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A large collection of clionaid sponges collected in 58 different localities from the Pacific coast of Mexico was studied, and 15 species belonging to four genera were identified. Six species are new to science: in the genus Cliona, C. papillae sp. nov. and C. vallartense sp. nov. ; in the genus Thoosa, T. calpulli sp. nov. and T. mismalolli sp. nov. ; and in the genus Spheciospongia, S. ruetzleri sp. nov. and S. incrustans sp. nov. The new combinations Cliona californiana comb. nov. and Cliona raromicrosclera comb. nov. are also proposed. Pseudosuberites pseudos is considered to be synonymous to Cliona californiana. In addition, the validity of Pione mazatlanensis is also considered. Other Cliona species identified are Cliona vermifera, Pione carpenteri ( as Cliona carpenteri), C. amplicavata, Cliona flavifodina, and Cliona euryphylla. Cliona amplicavata and C. flavifodina are recorded for the first time in the …