The structure of Cassiopeia andromeda’s body is radially symmetrical and can attain a diameter of up to 30 cm. The bell is relatively flat and disk-shaped, featuring a rounded edge. The color of the bell is yellowish-brown with white or pale spots and streaks. The marginal lappets are short, blunt, and vary in number. The mouth is divided into numerous small openings along the oral arms. There are eight oral arms that are brownish and adorned with extended, frilly tentacles.