Which of the following feature is not applicable to the organism shown in the figure?

Step-by-step solution

The diagram represents the class Cyclostomata. The body is elongated, eel-like with median fins and cartilaginous fin ray. The paired appendages are absent, tail is diphycercal. Skin is soft, smooth and containing unicellular mucous glands, but no scales are present. Notochord persists throughout life. Imperfect neural arches over notochord represent rudimentary vertebrae. The mouth is ventral, suctorial and circular with denticles. In lateral sac-like pouches of the pharynx, 5-16 pairs of gills are present, while