Question

why Herdmania called as sea squird?

Answer 1

Herdmainia it called sea squird because, this name is ambiguous, as it can refer to any member of the sub-phylum Tunicata.

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Answer 2

HERDMANIA is called a sea squirt because they have a tendency to "squirt" out water when they are removed from their watery home. 
which means
When it is disturbed, it suddenly contracts its body, and emits inner contents with force through its apertures. Hence it is called Sea squirt...
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