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**Hint:**The Hemichordata

*Balanoglossus sp*. is known as tongue worm.

*Tornaria larva*is of some hemichordata species.

**Complete answer:**

*Balanoglossus sp*. is a Hemichordate species. It belongs to the class Enteropneusta of the phylum Hemichordata.

Being a Hemichordate, it links between non-chordata and chordate animals. Because of this reason it has an important evolutionary significance. It is a burrowing animal and exclusively marine. These ocean-dwellers are also called acorn worms. In Hemichordates, their body is divisible into proboscis, collar, and trunk- this is the basic unique characteristic feature. Head and tail are absent in

*Balanoglossus.*

The proboscis of this animal protrudes outside and appears like a tongue. This is the reason they are called ‘tongue worms’. The young swimming juveniles produced by them are called

*Tornaria larva*. It is a planktonic larva.

*Tornaria*appears very similar to the bipinnaria larvae of some Echinoderms (Starfishes). They have convoluted ciliary bands running around the body.

*Tornaria larva*was first described by Muller, in 1850. It possesses an oval and transparent body. It measures up to 3 mm in size. At the anterior end of its body, a tuft of cilia and a pair of eye spots are present. Its digestive system is differentiated into oesophagus, stomach and intestine.

__So, the correct answer is B.____Tornaria____.__**Note:**The group of parasitic crustaceans called ‘

*Pentastomida*’ are also commonly called tongue worms. They basically belong to the subphylum Crustacea. It is assumed that they are the connecting links between annelids and arthropods- Though it is a debatable concept.

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