The Sepia dubia were collected from False Bay in South Africa (a body of water in the Atlantic Ocean between the mountainous Cape Peninsula and the Hottentots Holland Mountains in the extreme south-west of South Africa) and deposited at The National History Museum in London.
The type specimen was collected in False Bay, South Africa (). It is deposited at The Natural History Museum in London. False Bay (Afrikaans Valsbaai) is a body of water in the Atlantic Ocean between the mountainous Cape Peninsula and the Hottentots Holland Mountains in the extreme south-west of South Africa. 
