Ectatoderus nigrofasciatus Tan & Wahab, 2021

Tan, Ming Kai, Japir, Razy, Chung, Arthur Y. C., Wahab, Rodzay Bin Haji Abdul & Robillard, Tony, 2022, Taxonomy and bioacoustics of scaly crickets (Orthoptera, Mogoplistidae Mogoplistinae) from Borneo and Singapore, Zootaxa 5213 (2), pp. 177-189 : 181-182

Ectatoderus nigrofasciatus Tan & Wahab, 2021

( Fig. 3 )

Ectatoderus nigrofasciatus Tan et al., 2021: 412

Ectatoderus nigrofasciatus — Tan et al. 2022b: 600

Ectatoderus sp. — Tan & Wahab 2018: 132

Specimen examined. Holotype: BRUNEI DARUSSALAM • ♂; Belait District, Jalan Labi near Andulau Forest Reserve , N4.63354, E114.51047, 76.6±5.0 m.a.s.l.; 7 July 2019, 20h42; on rattan foliage; coll. M.K. Tan; BRU.19.70 ( UBDM)

Additional specimens examined. BRUNEI DARUSSALAM • 1♂; Temburong District, Kuala Belalong Field Studies Centre, along Sungei Mata Ikan , N4.54742, E115.15715, 73.8± 27.9 m.a.s.l.; 22 September 2016, 22h33; on a foliage of a tree after rain; coll. M.K. Tan; KB.16.4 ( ZRC) • 1♂; Temburong District, Kuala Belalong Field Studies Centre, along Sungei Mata Ikan , N4.54733, E115.15720, 113.4± 14.2 m.a.s.l.; 23 September 2016, 19h00; on a foliage of a tree after rain; coll. M.K. Tan; KB.16.15 ( ZRC)

Remarks. When Ectatoderus nigrofasciatus Tan et al., 2021 was first described, the basal part of the male genitalia of the holotype was not examined ( Tan et al., 2021: Fig. 7 ). The apical part of the male genitalia, previously thought to be the complete genitalia, was considered to resemble that of Ectatoderus argentatus Ingrisch, 2006 from Thailand. However, after examining more specimens collected from Brunei Darussalam, it was found that the basal half of the male genitalia of E. nigrofasciatus has in fact the medial valve curved to a spiral. This character is more similar to that in Ectatoderus angusticollis Chopard, 1969 from Singapore ( Fig. 3 ). Below, the diagnosis is revised accordingly.

Revised diagnosis. The species is characterised by the scapus being dorsally black, but ventrally and laterally brown, and the antennae being entirely black basally; the head has a distinct black band behind eyes; and the male phallic complex is very large and forming a spiral. The new species is most similar and closest in distribution to E. angusticollis . In both species, the pronotum is more strongly widening toward apex, and the TIs and TIIs are provided with black dorsal stripes. The male phallic complex is very similar to that of E. angusticollis , including the spiral-shaped medial valve and the shape of the ventro-external sclerite. The species differs from E. angusticollis by the male phallic complex being exceptionally larger despite of having very similar body size ( Fig. 3 ); the scapus and antennae being black (instead of testaceous); and the head being provided with distinct black and white bands behind eyes. The new species is also similar to E. argentatus having the pronotum strongly widening apically and the frons dark; it differs by the scapus and basal antennal segments being darkened instead of yellowish brown, and by the male phallic complex forming a spiral at base instead of being merely curved.

Distribution. Borneo, BRUNEI DARUSSALAM: Belait and Temburong [new locality record] Districts

Type locality. BRUNEI DARUSSALAM, Belait District, near Andulau Forest Reserve

Figures

FIGURE 3. ♂ genitalia of Ectatoderus nigrofasciatus Tan et al., 2021 (A, B) and Ectatoderus angusticollis Chopard, 1969 (C). (A) shows only the apical half of the genitalia of the holotype. Scale bar: 1 mm.

FIGURE 7. Ornebius lupus sp. nov. ♂ holotype genitalia in dorsal (A, B) and lateral (C) views. es = external sclerite, is = internal sclerite, lv = lateral valve, mv = medial valve. Scale bar: 1 mm.