Contact: Dr. Coby Schal
North Carolina State University
Caption: This is the head of a male German cockroach, showing the four major external chemosensory-paired appendages. The antennae extend upward (black compound eyes behind them), the longer maxillary palps and shorter labial palps extend downward, and the paired paraglossae are on either side of the mouth. Each appendage contains many sensory hairs, some of which function in gustation. A tastant is delivered to the mouth in a dyed (blue) drop of water.
Credit: Ayako Wada-Katsumata and Andrew Ernst
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