thoracic leg walking leg 2016-09-30T09:27:31Z At the thorax of a prawn there are five pairs of walking legs. They are used for crawling on the river bed. Of the five pairs of walking legs the first two pairs bear pincers at their free ends and are, therefore, called chelate legs; these along with the rostrum and the spines are regarded as organs of offence and defence. BTO:0005998 BrendaTissueOBO Marion, contact@brenda-enzymes.org