Chimarrhometra orientalis ( Distant, 1879 )

Ye, Zhen, Zhou, Yanyan & Bu, Wenjun, 2016, Description of a new species of Chimarrhometra Bianchi, 1896 (Hemiptera: Heteroptera: Gerridae) from China, Zootaxa 4175 (2), pp. 180-188 : 182

Chimarrhometra orientalis ( Distant, 1879)

( Figs. 1, 2 , 5, 6 , 9, 10 , 13, 14, 15 , 19, 20 , 24 )

Halobates orientalis Distant, 1879: 126 .

Chimarrhometra orientalis (Distant) ; Bianchi, 1896: 71; Distant, 1903: 190; Pavia, 1919: 364; Andersen, 1982: 23. Rheumatotrechus himalayanus Kirkaldy, 1908: 452; Paiva, 1919: 364.

Gerris monticola Distant, 1910: 141 ; Distant, 1911: 142; Esaki, 1929: 412; Lindberg, 1939: 19.

Material examined. Nepal: 4 apterous males, 2 apterous females, Dhulikhel (27°37'N, 85°33'E), 20.VII.2014, coll. Tongyin Xie ( NKUM) ; 5 apterous males, 3 apterous females, Pokara , Mt. Annapurna (28°22'N, 83°57'E), 16.VII.2014, coll. Tongyin Xie ( NKUM) .

Diagnosis. The diagnostic features of C. orientalis are the strongly incrassate male fore femur ( Fig. 1 ); abdominal segment VIII dorsally with subtle depression in lateral view ( Fig. 6 ); the sub-rectangular pygophore ( Figs. 9, 10 ); the antler-shaped processes on the caudal margin of the pygophore bear a broad posterior lobe and a shorter triangular anterior lobe ( Figs. 9, 10 ); proctiger slender with dense hairs on posterior margin ( Fig. 13 ); paramere falciform, medial part bending inwards, with apices crossing beneath pygophore and gradually tapering ( Figs. 14, 15 ); inner lobe of first gonopophysis relatively stout, infuscated, and with several uniformly distributed setae ( Figs. 19, 20 ).

Distribution. India, Nepal, Pakistan ( Fig. 24 ).

Figures

FIGURE 24. Geographical distribution of species of Chimarrhometra.

FIGURES 1 – 4. Habitus of Chimarrhometra spp. 1. C. orientalis (Distant, 1879), male; 2. C. orientalis (Distant, 1879), female; 3. C. yunnanensis sp. n., male (holotype); 4. C. yunnanensis sp. n., female (paratype); Scale = 4.0 mm.

FIGURES 5 – 8. Abdominal segment VIII of Chimarrhometra spp. (males). 5. C. orientalis (Distant, 1879), dorsal view; 6. C. orientalis (Distant, 1879), lateral view; 7. C. yunnanensis sp. n., dorsal view; 8. C. yunnanensis sp. n., lateral view; Scale = 0.2 mm.

FIGURES 9 – 12. Pygophore of Chimarrhometra spp. (males). 9. C. orientalis (Distant, 1879), ventral view; 10. C. orientalis (Distant, 1879), dorsal view; 11. C. yunnanensis sp. n., ventral view; 12. C. yunnanensis sp. n., dorsal view; Scale = 0.2 mm.

FIGURES 13 – 18. Proctiger and paramere of Chimarrhometra spp. (males). 13 – 15. C. orientalis (Distant, 1879), 13. proctiger in dorsal view; 14. paramere in ventral view; 15. paramere in dorsal view. 16 – 18. C. yunnanensis sp. n.: 16. proctiger in dorsal view; 17. paramere in ventral view; 18. paramere in dorsal view. Scale = 0.2 mm.

FIGURES 19 – 21. First gonocoxa (Gx 1) and first gonopophysis (Go 1) of Chimarrhometra spp. (females). 19. C. orientalis (Distant, 1879), Gx 1 + Go 1; 20. C. orientalis (Distant, 1879), inner lobe of Go 1; 21. C. yunnanensis sp. n., inner lobe of Go 1.