Abstract
Five types of cuticular sense organs are found on the walking legs and pedipalps of the scorpion, Heterometrus fulvipes: long straight hairs, small white hairs, short straight bristles, trichobothria and slits. A large compound slit sensillum with 13 slits is present in the basitarsal segment of each walking leg. Just born animal possess only small white hairs on pedipalps and long straight hairs on walking legs, while the 1st instar animals possess all the five types of cuticular sensilla. Sensory hairs on pedipalps and walking legs increase from just born to adult scorpion except the wind sensitive trichobothria. The density of receptors increase from proximal to distal segments of walking legs and pedipalps. Cobalt back filling and silver intensification of leg and pedipalp nerves revealed single innervation to short straight bristles and multiple innervation to long straight hairs (7), small white hairs (20), trichobothria (6)and slit sensilla (2).
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