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Animal Kingdom
Phylum Chordata: Features
1 question from 1 paper, each with its answer.
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Concepts tested
- Post-anal tail as chordate feature
All Questions
2001 AIPMT 1 question
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In which of the following animals post anal tail is foundA post-anal tail (a tail extending beyond the anus) is one of the characteristic features of chordates, present at least in the embryo.
The snake is a chordate (vertebrate, reptile), and its long body continues behind the cloacal opening as a tail.
Earthworm, scorpion and other invertebrates are non-chordates; the anus is at the end of the body, so there is no post-anal tail (the scorpion's 'tail' is part of its abdomen).
So a post-anal tail is found in the snake.