Nemestrinus exalbidus (Lichtwardt, 1907)

El-Hashash, Arafa Elsayed, Badrawy, Haitham Badrawy Mousa & Ibrahim, Ayman Mohyie-Eldin, 2021, A review of tangle-veined flies (Nemestrinidae, Diptera) in Egypt, ZooKeys 1071, pp. 11-42 : 11

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Nemestrinus exalbidus (Lichtwardt, 1907)


Nemestrinus exalbidus (Lichtwardt, 1907)

Figures 42-51 View Figures 42–51 , 52-60 View Figures 52–60

Nemestrina exalbidus Lichtwardt, 1907: 441. Type locality: Israel (Jerusalem).

Specimens examined.

W. Dar El-Maskhara 29°47'02.9"N, 31°24'59.9"E, 12.iv.1930 (1 f#); W. Hodein South Eastern Desert 23°5'14'"N, 35°19'45"E, 17.iii.1928 (1 m #); W. Hoff 29°53'02.6"N, 31°18'42.2"E, 12.iv.1921 (1 f#), 24.iii.1930 (1 m #); W. Zohleiga 26°07'59.9"N, 33°45'00.0"E, 27.iii.1925 (1 f#) (AZUC); Abu Rowash 30°04'30.7"N, 31°11'59.7"E, 16.iii.1927 (1 f#); Ogret El-Sheikh 29°52'50.1"N, 31°18'27.8"E, 31.iii.1926 (1 f#); W. Hoff 29°53'02.6"N, 31°18'42.2"E, 24.iii.1930 (1 m #); W. Rishrash 29°27'51"N, 31°22'2"E, 29.iii.1935 (7 m # & 4 f#) (CUC); Ogret El-Sheikh 29°52'50.1"N, 31°18'27.8"E, 14.iii.1927 (1 m #); W. Hoff 29°53'02.6"N, 31°18'42.2"E, 30.iii.1928 (1 m #); W. Zohleiga 26°07'59.9"N, 33°45'00.0"E, 25,29. iii.1925 (1 f#) (MAC); Etaka 29°26'19.1"N, 32°28'07.2"E, 22.ii.1951 (1 f#), 26.iii.1951 (1 m #); Kerdasa 30°01'32.1"N, 31°06'27.5"E, 14.iv.1951 (3 f#); Mansouriah 29°58'05.3"N, 31°08'51.9"E, 25.iv.1957 (1 m #); W. Kaber 23°26'29"N, 25°50'23"E, 1.iv.1994 (1 f#) (ASUC).


Frons covered with dense gray pollinosity except shiny black oval callus below ocellar triangle; wing hyaline, except slightly brownish along anterior margin, with a few small cells extending forward from R2+3 to M1 or M2. Abdomen orange or reddish with longitudinal median black vitta.


Length: male body 14-17 mm, wing 12.5-14.5 mm. Female body 18 mm, wing 15.5 mm. Head shiny black with white hairs; frons covered with dense gray pollinosity except shiny black oval callus below ocellar triangle; face rather conical (Figs 42-44 View Figures 42–51 , 52-54 View Figures 52–60 ). Thorax shiny black with dense whitish hairs laterally and a few dorsally. Leg orange, but femora black. Wing hyaline, except pale brownish anterior margin, with just a few small cells extending forward from R2+3 to M1 or M2 (Figs 46 View Figures 42–51 , 56 View Figures 52–60 ). The differences in cell number and structure on the wing is continuous variation and inconsistently different between males and females. Abdomen orange or reddish with longitudinal black median vitta; base of abdomen covered with dense, short, yellowish gray hairs, lateral margins of subsequent segments with dense white hairs; venter of abdomen entirely orange (Figs 47 View Figures 42–51 , 57 View Figures 52–60 ). Gonocoxite with only inner gonocoxal process, tapered apically (Figs 48 View Figures 42–51 , 49 View Figures 42–51 ); distiphallus narrow; parameral apodeme rather short, aedeagal tine narrow and curved, forming semicircle, pointed distally; ejaculatory apodeme distally broader (Figs 50 View Figures 42–51 , 51 View Figures 42–51 ). Female differentiated from male by the eyes that are more dichoptic. Female genitalia with rectangular subgenital plate, excavated proximally to approx. 1/2 length of plate (Fig. 58 View Figures 52–60 ); genital furca with small genital aperture, between projections with broad ends, and curved posteromedially with small curve on upper and lower margins (Fig. 59 View Figures 52–60 ); uterus large and flatted, spermathecae long (Fig. 60 View Figures 52–60 ).

Local distribution.

Eastern Desert, Lower Nile.

Geographical distribution.

Egypt, Iran, and Israel ( Sack 1933; Bernardi 1973; Richter 1988).