An inhalant opening on the head connects the exterior portion of the horizontal membrane between the dorsal and ventral chambers.

Cranchia scabra are distributed across the globe in tropical and subtropical open ocean waters.

Paralarval and juvenile squids are found in the epipelagic to upper mesopelagic zones of the ocean.

[7] C. scabra are neutrally buoyant animals due to ammonia fluid located in their cavities.

In captivity, C. scabra has been shown to contract its mantle which caused rapid backward movements over a distance of 3-4 body-lengths.

The exact function of this behavior is unknown, but inking could help them change color or may be used as a chemical weapon against predators.

Fertilization occurs within this mantle cavity and embryos hatch into a planktonic stage prior to growing to their adult size.

Statoliths are calcareous structures found in cephalopods which detect body accelerations throughout movement.

Researchers hypothesize that the translucent peripheral zones in C. scabra statoliths develop later, after the transition to deep water.