The jawless round and suctorial mouth is a distinguishing feature of this species.

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Cyclostomes animals

Gnathostomes

Both A and C

Agnatha animals

answer is D.

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Detailed Solution

Agnatha or Agnathostomata is a subphylum of vertebrae that comprises animals lacking jaws. Furthermore, the Cyclostomata is the only class in this group. Cyclostomes are jawless animals having a suctorial funnel and a circular mouth.

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