In the Gulf of Thailand off eastern Thailand Idiosepius thailandicus was recorded among seaweed in the littoral zone in Rayong Province  and in a mangrove habitats in Chanthaburi Province. In mangrove habitats the squid adhered their eggs to the roots of the mangrove.
Idiosepius thailandicus was discovered in the Gulf of Thailand off eastern Thailand among seaweed in the littoral zone in Rayong Province and in mangrove habitats in Chanthaburi Province. In mangrove areas, the squid affixed their eggs to the roots of the mangrove.