Guidetti, R. and Bertolani, R., 2005. Tardigrade taxonomy: an updated check list of the taxa and a list of characters for their identification. Zootaxa, issue 845: 1-46.
Schuster, R.O., Nelson, D.R., Grigarick, A.A., and Christenberry, D., 1980. Systematic Criteria of the Eutardigrada. Transactions of the American Microscopical Society, vol. 99, no. 3: 284-303.
