A free swimming urochordate is

Herdmania

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Botryllus

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Salpa

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Ciona

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Solution

The correct option is A Salpa
Urochordata is a subphylum included in the phylum Chordata characterized by an embryonic notochord, dorsal hollow nerve chord, pharyngeal gill slits, post-anal tail and a tunic which is a firm but flexible body covering.
A) Herdmania is an ascidian tunicate. It is not free swimming.
B) Botryllus is an ascidian tunicate. It is not free swimming.
C) Salpa is a free swimming urochordate which moves by contracting and pumping water through its body.
D) Ciona is an ascidian tunicate. It is not free swimming.
So, the correct answer is 'Salpa'.

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