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Biol Bull 176: 155-160. (April 1989)
© 1989 Marine Biological Laboratory
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Identified Settlement Receptor Cells in a Nudibranch Veliger Respond to Specific Cue

STUART A. ARKETT 1, FU-SHIANG CHIA 2, JEFF I. GOLDBERG 2, and RON KOSS 2

1 Department of Biology, University of Victoria, Victoria, British Columbia, Canada V8W 2Y2
2 Department of Zoology, University of Alberta, Edmonton, Alberta, Canada T6G 2E9

Intracellular electrode recordings from sensory cells on the propodium of metamorphically competent veligers of the nudibranch Onchidoris bilamellata show a distinct response to a known settlement cue. Sensory cells responded to seawater conditioned with live barnacles with a slow (up to 60 s), small amplitude (3-15 mV) depolarization. Lucifer Yellow injections of these cells reveal a single, flask-shaped cell, with dendritic processes extending to the surface of the propodium. We propose that these cells are primary receptor cells that are responsible for the detection of the specific settlement cue for Onchidoris veligers.

Submitted on November 15, 1988
Accepted on January 30, 1989




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