Abstract
The sensilla on the ventral, lateral, and dorso-proximal sides of the first tarsi of adult Amblyomma americanum (L.) were studied by scanning and transmission electron microscopy. Only a few sensilla have dendrites in the shaft and are thick-walled, with either a single apical slit opening or 8 longitudinal slit grooves along the whole shaft. Based on their structure, these sensilla are assumed to be chemoreceptors. Sensilla with a single apical opening also possess 2 mechanoreceptive dendrites inserted at the setal base. All other sensilla are assumed to be solely mechanoreceptors since they have basal tubular bodies and no dendrites in the setal shaft.
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