Pachaxinella subdola – synonym of Axinella subdola
Pachychalina excelsa – synonym of Isodictya palmata
Pachychalina grantii – synonym of Haliclona oculata
Pachychalina limbata – synonym of Acervochalina limbata
Pachymatisma normani – synonym of Pachymatisma johnstonia
Paresperia intermedia – synonym of Clathria intermedia
Pellina bibula – synonym of Halichondria panicea
Phacellia ventilabrum – synonym of Phakellia ventilabrum
Phakellia arctica – synonym of Axinella arctica
Phakellia infundibuliformis – synonym of Axinella infundibuliformis
Phakellia rugosa – synonym of Axinella rugosa
Phakellia simplicima – synonym of Bubaris vermiculata
Phakellia vermiculata – synonym of Bubaris vermiculata
Phakettia cribrosa – synonym of Stylissa cribrosa
Phloeodictyon isodictyiforme – synonym of Oceanapia isodictyiformis
Physcaphora decorticans – synonym of Placospongia decorticans
Pilochrota lactea – synonym of Stelletta lactea
Pione corallinoides – synonym of Cliona vastifica
Pione vastifica – synonym of Cliona vastifica
Placochalina infundibuliformis – synonym of Axinella infundibuliformis
Placomia ambigua – synonym of Plocamionida ambigua
Plocamia ambigua – synonym of Plocamionida ambigua
Plocamia coriacea – synonym of Antho coriacea
Plocamia erecta – synonym of Antho erecta
Plocamia inconstans – synonym of Antho inconstans
Plocamia microcionides – synonym of Phorbas neptuni
Plocamiancora spec. – synonym of Rotuloplocamia octoradiata
Plocamilla circonflexa – synonym of Antho circonflexa
Plocamilla coriacea – synonym of Antho coriacea
Plocamionida microcionides – synonym of Phorbas neptuni
Plumohalichondria atrasanguinea – synonym of Clathria atrasanguinea
Plumohalichondria fictitia – synonym of Phorbas fictitius
Plumohalichondria microcionides – synonym of Phorbas neptuni
Plumohalichondria neptuni – synonym of Phorbas neptuni
Plumohalichondria plumosa – synonym of Phorbas plumosus
Pocillon hyndmani – synonym of Iophon hyndmani
Pocillon implicita – synonym of Iophon hyndmani
Pocillon spinulentum – synonym of Iophon hyndmani
Polymastia brevis – synonym of Quasillina brevis
Polymastia bulbosa – synonym of Polymastia inflata
Polymastia capitata – synonym of Sphaerotylus schoenus
Polymastia gleneni – synonym of Aaptos papillata
Polymastia haemisphaericum – synonym of Trichostemma hemisphaericum
Polymastia mammeata – synonym of Hymeniacidon perlevis
Polymastia penicillus – synonym of Polymastia grimaldi
Polymastia schoenus – synonym of Sphaerotylus schoenus
Pronax dives – synonym of Phorbas dives
Pronax lieberkühni – synonym of Phorbas lieberkuehni
Pronax lobata – synonym of Cliona lobata
Pronax plumosa – synonym of Phorbas plumosus
Pronax plumosum – synonym of Phorbas plumosus
Pronaxella plumosa – synonym of Phorbas plumosus
Prosuberites longispina – synonym of Prosuberites longispinus
Pseudaxinella sulcata – synonym of Axinella rugosa
Pseudaxinyssa digitata – synonym of Axinyssa digitata
Pytheas digitifera – synonym of Crella digitifera
Pytheas fusifera – synonym of Crella fusifera