Systolederus cinereus Brunner von Wattenwyl, 1893

Tan, Ming Kai, Vu, Trung Thanh, Le, Cuong Viet Canh & Pham, Thai Hong, 2023, Pygmy grasshoppers (Orthoptera: Tetrigidae) from B ạch Mã National Park, central Vietnam, Zootaxa 5319 (2), pp. 199-223 : 217

Systolederus cinereus Brunner von Wattenwyl, 1893

( Figs. 18–20 )

Systolederus cinereus Brunner von Wattenwyl, 1893: 105 (holotype —female, Myanmar, Carin Cheba [= Karen Hills]; in the Natural History Museum of Genova).

Systolederus cinereus — Kirby, 1910: 20; Kirby, 1914: 44; Günther, 1939: 170; Blackith, 1992: 171; Mahmood et al., 2007: 1282; Storozhenko & Dawwrueng, 2015: 536 .

Systolederus ridleyi Hancock, 1909: 401 (holotype —female, Singapore, Singapore Botanical Garden ; in the Oxford University Museum of Natural History, UK), syn. nov.

Teredorus ridleyi — Hancock, 1915: 110.

Systolederus ridleyi — Günther, 1939: 169; Blackith, 1992: 174; Devriese & Husemann, 2023: 340.

Material examined. VIETNAM, Th ừa Thiên Hu ễ province, Bạch Mã National Park: •5Ô and 3♀; open stream near Bạch Mã National Park, N16.22036 E107.88702, 72.9± 6.3 m.a.s.l.; 8 March 2023, 11h01; on a boulder or rock; coll. M.K. Tan & V. T . Trung; VIET . 23.31–38 ( ZRC) •1Ô; along stream near Bạch Mã National Park , N16.22419 E107.88233, 57.4± 4.5 m.a.s.l.; 8 March 2023, 19h37; on a tree trunk; coll. M.K. Tan & V. T . Trung; VIET .23.50 ( VNMN).

Remarks. Images of the holotypes of C. cinereus and C. ridleyi are available in the internet catalogue Orthoptera Species File ( Cigliano et al., 2023). The comparison of original descriptions and photos of both species, as well as all materials examined by Sergey Yu. Storozhenko from Southeast Asia, allows proposing a new synonymy: Systolederus cinereus Brunner von Wattenwyl, 1893 = Systolederus ridleyi Hancock, 1909 , syn. nov. The specimens from Bạch Mã National Park represent the first record of this species in Vietnam.

Ecology. This species was found along rivers, on rocks and substrate near the fast-flowing water. Nevertheless, it has also been found along forest edges near a river and dwelling among tree trunks.

Distribution. Myanmar, Thailand, Malaysia, Singapore; Vietnam: Thừa Thiên Huễ Province, Bạch Mã National Park [new].

Type locality. Myanmar, Carin Cheba .

Figures

FIGURE 18. Systolederus cinereus ♀ (VIET.23.31) (A, B) and ♀ (VIET.23.32) (C, D) dorsal (A, C) and lateral (B, D) views of habitus. Scale bars: 5 mm.

FIGURE 19. Systolederus cinereus adults (VIET.23.50) dwelling on a tree trunk (found together with Tegotettix bufocrocodil) (A) and rocky surfaces with mosses near the river (B).

FIGURE 20. Systolederus cinereus adults dwelling on a rock near the river (A) and possibly a mating pair together on a tree trunk (B).