A) Platyhelminthes and Arthropoda
B) Echinodermata and Annelida
C) Annelida and Arthropoda
D) Mollusca and Chordata
Correct Answer: C
Solution :
Metameric segmentation is the characteristic of Annelida (e.g., earthworm) and Arthropoda (e.g., cockroach). In earthworm, body consists of 100-120 ring like segments or somites called metameres. It shows true segmentation, i.e., external segmentation corresponds with internal segmentation. Cockroach also shows the metameric segmentation. Its anterior few segments are specialised to form head. Such metamerism is called heteronomous metamerism. Metameric segmentation is absent in platyhelminthes, Echinodermata, Mollusca, etc.
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