Dwarf Cuttlefish

Sepia bandensis, commonly known as the stumpy-spined cuttlefish or dwarf cuttlefish, is a smaller species of cuttlefish. Sepia baxteri and Sepia bartletti are possible synonyms. It reaches 7 centimeters in mantle length; males weigh about 40 grams, females 45 grams. (Wikipedia)

We encountered this individual at Bianca divesite, Lembeh. They can be found in most coastal regions of Southeast Asia though.