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(C) The characters described are: $1$. Endoskeleton is cartilaginous. $2$. Ectoparasitic nature with a circular, suctorial mouth. $3$. Absence of pair

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$(3)$ $Petromyzon$ sp.

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(C) The characters described are: $1$. Endoskeleton is cartilaginous. $2$. Ectoparasitic nature with a circular, suctorial mouth. $3$. Absence of paired fins and scales. $4$. Presence of $6-15$ pairs of gill slits for respiration. These features are diagnostic of the class $Cyclostomata$. Among the given options, $Petromyzon$ (lamprey) belongs to this class. $Scoliodon$ is a cartilaginous fish (Chondrichthyes), $Exocoetus$ is a bony fish (Osteichthyes), and $Branchiostoma$ is a cephalochordate.

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Petromyzon is a connecting link between

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