Trichophallus capillatus Ingrisch, 2024
publication ID |
https://doi.org/10.11646/zootaxa.5600.1.1 |
publication LSID |
lsid:zoobank.org:pub:C553BC28-88FF-481D-A639-2188B29DABE7 |
DOI |
https://doi.org/10.5281/zenodo.14970588 |
persistent identifier |
https://treatment.plazi.org/id/03A6895C-FFF5-FF8D-FF6C-D0DCFAF71625 |
treatment provided by |
Plazi (2025-03-05 07:58:06, last updated 2025-03-05 08:10:31) |
scientific name |
Trichophallus capillatus Ingrisch, 2024 |
status |
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Trichophallus capillatus Ingrisch, 2024 View in CoL
( Figs 68 View FIGURE 68 , 69 View FIGURE 69 )
Material studied. Holotype male: Papua New Guinea, Wau , nr Wau Ecological Institute, 29 August 1981 coll. G.K. Morris.
Measurements. Male holotype, (length in mm): body 19; pronotum 4.8; tegmen 21.5; hind femur 12.5 mm.
Diagnosis. T. capillatus differs from other species of the genus described so far by the distinctive shape of the titillators on the male phallus ( Ingrisch 2024).
Comments. The file of T. capillatus ( Fig. 68 View FIGURE 68 ).
Stridulation. Call a regular repetition of silence-separated trains of rapid-decay, single-tooth sourced, transient pulses ( Fig. 69 View FIGURE 69 AB). The call manifests spectrally as a 25-kHz wide band of frequencies ( Fig. 69C View FIGURE 69 ) centred near 48 kHz. The carrier frequency of this insect is entirely confined to the ultrasonic; there is no significant sound energy in the audio range. At the time resolution of Fig. 69A View FIGURE 69 each train has a characteristically ‘top shaped’ amplitudeenvelope (a shape like a toy top lying on its side): pulse peak amplitudes begin very faintly, rise steadily then fall away again slightly over the last third. Stridulatory file count of 88–93 teeth reported by Ingrisch (2024) accords reasonably with the 68 transient rapid-decay pulses in the train shown in Fig. 69B View FIGURE 69 . Mean values for 10 calls of our lone singer: trains 30 ms long, repeated with a mean period of 168 ms. The transients are somewhat erratically separated in time from each other within the train ( Fig. 69B View FIGURE 69 ).
Broadband spectra should not be discounted as noisy stridulatory incompetence. Bands could theoretically be adaptive through ranging: differential attenuation of frequencies with distance is accentuated by a cluttered vegetation. The spectral shape of the band could be coding for distance, so helping to detect the trespass of a neighbouring male competitor or further the success of a female localizing her mate ( Morris et al. 2016).
Ingrisch, S. (2024) Revision of the genus Trichophallus Ingrisch, 1998 with notes on the genera Secsiva Walker, 1869 and Subrioides C. Willemse, 1966 (Orthoptera: Tettigoniidae: Conocephalinae: Agraeciini). Zootaxa, 5442 (1), 1-66. https://doi.org/10.11646/zootaxa.5442.1.1
Morris, G. K., Braun, H. & Wirkner, C. S. (2016) Stridulation of the clear-wing meadow katydid Xiphelimum amplipennis, adaptive bandwidth. Bioacoustics, 25, 225-251. https://doi.org/10.1080/09524622.2016.1138883
FIGURE 68. Trichophallus capillatus sp. nov. holotype male: A) Stridulatory file, scale 1 mm; B) habitus dorsal view with left wings extended; C) habitus lateral view.
FIGURE 69. Trichophallus capillatus acoustic analysis: A) Two calls taken from a longer series, very faint to human ear; B) One call at higher time resolution showing train of transient pulses; C) Entirely ultrasonic broad band symmetrical spectrum, low-Q, centred near 50 kHz; recording made with ¼” B&K so flat to ~70 kHz.
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