The cuttlebone is elongate oval, about twice as long as broad. There is a long, pointed spine present, and v-shaped striations.
Sepia opipara has a known depth range from 83 to 184 metres.
The Magnificent Cuttlefish is found in Southern Indo-Pacific waters; from Shark Bay, Western Australia around to southern Queensland.
- Lu, C.C (1998) A Synopsis of Sepiidae in Australian waters (Cephalopoda: Sepiodiea). In: Voss, N.A., Vecchione, M., Toll, R.B. & Sweeney, M.J (Eds) Systematics and Biogeography of Cephalopods. Smithsonian Institution Press, Washington DC, Vol. 586, 159-190.