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A simple, epithelial sense organ composed of one cell or of a few cells.



in invertebrates, a simple cutaneous organ of touch, taste, or chemical sense. The external part of a sensillum is formed by the cells of the integuments and is represented by a hair (tactile sensillum) or a slender cuticular plate, a peg, or a cone lodged in a depression (olfactory and gustatory sensilla). At the sensillum’s base there are one or more sensory nerve cells connected to the central nervous system by nerve fibers. In arthropods, tactile sensilla (hairs) are usually found on all parts of the body. Olfactory sensilla are especially numerous on antennae; for example, a worker bee has as many as 6,000 sensilla on each antenna. Gustatory sensilla are found on mouthparts. Often individual sensilla unite to form more complex sense organs.

References in periodicals archive ?
Almost all antennular setae are located on the third and fourth segments; these setae have all been demonstrated to have sensory properties and are, therefore, sensilla (Nott and Foster, 1969; Walker et al.
Chaetotaxy: Sensilla of legs and urogomphi are identified and enumerated by region or area of origin, using a version of systems (Wolfe and Roughley 1985; Nilsson 1988; Alarie et al.
Palpal segment 2 at most as long as 4, usually shorter; Newstead sensilla in a patch situated in basal half of palpal segment 3; anterior katepisternal setae absent; labial furcal sclerite present.
White arrows indicate cuticular sensilla and white bar indicates 10 [micro]m length.
Antennal sensilla in five Psychodini moth flies (Diptera: Psychodidae: Psychodinae) pollinators of Arum spp.
Distribution of sensilla on antenna and rostrum in nymphs and adults of Cimex hemipterus Fabricius (Hemiptera, Cimicidae).
Compared with the left antenna, the right contains more sensilla dedicated to smell, known to play a key role in honeybee communication.
They zoomed in on the proboscis' so-called sensilla, hair-like structures that serve as the fly's taste buds.
They coated them with a dense three-dimensionally ordered layer of titanium dioxide nanotubes oriented vertically, like the sensilla.
Antennal sensilla are significant sensory receptors responsible for chemo and mechanical signals implicated in various behaviors (host location and discrimination behaviors.
Ancorae large, pointed, inwardly curved, the membrane near their base densely provided with sensilla.