogue).

Diagnosis

The only Patagonian species of Stilobezzia (Acanthohelea) with the thorax entirely dark brown, legs dark brown except coxae brown, trochanters and base of mid and hind femora slightly paler. Males sternite 9 with rounded, narrow, deep posteromedian excavation. Females anterior margin of sternite 8 convex with a U-shaped posteromedian excavation.

Distribution

Argentina (Río Negro), Chile (Malleco, Valdivia, Llanquihue, Chiloé) ( Figure 19 ).

Types

Holotype female, 1 female paratype, Argentina, Prov. Río Negro, Bariloche , 1 December 1926, F. and M. Edwards ( BMNH).

Other specimens examined

Chile, Malleco prov. , Parque Nacional Nahuelbuta, 26 December 1984, J. A. Downes, 2 females, sweep net (JAD 1682/2/7,101) ( CNCI) ; Valdivia prov., Isla Teja , 28 December 1984, J. A. Downes, 1 male, sweep net (JAD 1684/1/2) ( CNCI) ; same data except Osorno around Los Ulmos, 29 December 1984, 1 female (JAD 1687/3/1) ( CNCI) ; Puringe Pobre , 8 January 1985, J. A. Downes, 2 females, sweep net (JAD 1692/1/24,25) ( CNCI) ; Llanquihue prov. , road to Los Ulmos, 29 December 1984, J. A. Downes, 1 female, sweep net (JAD 1685/1/5) ( CNCI) ; Chiloé prov. , Huillinco, 3 January 1985, J. A. Downes, 3 females, 2 males, sweep net (JAD 1690/3/6,8,9,20,21) ( CNCI) ; same data except 4 January 1985, 3 females (JAD 1691/2/45,57,56) ( CNCI) .

Remarks

This species was redescribed and illustrated in detail by Cazorla and Spinelli (2007).

Figures

Figure 15. Male genitalia: (A) Stilobezzia (A.) curvistyla Cazorla and Spinelli (ventral view); (B) Stilobezzia (A.) curvistyla (dorsal view); (C) Stilobezzia (A.) longisternalis Cazorla and Spinelli (ventral view); (D) Stilobezzia (A.) nigerrima Ingram and Macfie (ventral view).

Figure 19. Distribution of Stilobezzia (A.) nigerrima, Stilobezzia (A.) ornaticrus and Stilobezzia (A.) tridentis.