Xenocaucus kimbozensis, Weirauch & Forthman & Grebennikov & Baňař, 2017

Weirauch, C., Forthman, M., Grebennikov, V. & Baňař, P., 2017, From Eastern Arc Mountains to extreme sexual dimorphism: systematics of the enigmatic assassin bug genus Xenocaucus (Hemiptera: Reduviidae: Tribelocephalinae), Organisms Diversity & Evolution (New York, N. Y.) 17 (2), pp. 421-445 : 439

Xenocaucus kimbozensis , n. sp.

Figures 3 , 5 , 6 , 7 , and 10.

Diagnosis Female: recognized by the small body length (∼ 2.2 mm), the head slightly longer than wide, appearing elongate with pointed apex in dorsal view ( Fig. 3 ), the pronounced lateral tufts of setae on the head ( Fig. 7 ), the foretrochanter with a stout ventral process ( Fig. 6 ), the stout forefemur ( Fig. 6 ), and the short setae on the lateral margin of the dorsal laterotergites ( Fig. 3 ).

Description Female: total length: 2.19 mm, total length: greatest abdominal width 1.9; wing condition and general vestiture as in generic description. Coloration: uniformly light brown to yellowish. Structure: head: slightly longer than wide in dorsal view, with slightly elongated anteocular area, glabrous area on vertex elongate, longitudinal sulcus extending about 2/ 3 of glabrous area, tuft distinct, lateral fringes longer laterally than around posterior half of head. Antenna: scape length: head length 1.3, slender. Labium: first visible segment: head length 0.7. Thorax: transverse suture between pronotum and mesonotum indistinct, pronotal disk flat and rectangular, pronotum distinctly longer than mesonotum (ratio 1.7), greatest pronotal width: pronotal length 1.5. Legs: foretrochanter with ventral process, forefemur length: body length 0.3, forefemur stout. Abdomen: about as long as wide, length: width 1.14, intersegmental membrane between tergites 3 and 4 straight, intersegmental membrane between tergites 6 and 7 slightly curved anteriad, intersegmental membrane between tergites 7 and 8 straight, mediotergites 1/2 and 3 glabrous, setae on lateral margin of dorsal laterotergites short, setae dorsally on dorsal laterotergites long. Genitalia: as in generic description.

Male: unknown. Immatures with wing pads suggest that males are macropterous.

Immatures: as in Fig. 3 .

Etymology: named for the holotype locality, Kimboza Forest in Tanzania.

Material examined: holotype: Tanzania Morogoro: Kimboza Forest , 7.02417° S, 37.80806° E, 217 m, 9 Jan. 2012, V. Grebennikov, 1;female (00020639) ( CNC) . Paratypes: Tanzania: Morogoro: Kimboza Forest , 7.0218° S, 37.8035° E, 295 m, 16 Oct. 2014, V. Grebennikov, 1;female (00117773) ( CNC) . Kimboza Forest , 7.02417° S, 37.80806° E, 217 m, 9 Jan. 2012, V. Grebennikov, 1;female (00020640) ( CNC) . North Pare Mts , 3.75° S, 37.66667° E, 1281 m, 9 Jan. 2012, V. Grebennikov, 4;female (00020651–00020654) ( CNC) . Other specimens examined: Tanzania: Kimboza Forest , 7.02417° S, 37.80806° E, 217 m, 9 Jan. 2012, V. Grebennikov, 11;juvenile (00020610–00020620) ( CNC) . North Pare Mts , 3.75° S, 37.66667° E, 1281 m, 09 Jan. 2012, V. Grebennikov, 1;juvenile male, (00020655) ( CNC) .

Xenocaucus mancinii China and Usinger.

Figure 3 .

Figures

Fig. 3 Dorsal habitus of X. chomensis, n. sp., (female, unsexed immature, and male immature), X. ethiopiensis, n. sp., (male holotype and female), X. kimbozensis, n. sp., (female, unsexed immature, and male immature), the female holotype of X. mancinii, and X. nguru, n. sp., (female, unsexed immature, and male immature). dld setae dorsally

Fig. 5 Lateral habitus of females of the seven East African species of Xenocaucus and the male of X. ethiopiensis. fl flagellomeres, lb1–3 first, second, and third visible labia segments, om ommatidium, pd pedicel; scale bars, 1 mm

Fig. 6 Ventral habitus of the seven East African species of Xenocaucus and the male of X. ethiopiensis; abbreviation: vptr, ventral process on trochanter

Fig. 7 Details of the head (dorsal, lateral, and/or ventral view) of selected species of Xenocaucus