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Basis of Classification: Segmentation
Concepts tested here
- Metamerism
All Questions
2006 AIPMT-PRE 1 question
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Metameric segmentation is the characteristic of -In metameric segmentation (metamerism) the body is divided, externally and internally, into a series of similar segments, with a serial repetition of at least some organs.
It is seen in annelids (for example the earthworm), in arthropods and in chordates.
In Annelida the segments (metameres) are distinctly marked and mostly similar.
In Arthropoda the body is also segmented, with the segments grouped into head, thorax and abdomen.
Platyhelminthes are unsegmented (the proglottids of tapeworms are a false segmentation), and molluscs and echinoderms are unsegmented.
So among the given pairs, metameric segmentation is characteristic of Annelida and Arthropoda.