Holoplankton spend their whole life in the pelagic as part of the plankton community. Although most holoplankton are small in size, they can reach centimeters in size, as in the case of the true jellyfishes.
Cnidaria
Polychaeta
Ctenophore
Classification: Cnidaria (Phylum) > Hydrozoa (Class) Hydromedusae
Classification: Cnidaria (Phylum) > Scyphozoa (Class) > Discomedusae (Subclass) > Semaeostomeae (Order) > Pelagiidae (Family) > Chrysaora (Genus) Ephyra stage
Classification: Cnidaria (Phylum) > Hydrozoa (Class) > Hydroidolina (Subclass) > Siphonophorae (Order) > Calycophorae (Suborder) > Diphyidae (Family) > Dyphyinae (Subfamily) > Diphyes (Genus) > Diphyes dispar (Species)
Classification: Cnidaria (Phylum) > Hydrozoa (Class) > Hydroidolina (Subclass) > Siphonophorae (Order) > Calycophorae (Suborder) > Diphyidae (Family) > Dyphyinae (Subfamily) > Diphyes (Genus) > Diphyes dispar (Species)
Ctenophora (Phylum) > Tentaculata (Class) > Cydippida (Order) > Pleurobrachiidae (Family) > Pleurobrachia (Genus)
Classification: Annelida (Phylum) > Polychaeta (Class) > Errantia (Subclass) > Phyllodocida (Order) > Phyllodocida incertae sedis (Suborder) > Tomopteridae (Family) > Tomopteris (Genus)
Copepoda
Classification: Arthropoda (Phylum) > Crustacea (Subphylum) > Multicrustacea (Superclass) > Hexanauplia (Class) > Copepoda (Subclass) > Neocopepoda (Infraclass) > Gymnoplea (Superorder) > Calanoidea (Order)
Classification: Arthropoda (Phylum) > Crustacea (Subphylum) > Multicrustacea (Superclass) > Hexanauplia (Class) > Copepoda (Subclass) > Neocopepoda (Infraclass) > Gymnoplea (Superorder) > Calanoidea (Order) > Euchaetidae (Family) > Echeata (Genus)
Classification: Arthropoda (Phylum) > Crustacea (Subphylum) > Multicrustacea (Superclass) > Hexanauplia (Class) > Copepoda (Subclass) > Neocopepoda (Infraclass) > Podoplea (Superorder) > Cyclopoida (Order) > Poecilostomatoida (Suborder) > Sapphirinidae (Family)
Classification: Arthropoda (Phylum) > Crustacea (Subphylum) > Multicrustacea (Superclass) > Hexanauplia (Class) > Copepoda (Subclass) > Neocopepoda (Infraclass) > Gymnoplea (Superorder) > Calanoidea (Order) > Pontellidae (Family) > Pontella (Genus)
Chaetognatha
Classification: Chaetognatha (Phylum) > Sagittoidea (Class) > Aphragmophora (Order) > Sagittidae (Family) > Flaccisagitta enflata (Species)
Branchiopoda
Classification: Arthropoda (Phylum) > Crustacea (Subphylum) > Branchiopoda (Class) > Phyllopoda (Subclass) > Diplostraca (Order) > Onychocaudata (Suborder) > Cladoceromorpha (Infraorder) > Cladocera (Infraorder) > Ctenopoda (Parvorder) > Sididae (Family) > Penilia (Genus)
Classification: Arthropoda (Phylum) > Crustacea (Subphylum) > Branchiopoda (Class) > Phyllopoda (Subclass) > Diplostraca (Order) > Onychocaudata (Suborder) > Cladoceromorpha (Infraorder) > Cladocera (Infraorder) > Gymnomera (Parvorder) > Onychopoda (Section) > Podonidae (Family) > Pseudevadne (Genus)
Amphipod
Athropoda (Phylum) > Crustacea (Subphylum) > Multicrustacea (Superclass) > Malacostraca (Class) > Eumalacostraca (Subclass) > Peracarida (Superorder) > Amphipoda (Order) > Hyperiidea (Suborder)
Ostracoda
Classification: Arthropoda (Phylum) > Crustacea (Subphylum) > Oligostraca (Superclass)> Ostracoda (Class)
Classification: Arthropoda (Phylum) > Crustacea (Subphylum) > Oligostraca (Superclass)> Ostracoda (Class)
Tunicata
Classification: Chordata (Phylum) > Tunicata (Subphylum) > Appendicularia (Class) > Copelata (Order) > Oikopleuridae (Family) > Oikopleurinae (Subfamily) > Labiata (Tribe) > Oikipleura (Genus)
Classification: Chordata (Phylum) > Tunicata (Subphylum) > Appendicularia (Class) > Copelata (Order) > Oikopleuridae (Family) > Oikopleurinae (Subfamily) > Labiata (Tribe) > Oikipleura (Genus)
Classification: Chordata (Phylum) > Tunicata (Subphylum) > Thaliacea (Class) > Doliolida (Order)
Classification: Chordata (Phylum) > Tunicata (Subphylum) > Thaliacea (Class) > Doliolida (Order) > Dolioletta gegenbauri (Species)
