Abstract
Chelate legs of certain crustaceans help in detection and capture, and finally carry the food to the trophic devices. The first and second pair of chelate leges (Periodpods) of M. lamarrei were studied to understand their role in food manipulation. These appendages were detached from the prawn, fixed, and processed. Samples were observed and photographed under an SEM (JEOL JSM 35C).Six types of bristles/setae have been observed on these podomeres (Figs. 1-11). However, the bristles on podomeres of the second leg are sparsely arranged. The toothed and serrate setae are also missing from the propodite of the second leg. The aboral and adoral surfaces of propodite of I chelate leg have two different types of sensory bristles. The serrate setae are aboral, each with a central shaft (120 μm long) and bilateral projections (15.5. μm long); the adoral ones are toothed setae (297 μm) with sunken base and denticulation at the distal end. A third type, the sawtoothed setae, are on the proximal part of the dactylopodite. These are arranged in 7-8 rows of 4-9 setae each.
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