In some plants and animals, some morphological characters are evident by which they can be related to two different groups, and so they came to be called ‘connecting links’. Example: Peripatus have characters like, segmented body, thin cuticle, and parapodia-like organs are present. These animals also show tracheal respiration and an open circulatory system similar to arthropods, thus indicating that Peripatus is the connecting link between annelida and arthropoda.
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