Abstract
1. Prothoracic auditory interneurons in the primitive orthopteran Cyphoderris monstrosa (Ensifera: Haglidae) were characterized morphologically and physiologically, using intracellular recording and staining. 2. Auditory interneurons with similar morphologies to several classes of identified cells in crickets were discovered. These cell types corresponded to omega, AN1, DN1, and TN1 cells of Gryllidae. Several novel cell types were also discovered, including a second ascending cell with a distinctive morphology, and several descending and T-fibres. 3. Responses of auditory cells had a similar frequency tuning to whole auditory nerve measurements, with all cell types responding maximally to low frequencies (2–4 kHz). This is in contrast to the carrier frequency of the species acoustic signal (12 kHz). There were differences, however, in the relative sensitivities of different interneuron types at the calling song frequency, with ascending and omega cells being more sensitive at this frequency than descending or T-cells.
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