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| Format: | Recurso digital |
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Zenodo
2025
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| Matèries: | |
| Accés en línia: | https://doi.org/10.5281/zenodo.14970548 |
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Taula de continguts:
- <p><b><i>Segestidea novaeguineae</i> (Brancski, 1897)</b></p><p>(Figs 33, 34)</p><p><b>Specimens studied.</b> (1 male) Papua New Guinea, McAdam Nat. Park, Bulolo Gorge, 28 viii 1981, Coll. G.K.Morris.</p><p><b>Systematics.</b> The male fits perfectly the redescription (F. Willemse 1977, 1979).</p><p><b>Comments.</b> Common name palm katydid. Several <i>Sexava</i> spp. are pests of Oil Palm (Page 2005).</p><p><b>Distribution.</b> The locality of this species is covered by the distribution as mapped in F. Willemse (1977, 1979).</p><p><b>Stridulation.</b> Sustained over many seconds, the buzzes of the single recorded male (Fig. 34A) time resolved to regularly repeated wave trains of about 60 ms duration (Fig. 34B) with a regular period of a quarter second (0.25 s). The trains are characterized by a highly erratic amplitude envelope (Fig. 34B). Spectrum frequencies formed one broad aggregate in the audio range (Fig. 34D): for 10 averaged calls this aggregate centred on 10.0 kHz. Though the spectrum is markedly low Q, the waveform of the pulse is not a train of distinctly time-separated transients and at higher time resolution these are seen to be almost sinusoid (Fig 34C); visible are distortions of the sine waves which might be the result of overloading the recording equipment or alternatively of a low sampling rate.</p><p>A related species <i>Sexava femorata</i> C. Willemse, exhibits mandibular stridulation as a protest sound.A restrained female moved her labrum to and fro, sliding it “vertically over the anterior surface of her mandibles” (Lloyd & Gurney 1975). Working with a recorder (Uher 4000 Report L) limited to the audio frequency range these authors found sound spectral energy for this defensive strigin near 3.5 kHz.</p>