Ornebius pullus Ingrisch, 2006

Tan, Ming Kai, Japir, Razy, Chung, Arthur Y. C. & Wahab, Rodzay Bin Haji Abdul, 2021, New species and taxonomic notes of scaly crickets (Orthoptera: Mogoplistidae Mogoplistinae) from Borneo, Zootaxa 5048 (3), pp. 407-421 : 416-419

Ornebius pullus Ingrisch, 2006

( Figs. 8–10 )

Ornebius pullus Ingrisch, 2006: 157

Ornebius pullus — He et al., 2021: 88

Ornebius cf. pullus — Tan, 2012: 34; Tan & Ingrisch, 2013: 25 ; Tan, 2017: 55; Tan, 2019: 335

Material examined. 1 male ( BRU.19.13), BRUNEI DARUSSALAM, Belait District, Jalan Labi near Andulau Forest Reserve , N4.62238, E114.51047, 101.3± 6.4 m.a.s.l., on foliage, 24 February 2019, 2052h, coll. M. K. Tan & H. Yeo ( ZRC) ; 1 male ( BRU.19.74), BRUNEI DARUSSALAM, Belait District, Jalan Labi near Andulau Forest Reserve , N4.63352, E114.51061, 89.0±7.1, on foliage, 8 July 2019, 2119h, coll. M. K. Tan ( UBDM) .

Other material examined. 1 male (D18.F.03), SINGAPORE, Mandai , secondary forest between Mandai Road and Upper Seletar Reservoir, 13 November 2015, night, coll. M. K. Tan ( ZRC) .

Remarks. The male specimens from Belait District agree with the original description of O. pullus (see Ingrisch, 2006) from Brunei-Muara District of Brunei Darussalam by habitus, size ( Figs. 8 , 9 ), shapes and colours of the epiproct and the paraproct process, as well as by the shape of phallic complex. However, the colour of the tegmen can be variable. While in one male (BRU.19.13) the colouration of the tegmen agrees with that of the holotype from Brunei-Muara, in the other male (BRU.19.74) the colour of the tegmen is somewhat intermediate between those of O. pullus and O. flori from Kinabalu in Sabah.

Tan & Ingrisch (2013) previously noted that this species may have also occurred in Singapore, although there are some variations from the Bruneian specimens. Specifically, the apices of the membranous lateral valves of the male phallic complex can vary in their length and prominence and the tegmen colouration of the Singapore specimens is darker than those from Brunei ( Fig. 10 ).

We postulate that O. pullus from Brunei and Singapore may either represent a species complex or a polymorphic species. Molecular phylogeny may be useful to resolve this problem.

Distribution. Within Brunei Darussalam, this species can be found in the western areas (i.e., Belait and Brunei-Muara Districts, it is probably also found in Tutong District between Belait and Brunei-Muara), but not in the eastern part of Brunei (i.e., Temburong District) (see Tan & Wahab, 2018). One potential explanation is that O. pullus is found in the flatter terrains in Belait and Brunei-Maura Districts rather than the hilly terrains of Temburong District.

Figures

FIGURE 8. Ornebius pullus Ingrisch, 2006 males in their natural habitats in Belait: BRU.19.13 (A) BRU.19.74 (B).

FIGURE 9. Ornebius pullus Ingrisch, 2006 male habitus in dorsal view: Belait (A, B) and Singapore (C). Scale bar: 1 mm.

FIGURE 10. Ornebius pullus Ingrisch, 2006 male tegmen in ethanol (A–C) and dried-preserved (D–F) and male abdominal apex (G–I) in dorsal views: Belait (A, B, D, E, G, H) and Singapore (C, F, I). Scale bars: 1 mm.