Bastilla nielseni is a moth of the family Noctuidae first described by Jeremy Daniel Holloway and Scott E. Miller in 2003.Holloway, J. D. & Miller, Scott E. (2003). "The composition, generic placement and host-plant relationships of the joviana-group in the Parallelia generic complex" . Invertebrate Systematics. 17: 111–128. It is found in New Guinea, Kei Island, Halmahera, north Queensland, the Bismarck Islands and the Solomon Islands.
The length of the forewings is .
The larvae feed on Breynia cernua.
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