Ascetta primordialis Haeckel, 1872 accepted as Clathrina primordialis (Haeckel, 1872) (additional source)
Chalina limbata (Montagu, 1814) accepted as Chalinula limbata (Montagu, 1814) (additional source)
Chalina oculata (Linnaeus, 1759) accepted as Haliclona (Haliclona) oculata (Linnaeus, 1759) (additional source)
Cliona celata Grant, 1826 (additional source)
Desmacidon fucorum (Esper, 1794) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Dysidea fragilis (Montagu, 1814) (additional source)
Ecionemia ponderosa Bowerbank, 1866 accepted as Stryphnus ponderosus (Bowerbank, 1866) (additional source)
Halichondria panicea (Pallas, 1766) represented as Halichondria (Halichondria) panicea (Pallas, 1766) (additional source)
Halisarca dujardinii Johnston, 1842 (additional source)
Pachymatisma johnstonia (Bowerbank in Johnston, 1842) (additional source)
Polymastia mamillaris (Müller, 1806) (additional source)
Polymastia robusta Bowerbank, 1862 accepted as Polymastia boletiformis (Lamarck, 1815) (additional source)
Raspailia stelligera Schmidt, 1862 accepted as Stelligera stuposa (Ellis & Solander, 1786) (additional source)
Raspailia viminalis Schmidt, 1862 represented as Raspailia (Raspailia) viminalis Schmidt, 1862 (additional source)
Reniera fistulosa (Bowerbank, 1866) accepted as Haliclona (Halichoclona) fistulosa (Bowerbank, 1866) (additional source)
Reniera semitubulosa (Lamarck, 1814) accepted as Halichondria (Halichondria) semitubulosa (Lamarck, 1814) (additional source)
Reniera varians (Bowerbank, 1866) accepted as Haliclona (Reniera) cinerea (Grant, 1826) (source of synonymy)
Seiriola Hanitsch, 1889 accepted as Stryphnus Sollas, 1886 (original description)
Seiriola compacta Hanitsch, 1889 accepted as Stryphnus ponderosus (Bowerbank, 1866) (original description)
Suberites suberea accepted as Suberites suberia (Montagu, 1814) (additional source)
Sycandra ciliata (Fabricius, 1780) accepted as Sycon ciliatum (Fabricius, 1780) (additional source)
Sycandra compressa (Fabricius, 1780) accepted as Grantia compressa (Fabricius, 1780) (additional source)
Tethya lyncurium (Linnaeus, 1767) accepted as Tethya aurantium (Pallas, 1766) (additional source)

Celtic Seas for Ascetta primordialis Haeckel, 1872 
Celtic Seas for Chalina limbata (Montagu, 1814) 
Celtic Seas for Chalina oculata (Linnaeus, 1759) 
Celtic Seas for Cliona celata Grant, 1826 
Celtic Seas for Desmacidon fucorum (Esper, 1794) 
Celtic Seas for Dysidea fragilis (Montagu, 1814) 
Celtic Seas for Ecionemia ponderosa Bowerbank, 1866 
Celtic Seas for Halichondria panicea (Pallas, 1766) 
Celtic Seas for Halisarca dujardinii Johnston, 1842 
Celtic Seas for Pachymatisma johnstonia (Bowerbank in Johnston, 1842) 
Celtic Seas for Polymastia mamillaris (Müller, 1806)  (inaccurate)
Celtic Seas for Polymastia robusta Bowerbank, 1862 
Celtic Seas for Raspailia stelligera Schmidt, 1862 
Celtic Seas for Raspailia viminalis Schmidt, 1862 
Celtic Seas for Reniera fistulosa (Bowerbank, 1866) 
Celtic Seas for Reniera semitubulosa (Lamarck, 1814) 
Celtic Seas for Reniera varians (Bowerbank, 1866) 
Celtic Seas for Seiriola compacta Hanitsch, 1889 
Celtic Seas for Suberites suberea 
Celtic Seas for Sycandra ciliata (Fabricius, 1780) 
Celtic Seas for Sycandra compressa (Fabricius, 1780) 
Celtic Seas for Tethya lyncurium (Linnaeus, 1767)