The World Record of ‘smallest seahorse’ has been achieved by the Satomi’s pygmy seahorse (Hippocampus satomiae) from Derawan Islands of Kalimantan.

Satomi’s pygmy seahorse is the smallest known seahorse in the world with an average length of 13.8 millimetres (0.54 in) and an height of 11.5 millimetres (0.45 in).