(B) $Echeneis$ is commonly known as the sucker fish. Its upper surface bears a large,flat,oval adhesive disc or sucker. This sucker represents a modif

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(B) $Echeneis$ is commonly known as the sucker fish. Its upper surface bears a large,flat,oval adhesive disc or sucker. This sucker represents a modified anterior dorsal fin,which allows the fish to attach itself to larger marine animals like sharks or turtles for transport and protection.