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(1998) Zoological Record Boardman et al. (1987) Fossil Invertebrates Systema Naturae 2000 Brusca & Brusca (1990) Invertebrates Cavalier-Smith (1998) A revised six-kingdom system of life Costello et al. (2001) European Register of Marine Species Finks et al. (2004) Volume 3: Porifera (Demospongea, Hexactinellida, Heteractinida, Calcarea) Grzimek (1973-1975) Het Leven der Dieren Hooper & van Soest (2002) Systema Porifera. A Guide to the Classification of Sponges Margulis & Schwartz (1982) Five Kingdoms Nielsen (1995) Animal Evolution Parker (1982) Synopsis and Classification of Living Organisms Ruggiero et al. (2015b) Correction: A Higher Level Classification of All Living Organisms Ruppert et al. (2004) Invertebrate Zoology Schopf & Klein (1992) The Proterozoic Biosphere: a multidisciplinary study Sepkoski (2002) A Compendium of Fossil Marine Animal Genera Storer et al. (1979) General Zoology Webby (2015) Outline Classification and Ranges of Taxa of the Hypercalcified Porifera Zhang (2011) Animal biodiversity

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Last updated: 28 Aug 2026