[3] The large headshield is wide in the front, narrowing slightly to form a rounded end.

[3] The chemosensory Hancock's organs are brown and form a thin wrinkled ridge in the areas between the foot and the headshield on each side of the head.

[6] Stretching from the west coast of the United States to the west coast of India, the Indo-Pacific is a 24-nation regional framework comprising the tropical waters of the Indian Ocean, the western and central Pacific Ocean, and the seas connecting the two in the general area of Indonesia.

[7] It lives at the same place on the shore as many limpets, and its compact shape and large muscular foot make it difficult to pry the animal off the rock at low tide.

[3] Most calyculata were discovered in low water near shores, attached onto various rocks and coral reefs.