P. Fontoura, G. Pilato, P. Morais, and O. Lisi, “Minibiotus xavieri, a new species of tardigrade from the Parque Biologico de Gaia, Portugal (Eutardigrada: Macrobiotidae)”, Zootaxa, vol. 2267, no. 1, pp. 55–64, Oct. 2009.