[5] Phylogenomic analyses have shown that species in the family Idiosepiidae are sister to all other Decapodiformes.

The mantle is elongate, obovate to cigar-shaped, with its posterior margin bluntly pointed at the distal tip.

Their internal chitinous shell is vestigial, and the dorsal surface of the mantle has a unique oval adhesive organ, which secretes a sticky substance and is used to attach itself to seaweed or seagrass blades.

[3] Females are generally larger and achieve sexual maturity later than males.

[8] Idiosepiidae have an Indo-west Pacific distribution, from South Africa in the west to Japan and Russia in the east.