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Class 9-10, JEE & NEET
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You are given Leech, Nereis, Scolopendra, Prawn and Scorpio/i. All have segmented body organisation. Will you classify them in one group? If not give the important characters based on which you will separate these, organisms into different groups.
1. Leech and Nereis have metameric segmentation (external segmentation corresponding to internal segmentation), closed circulatory system and unjointed appendages. They belong to annelida.
2. Scolopendra, Prawn and Scorpion have open circulatory system and jointed appendages. They belong to arthropoda.