Duolandrevus (Bejorama) lambir Gorochov, 2017

Tan, Ming Kai, Japir, Razy, Chung, Arthur Y. C. & Robillard, Tony, 2022, New taxa and notes on bark and bush crickets (Orthoptera, Grylloidea, Gryllidae Landrevinae and Podoscirtinae) from Sabah, Zootaxa 5178 (3), pp. 201-228 : 203

Duolandrevus (Bejorama) lambir Gorochov, 2017

( Figs 1 , 2 )

Duolandrevus (Bejorama) lambir – Gorochov, 2017: 230; Tan & Wahab, 2018: 128

Duolandrevus (Bejorama) nr. luzonensis – Tan & Wahab, 2017: 442 [tentative identification prior to species described by Gorochov (2017)]

Material examined. EAST MALAYSIA • 2♂; Sabah State, Sandakan, Sepilok, Rainforest Discovery Centre ; N5.87511, E117.94206, 41.5± 7.7 m.a.s.l.; 17 May 2022, 19h22; calling underneath the bark of a large tree; coll. M.K. Tan & T. Robillard; SBH.22.121, 122 ( FRC)

Remarks. This species was previously known from Lambir Hill in Sarawak and Kuala Belalong in Brunei Darussalam, both to the west of Borneo. Our specimens ( Fig. 1 ) appear to resemble the descriptions from Lambir Hill by Gorochov (2017) and the figures in Tan & Wahab (2017). It should be noted that the pseudepiphallic lophi [posterolateral epiphallic lobes] appear narrower in lateral view in the Bruneian specimen ( Tan & Wahab, 2017: Fig. 2C ). Here, we add a new locality record for this species in the east of Borneo and describe its calling song for the first time.

Ecology. This species seems to be relatively common. Multiples males were heard singing at night underneath barks of large trees.

Distribution. Borneo, Sarawak State (Lambir Hill) and Sabah State (Sepilok), Brunei Darussalam (Kuala Belalong).

Type locality. EAST MALAYSIA, Sarawak State, Lambir Hill

Calling song (2 ♂, in the field, 26.5°C) ( Fig. 2 ). The calling song consists of an echeme made up of 40–47 syllables. The first few syllables are of lower amplitude but the amplitude of subsequent syllables increases to a maximum and remains consistent. Each echeme has an average duration of 0.66±0.03 s (0.61–0.71 s). The interval between consecutive echemes is 0.87±0.14 s (0.70–1.15 s). Each syllable has an average duration of 11.6±0.7 ms (10.9–12.9 ms) and the interval between consecutive syllables is 3.5±0.8 ms (2.1–4.3 ms). The dominant frequency is 5.89±0.06 kHz (5.72–5.91 kHz).

Figures

FIGURE 1. Duolandrevus (Bejorama) lambir Gorochov, 2017 ♂ habitus in dorsal view (A); genitalia in dorsal (B) and ventral (C) views. Scale bars: 5 mm (A); 0.1 mm (B, C).

FIGURE 2. Duolandrevus (Bejorama) lambir Gorochov, 2017 ♂ calling song: oscillograms showing three echemes (A) and one echeme (B); spectrogram of the same echeme (C); power spectra of a syllable (D) where the grey line represents the power [dB] (axis name and scale in grey) and the black solid peak represents the relative amplitude (axis name in black).