EVERYDAY SCIENCE

Detailed explanation-1: -Crustaceans bear two pairs of antennae. The pair attached to the first segment of the head are called primary antennae or antennules. This pair is generally uniramous, but is biramous in crabs and lobsters and remipedes. The pair attached to the second segment are called secondary antennae or simply antennae.

Detailed explanation-2: -Marine and terrestrial hermit crabs capture odours with dense arrays of bristle-like chemosensory hairs, called aesthetascs, which they flick back and forth using antennules (figure 1). These arrays operate at the same scale where a bristled surface can act as either a solid surface or a leaky rake [7].

Detailed explanation-3: -Function of Antennules. Antennules function in olfaction; non-olfactory chemoreception; mechanoreception, including detecting hydrodynamic, tactile, and proprioceptive cues; and probably reception of stimuli other than chemical and mechanical.

Detailed explanation-4: -Crustaceans are generally aquatic and differ from other arthropods in having two pairs of appendages (antennules and antennae) in front of the mouth and paired appendages near the mouth that function as jaws.

Detailed explanation-5: -Furthermore, the antennule is a motor organ-it is flicked to temporally and spatially sample the animal’s chemo-mechanical surroundings-and this information is used in resolving the structure of chemical plumes and locating the odor source.