Sepiadarium gracilis is a species of cephalopod native to the Indo-Pacific; it occurs in the South China Sea and off the western Philippines.Reid, A. 2005. Family Sepiadariidae. In: P. Jereb & C.F.E. Roper, eds. Cephalopods of the world. An annotated and illustrated catalogue of species known to date. Volume 1. Chambered nautiluses and sepioids (Nautilidae, Sepiidae, Sepiolidae, Sepiadariidae, Idiosepiidae and Spirulidae). FAO Species Catalogue for Fishery Purposes. No. 4, Vol. 1. Rome, FAO. pp. 204–207.
The type specimen was collected in Philippine waters and is deposited at the National Museum of Natural History in Washington, D.C.
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