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Vacelet, J. (2002). Recent 'Sphinctozoa', Order Verticillida, Family Verticililidae Steinmann, 1882. Pp. 1097-1098. In: Hooper, J.N.A. & Van Soest, R.W.M.(eds) Systema Porifera - A Guide to the Classification of Sponges (2 volumes). Kluwer Academic/Plenum, NY, 1708+ XLVIII. ISBN 0-36-47260-0 (printed version).
Vacelet, J. (2002). Recent 'Sphinctozoa', Order Verticillida, Family Verticililidae Steinmann, 1882. Pp. 1097-1098. In: Hooper, J.N.A. & Van Soest, R.W.M.(eds) Systema Porifera - A Guide to the Classification of Sponges (2 volumes). Kluwer Academic/Plenum, NY, 1708+ XLVIII. ISBN 0-36-47260-0 (printed version).
