Literature
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- Kirkegaard, J.B. 1996. Havbørsteorme II. Danmarks Fauna, 86: 1-451.
- Maciolek, N. J. 1990. A redescription of some species belonging to the genera Spio and Microspio (Polychaeta: Annelida). Journal of Natural History, 24: 1109-1141.
- Rasmussen, E. 1973. Systematics an Ecology of the Isefjord Marine Fauna (Denmark). Ophelia, 11: 1-482.