Pac
- Pachos
- Pachycheles
- Pachychelium
- Pachydillo
- Pachygrapsus
- Pachylasma
- Pachylasmatidae
- Pachylasmatidae
- Pachynus
- Pachypygus
- Pachystylis
- Pacifacanthomysis
- Pacifastacus
- Pacificabathynella
- Pacifoculodes
- Paciforchestia
- Pacroscia
Pad
- Padrycheles
Pae
- Paeduma
- Paeon
- Paeonocanthus
- Paeonodes
Pag
- Pagana
- Pagina
- Pagonana
- Pagurapseudes
- Pagurapseudidae
- Pagurapseudopsididae
- Pagurapseudopsis
- Paguridae
- Pagurion
- Pagurisaea
- Paguristes
- Paguritherium
- Pagurixus
- Pagurocryptella
- Pagurodes
- Pagurodofleinia
- Paguroidea
- Pagurojacquesia
- Pagurolepas
- Paguropsis
- Pagurotanais
- Pagurus
Pai
- Paivella
Pak
- Pakistanapseudes
Pal
- Palabriaphoxus
- Palaemon
- Palaemonella
- Palaemonellione
- Palaemonetes
- Palaemonias
- Palaemonidae
- Palaemonoidea
- Palaeocopida
- Palaeocopida
- Palaeotanais
- Palaioscia
- Palanana
- Palapedia
- Palatigum
- Palaumysis
- Palibythus
- Palicidae
- Palicoidea
- Palicoides
- Paliculus
- Palicus
- Palinnotus
- Palinurellus
- Palinuridae
- Palinuroidea
- Palinurus
- Palinustus
- Palmenella
- Palmoconcha
- Palmyria
Pan
- Panathura
- Panchaia
- Pancoloides
- Pancolus
- Pandalidae
- Pandalina
- Pandaloidea
- Pandalopsis
- Pandalus
- Pandaridae
- Pandaridae
- Pandarus
- Panetela
- Panningillo
- Pannosus
Porodica Panopeidae Ortmann, 1893
- Eucratopsinae Stimpson, 1871 ; nije prihvaćeno
- Chasmophora Rathbun, 1914
- Cycloplax Guinot, 1969
- Cyrtoplax Rathbun, 1914
- Eucratopsis Smith, 1869
- Glyptoplax Smith, 1870
- Homoioplax Rathbun, 1914
- Malacoplax Guinot, 1969
- Odontoplax Garth, 1986
- Panoplax Stimpson, 1871
- Prionoplax H. Milne Edwards, 1852
- Robertsella Guinot, 1969
- Tetraplax Rathbun, 1901
- Thalassoplax Guinot, 1969
- Panopeinae Ortmann, 1893
Crustacea → Malacostraca → Decapoda → Heterotremata → Xanthoidea
Potporodica Panopeinae Ortmann, 1893
- Acantholobulus Felder & Martin, 2003
- Dyspanopeus Martin & Abele, 1986
- Eurypanopeus A. Milne-Edwards, 1880
- Eurytium Stimpson, 1859
- Hexapanopeus Rathbun, 1898
- Lophopanopeus Rathbun, 1898
- Lophoxanthus A. Milne-Edwards, 1879
- Metopocarcinus Stimpson, 1860
- Neopanope A. Milne-Edwards, 1880
- Panopeus H. Milne Edwards, 1834
- Rhithropanopeus Rathbun, 1898
- Tetraxanthus Rathbun, 1898
Crustacea → Malacostraca → Decapoda → Heterotremata → Xanthoidea → Panopeidae
- Panopeus
- Panoplax
- Panoploea
- Pantomus
- Panulirus
Pap
- Papuadillo
- Papuaphiloscia
- Papuasoniscus
Par
- Parabathynellidae
- Parabathynomus
- Parabetaeus
- Parabogidiella
- Parabopyrella
- Parabopyriscus
- Parabopyrus
- Parabradyidius
- Paracalanidae
- Paracalanidae
- Paracalanus
- Paracalliax
- Paracalliope
- Paracalliopiella
- Paracalliopiidae
- Paracallisoma
- Paracallisomopsis
- Paracamptus
- Paracampylaspis
- Paracandona
- Paracanthomysis
- Paracaprella
- Paracaridina
Paracassidina Baker, 1911
- Paracassidina anasilla Bruce, 1994
- Paracassidina bakeri Bruce, 1994
- Paracassidina bamarook Bruce, 1994
- Paracassidina bilbie Bruce, 1994
- Paracassidina cervina Bruce, 1994
- Paracassidina dama Bruce, 1994
- Paracassidina fuscina Bruce, 1994
- Paracassidina incompta Bruce, 1994
- Paracassidina kutyo Bruce, 1994
- Paracassidina munna Bruce, 1994
- Paracassidina pectinata Baker, 1911
- Paracassidina petala Bruce, 1994
- Paracassidina prolata Bruce, 1994
- Paracassidina wurrook Bruce, 1994
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
Paracassidinopsis Nobili, 1906
- Paracassidinopsis perlata (Roman, 1974)
- Paracassidinopsis sculpta Nobili, 1906
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
- Paracentromedon
- Paracepon
Paracerceis Hansen, 1905
- Paracerceis caudata (Say, 1818)
- Paracerceis cohenae Kensley, 1984
- Paracerceis cordata (Richardson, 1899)
- Paracerceis dollfusi Lombardo, 1985
- Paracerceis edithae Boone, 1930
- Paracerceis gilliana (Richardson, 1899)
- Paracerceis glynni Kensley, 1984
- Paracerceis holdichi Kussakin & Malyutina, 1993
- Paracerceis nuttingi (Boone, 1921)
- Paracerceis richardsonae Lombardo, 1988
- Paracerceis sculpta (Holmes, 1904)
- Paracerceis spinulosa Espinosa-Perez & Hendrickx, 2002
- Paracerceis tomentosa Schultz & McCloskey, 1967
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
- Paracercopidae
Paracercops Vassilenko, 1972
- Paracercops setifer Vassilenko, 1972
Crustacea → Malacostraca → Amphipoda → Caprellidira → Caprelloidea → Caprellidae → Paracercopinae
- Paracerviniella
- Parachaetophiloscia
- Paracharon
- Parachiridotea
Paracilicaea Stebbing, 1910
- Paracilicaea asiatica Kussakin, Malyutina & Rostomov, 1990
- Paracilicaea aspera Harrison & Holdich, 1984
- Paracilicaea clavus Barnard, 1955
- Paracilicaea cordylina Kensley, 1984
- Paracilicaea eupyga (Nobili, 1906)
- Paracilicaea falcata Benvenuti & Messana, 2000
- Paracilicaea fimbriata Kussakin, Malyutina & Rostomov, 1990
- Paracilicaea flexilis Baker, 1928
- Paracilicaea gigas Baker, 1928
- Paracilicaea hanseni Stebbing, 1910
- Paracilicaea keijii Javed, 1990
- Paracilicaea mirabilis Benvenuti & Messana, 2000
- Paracilicaea mossambica Barnard, 1914
- Paracilicaea nodosa Benvenuti & Messana, 2000
- Paracilicaea peniculata Benvenuti & Messana, 2000
- Paracilicaea pubescens (H. Milne Edwards, 1840)
- Paracilicaea setosa Müller, 1995
- Paracilicaea stauros Schotte & Kensley, 2005
- Paracilicaea stebbingi Baker, 1926
- Paracilicaea teretron Barnard, 1955
- Paracilicaea uncinata Benvenuti & Messana, 2000
- Paracilicaea watamuae Müller, 1995
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
- Paracleistostoma
- Paraclimenaeus
- Paraclimene
- Paracobanocythere
- Paracomantenna
- Paraconcavus
- Paraconchoecia
- Paracorophium
- Paracrangon
- Paracrangonyctidae
- Paracrangonyx
- Paracrenhydrosoma
- Paractaea
- Paractaeopsis
- Paracyclois
- Paracyclops
- Paracymothoa
- Paracyphocaris
- Paracyphoniscus
- Paracyprideis
- Paracyprididae
- Paracyprididae
- Paracypridina
- Paracypris
- Paracyproidea
- Paracytheridea
- Paracytherideidae
- Paracytherideidae
- Paracytherois
- Paracytheroma
- Paradactylopodia
- Paradanielssenia
- Paradasygyius
Paradella Harrison & Holdich, 1982
- Paradella acutitelson (Menzies & Glynn, 1968)
- Paradella bakeri (Menzies, 1962)
- Paradella dianae (Menzies, 1962)
- Paradella garsonorum Wetzer & Bruce, 2007
- Paradella harrisoni Müller, 1995
- Paradella heptaphymata Shoukr, Mona & Rizk, 1987
- Paradella octaphymata Harrison & Holdich, 1982
- Paradella plicatura (Glynn, 1970)
- Paradella quadripunctata (Menzies & Glynn, 1968)
- Paradella setosa (Glynn, 1968)
- Paradella tiffany Bruce & Wetzer, 2004
- Paradella tomleklek Storey, 2002
- Paradella tuberculata Müller, 1991
- Paradella tumidicauda (Glynn, 1970)
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
- Paradesmosoma
- Paradexamine
- Paradiastylis
- Paradicoides
- Paradoniscus
- Paradorippe
- Paradoryphallophora
- Paradoxapseudes
- Paradoxostoma
- Paradoxostomatidae
- Paradoxostomatidae
- Paradromia
- Paradryope
- Paradulichia
- Paradusa
- Paradynomene
- Paraentomonyx
- Paraergasilus
- Paraeuchaeta
- Parafilitanais
- Paragalene
- Paragathotanais
- Paragebicula
- Paragigantione
- Paragiopagurus
- Paragnathia
- Paragoneplax
- Paragrapsus
- Paragrubia
- Paraguascia
- Parahalice
- Parahaustorius
- Parahelice
- Parahepomadus
- Paraheterorhabdus
- Parahexapus
- Paraidya
Paraimene Javed & Ahmed, 1988
- Paraimene charlesae Kensley & Schotte, 1994
- Paraimene danieli Ortiz, Winfield & Cházaro-Olvera, 2012
- Paraimene ibarzabalae Kensley, Ortiz & Schotte, 1997
- Paraimene tuberculata Javed & Ahmed, 1988
- Paraimene tumulus Kensley, Ortiz & Schotte, 1997
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
- Paraiungentitanais
- Parajassa
- Parajoubinella
- Parakermania
- Parakonarus
- Parakozhowia
- Parakrithella
- Paralafystius
- Paralamprops
- Paralanceola
- Paralaophonte
- Paralbunea
- Paralebion
- Paraleiopus
- Paralepas
- Paraleptamphopiidae
- Paraleptamphopus
- Paraleptastacus
- Paraleptognathia
- Paraleptomesochra
- Paraleptomysis
- Paraleptopsyllus
Paraleptosphaeroma Buss & Iverson, 1981
- Paraleptosphaeroma brucei Kussakin & Malyutina, 1993
- Paraleptosphaeroma glynni Buss & Iverson, 1981
- Paraleptosphaeroma indica Mueller, 1990
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
- Paraleptostylis
- Paraleucon
- Paraleucothoe
- Paralibrotus
- Paralicella
Paralimnetis Gurney, 1931
- Paralimnetis mapimi Maeda-Martinez, 1987
- Paralimnetis rapax Gurney, 1931
- Paralimnetis texana Martin and Belk, 1988
Crustacea → Branchiopoda → Phyllopoda → Diplostraca → Lynceidae
- Paralimnocythere
- Paralimnoria
Paralimopsis Moosa, 1991
- Paralimopsis carinata Moosa, 1991
- Paralimopsis paulocarinata (Blumstein, 1972)
Crustacea → Malacostraca → Stomatopoda → Squilloidea → Squillidae
- Paraliomera
- Paralithodes
- Parallorchestes
- Paralomis
- Paralona
- Paralophogaster
- Paralycaea
- Parambasia
- Paramblyops
- Paramedaeus
- Parameiropsis
- Paramekodon
- Paramenophia
- Paramesochra
- Paramesochridae
- Paramesochridae
- Paramesogammarus
- Paramesopodopsis
- Parametaphoxus
- Parametopa
- Parametopella
- Paramexiweckelia
- Paramicrodeutopus
- Paramisophria
- Paramithrax
- Paramoera
- Paramollicia
- Paramphiascella
- Paramphiascopsis
- Paramphilochoides
- Paramphisopus
- Paramphithoe
- Parampithoe
- Paramunida
- Paramunna
- Paramunnidae
- Paramunnopsis
- Paramysis
- Paranamixis
- Paranannopus
- Paranarthrura
- Paranarthrurella
- Paranaxia
- Paranchialina
- Paranchistu
- Paranchistus
- Parandania
- Parandaniexis
- Paranebalia
- Paranebaliidae
- Paranephrops
- Paranesidea
- Paranesotanais
- Paranotoniscus
- Paranotonyx
- Paranthura
- Paranthuridae
- Paranursia
- Parapacroscia
- Parapagurapseudopsis
- Parapaguridae
- Parapagurion
- Parapagurodes
- Parapagurus
- Parapalicus
- Parapallasea
Potporodica Parapallaseinae Kamaltynov, 1999
- Ceratogammarus Sowinsky, 1915
- Palicarinus Barnard & Barnard, 1983
- Parapallasea Stebbing, 1899
Crustacea → Malacostraca → Amphipoda → Gammaroidea → Acanthogammaridae
- Parapandalus
- Parapanope
- Parapasiphae
- Parapenaeon
- Parapenaeonella
- Parapenaeopsis
- Parapenaeus
- Paraperiscyphops
- Parapetalophthalmus
- Parapetalus
- Parapetrolisthes
- Parapherusa
- Paraphiloscia
- Paraphotis
- Paraphoxus
- Paraphreatoicus
- Paraphronima
- Paraphronimidae
- Parapilumnus
- Parapinnixa
- Parapleurocrypta
- Parapleurocryptella
- Parapleurophrycoides
- Parapleustes
- Parapodascon
- Parapontella
- Parapontellidae
- Parapontellidae
- Parapontocaris
- Parapontonia
- Parapontoparta
- Parapotamon
- Parapotamonoides
- Parapronoe
- Paraprotella
- Parapseudes
- Parapseudidae
- Parapseudione
- Parapseudoleptomesochra
- Parapseudomma
- Parapseudotanais
- Parapylocheles
- Parapyxidognathus
- Pararanguna
- Pararchinotodelphys
- Parargeia
- Parargestes
- Parargissa
- Pararobertsonia
- Parartemia
- Parartemiidae
- Parasarsiella
- Parascelidae
- Parascelus
- Paraschizidium
- Paraschizopera
- Parascothorax
- Parascytoleptus
- Paraselwynia
Paraserolis Wägele, 1994
- Paraserolis polita (Pfeffer, 1887)
Crustacea → Malacostraca → Isopoda → Sphaeromatidea → Seroloidea → Serolidae
- Parasesarma
- Parasinelobus
Parasphaeroma Stebbing, 1902
- Parasphaeroma prominens Stebbing, 1902
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
- Paraspidophryxus
- Parasquilla
- Parasquillidae
- Parasquilloidea
- Parastacidae
- Parastacilla
- Parastacoidea
- Parastacus
- Parastenasellus
- Parastenhelia
- Parastenheliidae
- Parastenheliidae
- Parastenocarididae
- Parastenocarididae
- Parastenocaris
- Parastephos
- Parasterope
- Parastilomysis
- Parasymmerus
- Parasymmetrione
- Parasymmetrorbione
- Paratanaidae
- Paratanais
- Paratanaoidea
- Parategastes
- Paratelphusula
- Paratergatis
- Parathalestris
- Parathaumatelson
- Parathelges
- Parathelphusa
- Parathemisto
- Parathranites
- Paratigriopus
- Paratoradjia
- Paratryphosites
Paratya Miers, 1882
- Paratya annamensis Balss, 1924
- Paratya australiensis Kemp, 1917
- Paratya boninensis Satake & Cai, 2005
- Paratya borealis Volk, 1938
- Paratya bouvieri Roux, 1926
- Paratya caledonica Roux, 1926
- Paratya compressa (De Haan, 1844 [in De Haan, 1833-1850])
- Paratya curvirostris (Heller, 1862)
- Paratya howensis Roux, 1926
- Paratya improvisa Kemp, 1917
- Paratya intermedia Roux, 1926
- Paratya martensi Roux, 1925
- Paratya norfolkensis Kemp, 1917
- Paratya typa Roux, 1926
Crustacea → Malacostraca → Decapoda → Caridea → Atyoidea → Atyidae
- Paratylodiplax
- Paratymolus
- Paratyphis
- Paratyphlotanais
Paratypton Balss, 1914
- Paratypton siebenrocki Balss, 1914
Crustacea → Malacostraca → Decapoda → Palaemonoidea → Palaemonidae → Pontoniinae
- Paraugaptiloides
- Paraugaptilus
- Paravaunthompsonia
- Paravijaya
- Paravireia
- Parawaldeckia
- Paraxanthias
- Paraxanthodes
- Paraxanthus
- Paraxenodillo
- Paraxiopsis
- Paraxius
- Parcylisticus
- Pardalisca
- Pardaliscella
- Pardaliscidae
- Pardaliscoides
- Pardisynopia
- Parelasmopus
- Parelumoides
- Parepactophanes
- Parerythrops
- Parethusa
- Paretisus
- Pareucalanus
- Pareurystheus
- Pareusirogenes
- Parevansula
- Parhaustorioides
- Parhippolyte
- Parhyale
- Parhyalella
- Parialysus
- Pariambidae
- Pariambus
- Paridotea
- Parilcirolana
- Parilia
- Parione
- Parionella
- Parionina
- Parioninella
- Pariphiculus
- Pariphinotus
- Parischioscia
Parisocladus Barnard, 1914
- Parisocladus perforatus (H. Milne Edwards, 1840)
- Parisocladus stimpsoni (Heller, 1861)
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
- Parmulodes
- Paroediceroides
- Paroediceros
- Paroithona
- Paromola
- Paronesimus
- Paronychocamptus
- Parophiopsyllus
- Parophryoxus
- Paropsurus
- Parorchestia
- Parribacus
- Parthenope
- Parthenopea
- Parthenopidae
- Parthenopoidea
- Parthenopoides
- Parundinella
- Parvalona
- Parvimysis
Parvisquilla Manning, 1973
- Parvisquilla dominguez Ahyong & Erdmann, 2003
- Parvisquilla multituberculata (Borradaile, 1898)
- Parvisquilla sinuosa (Edmondson, 1921)
Crustacea → Malacostraca → Stomatopoda → Squilloidea → Squillidae
- Parvocalanus
- Parvocythere
- Parvocytheridae
- Parvocytheridae
- Parvuspotamon
Pas
- Pasiphaea
- Pasiphaeidae
- Pasiphaeoidea
- Pasterope
- Pastilla
Pat
- Patagonacythere
- Patuki
- Patulambrus
Pau
- Pauperella
Pav
- Pavlovskeola
Pax
Paxodillidium Schmalfuss, 1985
- Paxodillidium schawalleri Schmalfuss, 1985
Crustacea → Malacostraca → Isopoda → Oniscidea → Armadillidiidae