The present paper deals with association of Pinnotheres crabs as commensalist in Soletellina violacea and Placuna placenta. The sex-wise percentage composition of Pinnoheres maculatus (Say) varies in Soletellina Both the sexes of Pinnoheres maculatus were highest in the month of July (16.12%) and highest percentage of female crabs noticed (63-7046) during January to March. In PIacuna placenta the percentage of female crab was highest in December (70.0%) and lowest in July (25.0%).

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