Sepia joubini is a species of cuttlefish native to the southwestern Indian Ocean, specifically South Africa, off Tugela River Mouth (-29.1833°N 56°W), to Cape Natal, off southern Mozambique (24ºS to 25ºS), and in the Saya-de-Malha Bank. It lives at a depth of between 66 and 170 m.[1]
Females of S. joubini grow to a mantle length of 64 mm.
The type specimen was collected off Durban, South Africa. It is deposited at The Natural History Museum in London.[2] The specific name honours Prof. Dr. Louis Marie Adolphe Olivier Édouard Joubin (1861-1935), a professor at the Muséum national d'Histoire naturelle in Paris and the species was named by the Irish zoologist Annie Massy.[3]