[3] This species was first collected in South Australia by its namesake, William Lawrence Bragg.

[5]Sepia braggi is part of the subgenus Doratosepion which contains to 41 species of cuttlefish in total.

[11] Of the Sepia genus, S. braggi is only species that does not have a darkened lateral band on the upper and lower beak.

Also, on the upper beak, the fully darkened section is much smaller (2.6 mm) than other species of Sepia.

What separates Sepia braggi from all other species of cuttlefish are the short purple bars and blotches on the arms.

Sepia braggi is one of three species of cuttlefish known to inhabit Spencer Gulf in South Australia.

Similar to other cuttlefish species, S. braggi feeds on small crabs, other crustaceans and fish.