Cephaloscyllium circulopullum, known commonly as the Circle-blotch pygmy swell shark in Malaysia, is a species of catshark

Catshark

Catsharks are ground sharks of the family Scyliorhinidae, with over 150 known species. While they are generally known as catsharks, many species are commonly called dogfish....

 in the genus Cephaloscyllium

Cephaloscyllium

Cephaloscyllium is a genus of catshark, family Scyliorhinidae, commonly known as swellsharks because of their ability to inflate their body with water or air as a defense against predators. These sluggish, bottom-dwelling sharks are found widely in the tropical and temperate coastal waters of the...

. It is a tropical catshark found around Malaysia and Brunei Darussalam, in the western Pacific Ocean

Pacific Ocean

The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...

. It was named by K. Yano, A. Ahmed, A.C. Gambang, Hamid Idris, A. Razel Azan, and Zainal Aznan in 2005, and can reach a maximum length of 37.8 centimetres.