Parilimyidae (parilimyas)
Patellidae (limpets)
Pectinidae – Chlamydinae (scallops)
Pectinidae – Pectininae (scallops)
Periplomatidae (rounded lantern-shells)
Petricolidae (crypt-dwellers)
Phallomedusidae (air-breathers)
Phasianellidae – Gabrieloninae (pheasant-shells)
Phasianellidae – Phasianellinae (pheasant-shells)
Phasianellidae – Tricoliinae (pheasant-shells)
Phenacolepadidae (false-limpets)
Philinidae (bubble-shells)
Philobryidae (micromussels)
Pholadidae – Pholadinae (angel-wings)
Pholidoteuthidae (squid)
Pinnidae (pen-shells)
Planaxidae – Fossarinae (larinopses)
Planaxidae – Planaxinae (clusterwinks)
Plesiotrochidae (monk-shells)
Pleurobranchidae – Pleurobranchaeinae (sea-slugs)
Pleurobranchidae – Pleurobranchinae (sea-slugs)
Polyceridae – Nembrothinae (sea-slugs)
Polyceridae – Polycerinae (sea-slugs)
Polyceridae – Triophinae (sea-slugs)
Pomatiopsidae – Pomatiopsinae (coxiellas)
Poromyidae – Poromyinae (spoon-shells)
Proctonotidae (sea-slugs)
Propeamussiidae (scallops)
Psammobiidae (sunset-shells)
Pseudolividae – Pseudolivinae (false-olives)
Pteriidae (butterfly-shells)
Pterotracheidae (sea-elephants)
Pyramidellidae – Cyclostremellinae (pyramid-shells)
Pyramidellidae – Odostomiinae (pyramid-shells)
Pyramidellidae – Pyramidellinae (pyramid-shells)
Pyramidellidae – Syrnolinae (pyramid-shells)
Pyramidellidae – Turbonillinae (pyramid-shells)
Pyramidellidae – Unplaced (pyramid-shells)
Pyroteuthidae (squid)