Hearing asymmetry and auditory acuity in the Australian bushcricket Requena verticalis (Listroscelidinae; Tettigoniidae; Orthoptera)
Winston J. Bailey* and
Suanne Yang
Department of Zoology, University of Western Australia, Nedlands,
Western Australia 6009, Australia
Present address: Department of Biology, Washington State University, Vancouver
Campus, 14204 NE Salmon Creek Avenue, Vancouver, WA 98686-9600, USA
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Fig. 1. A schematic view of the auditory tracheal anatomy of Requena
verticalis viewed from anterior from the bisected animal. The open
auditory spiracle is shown as grey against the black auditory bullae. (Drawn,
with permission, from Bailey and Kamien,
2001 ).
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Fig. 2. Association between left—right symmetry of spiracle area and female
body size expressed as pronotum length. (r2=0.004)
(N=29).
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Fig. 3. Phonotaxis by female Requena verticalis to speakers placed left
and right of the arena. Traces of movement patterns to each side have been
overlaid to the right side with the speaker position shown on right of the
arena. Tracing of paths of all females (paired and unpaired cases) as (left) a
control unblocked condition, with the call at 82 dB measured at the centre of
the arena, (centre) with spiracle blocked with cotton at 82 dB and (right)
with spiracle blocked at 51 dB. The concentric circles are distances 30 cm and
60 cm from the centre, at which point the females were timed in their progress
towards the speaker (see text).
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© The Company of Biologists Ltd 2002
