CreatureData

class

Hydrozoa

Hydrozoa is a class in the phylum Cnidaria. This database currently files 4,409 species under it, recorded across 3 countries.

Species filed
4,409
Threatened
0
Countries recorded
3
With a free photo
0%
Weight range
Not recorded

What is in Hydrozoa?

45 orders filed directly under this class.

  1. Leptothecata

    crystal jelly, sea fir, crystal jelly, podded hydroid …

    2,356 species
  2. Anthoathecata

    immortal jelly, little sail, green hydra, grey hydra …

    1,605 species
  3. Siphonophorae

    portuguese man o' war, giant siphonophore, string jelly, flying spaghetti monster …

    224 species
  4. Narcomedusae

    golf tee medusa, dinner plate medusa, dinner plate jelly, Aegina longicornis …

    77 species
  5. Trachymedusae

    pink helmet, american pipit, silky medusa, veiled medusa …

    64 species
  6. Limnomedusae

    angled hydromedusa, jewel jelly, trunked jellyfish, estuarine jelly …

    60 species
  7. Actinulida

    Halammohydra adhaerens, Halammohydra adherens, Halammohydra andamanensis, Halammohydra chauhani …

    18 species
  8. Lemniscaterina

    Cassianastraea plumosa, Cassianastraea reussi, Hydrosclera plumosa

    3 species
  9. Calycellidae

    Calycella gracilis

    1 species
  10. Thaumatostroma

    Thaumatostroma verrucosa

    1 species
  11. Acalepha

    0 species
  12. Archaeoantennularia

    0 species
  13. Archaeolafoea

    0 species
  14. Archaeonectris

    0 species
  15. Cambrohydra

    0 species
  16. Chondroplidae

    0 species
  17. Conchopeltidae

    0 species
  18. Cordubia

    0 species
  19. Crucimedusina

    0 species
  20. Cycloporidium

    0 species
  21. Delheidia

    0 species
  22. Diplosoma

    0 species
  23. Discophyllum

    0 species
  24. Eisenackiella

    0 species
  25. Eoaequorea

    0 species
  26. Globostroma

    0 species
  27. Graptogeitonia

    0 species
  28. Inocaulidae

    0 species
  29. Jillua

    0 species
  30. Kristinella

    0 species
  31. Kullingia

    0 species
  32. Likinia

    0 species
  33. Mazohydra

    0 species
  34. Mesokylix

    0 species
  35. Octocannoidae

    0 species
  36. Palaeacmaeidae

    0 species
  37. Palaelophacmaea

    0 species
  38. Philippinactinia

    0 species
  39. Pulemidae

    0 species
  40. Rhabdohydridae

    0 species
  41. Roseoporella

    0 species
  42. Sphaerostromella

    0 species
  43. Stoliczkaria

    0 species
  44. Stoliczkiella

    0 species
  45. Stromactinia

    0 species

Best-known members of Hydrozoa

Ranked by popularity score.

Grey hydra

Hydra oligactis

HydridaeNo free photo yet

Where is Hydrozoa found?

Species on file in this class listed for each country. Checklist listings, which are incomplete for many species; not range maps.

Sweden: 3 speciesTaiwan: 2 speciesDenmark: 1 species
  • None on record
  • 1
  • 2
  • 3
  • 4+
species per country · small islands are not drawn at this scale
  1. Sweden3
  2. Taiwan2
  3. Denmark1

The 200 best-known species in Hydrozoa

Of 4,409 on file. Open this list in the browser to filter and sort it

Common nameScientific nameFamilyStatusWeightCountries
Portuguese man o' warPhysalia physalisPhysaliidaeNot recordedNot recordedNot recorded
Immortal jellyTurritopsis dohrniiOceaniidaeNot recordedNot recordedNot recorded
Little sailVelella velellaPorpitidaeNot recordedNot recordedNot recorded
Crystal jellyAequorea victoriaAequoreidaeNot recordedNot recordedNot recorded
Green hydraHydra viridissimaHydridaeNot recordedNot recordedNot recorded
Grey hydraHydra oligactisHydridaeNot recordedNot recordedNot recorded
White hydraHydra vulgarisHydridaeNot recordedNot recordedNot recorded
Blue buttonPorpita porpitaPorpitidaeNot recordedNot recordedNot recorded
Fire coralMillepora dichotomaMilleporidaeNot recordedNot recordedNot recorded
Giant siphonophorePraya dubiaPrayidaeNot recordedNot recordedNot recorded
Fire coralMillepora alcicornisMilleporidaeNot recordedNot recordedNot recorded
Angled hydromedusaGonionemus vertensOlindiidaeNot recordedNot recordedNot recorded
Fire coralMillepora platyphyllaMilleporidaeNot recordedNot recordedNot recorded
Sea firSertularia argenteaSertulariidaeNot recordedNot recordedNot recorded
String jellyApolemia uvariaApolemiidaeNot recordedNot recordedNot recorded
Flying spaghetti monsterBathyphysa coniferaRhizophysidaeNot recordedNot recordedNot recorded
HydroidCordylophora caspiaCordylophoridaeNot recordedNot recordedNot recorded
Jewel jellyLiriope tetraphyllaGeryoniidaeNot recordedNot recordedNot recorded
Fire coralMillepora complanataMilleporidaeNot recordedNot recordedNot recorded
Fire coralMillepora exaesaMilleporidaeNot recordedNot recordedNot recorded
Fire coralMillepora teneraMilleporidaeNot recordedNot recordedNot recorded
Crystal jellyAequorea forskaleaAequoreidaeNot recordedNot recordedNot recorded
Pink helmetAglantha digitaleRhopalonematidaeNot recordedNot recordedNot recorded
Podded hydroidAglaophenia plumaAglaopheniidaeNot recordedNot recordedNot recorded
Ringed tubulariaEctopleura larynxTubulariidaeNot recordedNot recordedNot recorded
SnailfurHydractinia echinataHydractiniidaeNot recordedNot recordedNot recorded
Hula skirt siphonophorePhysophora hydrostaticaPhysophoridaeNot recordedNot recordedNot recorded
Oaten pipeTubularia indivisaTubulariidaeNot recordedNot recordedNot recorded
Crimson jellyTurritopsis rubraOceaniidaeNot recordedNot recordedNot recorded
American pipitAglaura hemistomaRhopalonematidaeNot recordedNot recordedNot recorded
Grapevine hydroidEudendrium racemosumEudendriidaeNot recordedNot recordedNot recorded
StickhydroidEudendrium ramosumEudendriidaeNot recordedNot recordedNot recorded
Trunked jellyfishGeryonia proboscidalisGeryoniidaeNot recordedNot recordedNot recorded
Yellow feathersGymnangium montaguiAglaopheniidaeNot recordedNot recordedNot recorded
Sea thread hydroidObelia dichotomaCampanulariidaeNot recordedNot recordedNot recorded
Kelp furObelia geniculataCampanulariidaeNot recordedNot recordedNot recorded
Sea nettlePennaria distichaPennariidaeNot recordedNot recordedNot recorded
Giant bell jellyScrippsia pacificaCorynidaeNot recordedNot recordedNot recorded
Small fringed jellyTima formosaEirenidaeNot recordedNot recordedNot recorded
Tubular sponge hydroidZyzzyzus warreniTubulariidaeNot recordedNot recordedNot recorded
Weird round winged jellyAbyla bicarinataAbylidaeNot recordedNot recordedNot recorded
Feather plume hydroidAglaophenia latecarinataAglaopheniidaeNot recordedNot recordedNot recorded
Stinging hydroidAglaophenia whiteleggeiAglaopheniidaeNot recordedNot recordedNot recorded
StickyhydroidBougainvillia muscusBougainvilliidaeNot recordedNot recordedNot recorded
Club polypsClava multicornisHydractiniidaeNot recordedNot recordedNot recorded
Fine hydroidCorhiza scotiaeHalopterididaeNot recordedNot recordedNot recorded
Lace coralDistichopora violaceaStylasteridaeNot recordedNot recordedNot recorded
Sea oakDynamena pumilaSertulariidaeNot recordedNot recordedNot recorded
Sea firEudendrium rameumEudendriidaeNot recordedNot recordedNot recorded
Shell-mimic hydroidHydrocorella africanaHydractiniidaeNot recordedNot recordedNot recorded
Pheasant-tail hydroidLytocarpia myriophyllumAglaopheniidaeNot recordedNot recordedNot recorded
Box fire coralMillepora squarrosaMilleporidaeNot recordedNot recordedNot recorded
Clinging jellyfishNemopsis bacheiBougainvilliidaeNot recordedNot recordedNot recorded
Little seabristlePlumularia setaceaPlumulariidaeNot recordedNot recordedNot recorded
Clapper medusaSarsia tubulosaCorynidaeNot recordedNot recordedNot recorded
Great tooth hydroidSertularella polyzoniasSertularellidaeNot recordedNot recordedNot recorded
WhiteweedSertularia cupressinaSertulariidaeNot recordedNot recordedNot recorded
Noble coralStylaster nobilisStylasteridaeNot recordedNot recordedNot recorded
Bottle-brushThuiaria thujaSertulariidaeNot recordedNot recordedNot recorded
Sea firAbietinaria abietinaSertulariidaeNot recordedNot recordedNot recorded
Golf tee medusaAegina citreaAeginidaeNot recordedNot recordedNot recorded
Crystal jellyAequorea coerulescensAequoreidaeNot recordedNot recordedNot recorded
Flat glassy jellyAequorea tenuisAequoreidaeNot recordedNot recordedNot recorded
Ostrichplume hydroidAglaophenia struthionidesAglaopheniidaeNot recordedNot recordedNot recorded
Common wiry feather hydroidAntennella secundariaHalopterididaeNot recordedNot recordedNot recorded
Gnome's hat hydroidCandelabrum capensisCandelabridaeNot recordedNot recordedNot recorded
Constricted jellyfishCatablema vesicariumPandeidaeNot recordedNot recordedNot recorded
Gregarious jellyClytia gregariaCampanulariidaeNot recordedNot recordedNot recorded
Silky medusaColobonema sericeumRhopalonematidaeNot recordedNot recordedNot recorded
Nodding hydroidCorymorpha nutansCorymorphidaeNot recordedNot recordedNot recorded
Red flowerhead polypCoryne pusillaCorynidaeNot recordedNot recordedNot recorded
Lily hydroidDiphasia rosaceaSertulariidaeNot recordedNot recordedNot recorded
Tubular hydroidEctopleura croceaTubulariidaeNot recordedNot recordedNot recorded
Bean clam hydroidEucheilota bakeriLovenellidaeNot recordedNot recordedNot recorded
Red stickhydroidEudendrium carneumEudendriidaeNot recordedNot recordedNot recorded
Umbrella jellyEutonina indicansEirenidaeNot recordedNot recordedNot recorded
Sea hedgehog hydroidHalecium muricatumHaleciidaeNot recordedNot recordedNot recorded
Alberta hydraHydra canadensisHydridaeNot recordedNot recordedNot recorded
High-spined commensal hydroidHydractinia altispinaHydractiniidaeNot recordedNot recordedNot recorded
HydroidHydrallmania falcataSertulariidaeNot recordedNot recordedNot recorded
SeabellsLaomedea flexuosaCampanulariidaeNot recordedNot recordedNot recorded
Coquina hydroidLovenella gracilisLovenellidaeNot recordedNot recordedNot recorded
Smoky feather hydroidMacrorhynchia filamentosaAglaopheniidaeNot recordedNot recordedNot recorded
Estuarine jellyMaeotias marginataOlindiidaeNot recordedNot recordedNot recorded
Fire coralMillepora foveolataMilleporidaeNot recordedNot recordedNot recorded
Common siphonophoreNanomia bijugaAgalmatidaeNot recordedNot recordedNot recorded
Sea beardNemertesia antenninaPlumulariidaeNot recordedNot recordedNot recorded
Doubletoothed hydroidObelia bidentataCampanulariidaeNot recordedNot recordedNot recorded
HydroidObelia longissimaCampanulariidaeNot recordedNot recordedNot recorded
Red paper lantern jellyPandea rubraPandeidaeNot recordedNot recordedNot recorded
Horsetail hydroidRhizocaulus verticillatusCampanulariidaeNot recordedNot recordedNot recorded
Planar hydroidSertularella arbusculaSertularellidaeNot recordedNot recordedNot recorded
Snail trefoil hydroidSertularella rugosaSertularellidaeNot recordedNot recordedNot recorded
Grey fan hydroidSolanderia procumbensSolanderiidaeNot recordedNot recordedNot recorded
Lace coralStylaster californicusStylasteridaeNot recordedNot recordedNot recorded
Sea tamariskTamarisca tamariscaSertulariidaeNot recordedNot recordedNot recorded
Sea spleenwortThuiaria articulataSertulariidaeNot recordedNot recordedNot recorded
Fern hydroidAbietinaria filiculaSertulariidaeNot recordedNot recordedNot recorded
Mussel beardAmphisbetia bispinosaSertulariidaeNot recordedNot recordedNot recorded
Black sea jellyfishBlackfordia virginicaBlackfordiidaeNot recordedNot recordedNot recorded
Creeping bell hydroidCalycella syringaCampanulinidaeNot recordedNot recordedNot recorded
Aquarium medusaCladonema radiatumCladonematidaeNot recordedNot recordedNot recorded
Indian Ocean shell-encrusting hydroidClavactinia gallensisHydractiniidaeNot recordedNot recordedNot recorded
Sea pine hydroidDiphasia margaretaSertulariidaeNot recordedNot recordedNot recorded
White stickhydroidEudendrium albumEudendriidaeNot recordedNot recordedNot recorded
California stickhydroidEudendrium californicumEudendriidaeNot recordedNot recordedNot recorded
Slender stickhydroidEudendrium capillareEudendriidaeNot recordedNot recordedNot recorded
Green-spotted jellyEutima miraEirenidaeNot recordedNot recordedNot recorded
Red-spotted siphonophoreForskalia edwardsiiForskaliidaeNot recordedNot recordedNot recorded
Herringbone hydroidHalecium halecinumHaleciidaeNot recordedNot recordedNot recorded
Balloon jellyHalitholus cirratusPandeidaeNot recordedNot recordedNot recorded
Slender hydraHydra circumcinctaHydridaeNot recordedNot recordedNot recorded
Saw-toothed fern hydroidIdiellana pristisSertulariidaeNot recordedNot recordedNot recorded
Plumed hydroidKirchenpaueria pinnataKirchenpaueriidaeNot recordedNot recordedNot recorded
Sea grass sea firLaomedea angulataCampanulariidaeNot recordedNot recordedNot recorded
Fire coralMillepora striataMilleporidaeNot recordedNot recordedNot recorded
HydroidNemertesia ramosaPlumulariidaeNot recordedNot recordedNot recorded
Club hydromedusaOrchistoma pileusOrchistomatidaeNot recordedNot recordedNot recorded
Red-eye medusaPolyorchis penicillatusCorynidaeNot recordedNot recordedNot recorded
Lined water jellyRhacostoma atlanticumAequoreidaeNot recordedNot recordedNot recorded
Seafan hydroidSolanderia gracilisSolanderiidaeNot recordedNot recordedNot recorded
Hanging stomach jellyStomotoca atraPandeidaeNot recordedNot recordedNot recorded
Lace coralStylaster roseusStylasteridaeNot recordedNot recordedNot recorded
Sessile hydrozoansSymplectoscyphus tricuspidatusSymplectoscyphidaeNot recordedNot recordedNot recorded
Sea pine hydroidAbietinaria kincaidiSertulariidaeNot recordedNot recordedNot recorded
Southern crystal jellyAequorea australisAequoreidaeNot recordedNot recordedNot recorded
Conical crystal jellyAequorea conicaAequoreidaeNot recordedNot recordedNot recorded
Plume hydroidAglaophenia tubuliferaAglaopheniidaeNot recordedNot recordedNot recorded
Linear bell hydroidClytia linearisCampanulariidaeNot recordedNot recordedNot recorded
Fairypalm hydroidCorymorpha palmaCorymorphidaeNot recordedNot recordedNot recorded
Blue-cross jellyCosmetira pilosellaMitrocomidaeNot recordedNot recordedNot recorded
Lace coralDistichopora vervoortiStylasteridaeNot recordedNot recordedNot recorded
Pink-mouth hydroidEctopleura marinaTubulariidaeNot recordedNot recordedNot recorded
Pourtalès's lace hydrocoralErrinopora pourtalesiiStylasteridaeNot recordedNot recordedNot recorded
Annulate stickhydroidEudendrium annulatumEudendriidaeNot recordedNot recordedNot recorded
Annulate sticky hydroidEudendrium vaginatumEudendriidaeNot recordedNot recordedNot recorded
Spiral siphonophoreForskalia tholoidesForskaliidaeNot recordedNot recordedNot recorded
Orange hydroidGarveia annulataBougainvilliidaeNot recordedNot recordedNot recorded
Thread hydroidHalopteris carinataHalopterididaeNot recordedNot recordedNot recorded
Jersey hydraHydra hymanaeHydridaeNot recordedNot recordedNot recorded
Oregon hydraHydra oregonaHydridaeNot recordedNot recordedNot recorded
Utah hydraHydra utahensisHydridaeNot recordedNot recordedNot recorded
Black bush hydroidMacrorhynchia clarkeiAglaopheniidaeNot recordedNot recordedNot recorded
Snow globe jellyModeeria rotundaTiarannidaeNot recordedNot recordedNot recorded
Common curled hydroidNemalecium lightiHaleciidaeNot recordedNot recordedNot recorded
Tube hydrocoralPliobothrus tubulatusStylasteridaeNot recordedNot recordedNot recorded
Solitary gorgonian hydroidRalpharia gorgoniaeTubulariidaeNot recordedNot recordedNot recorded
Veiled medusaRhopalonema velatumRhopalonematidaeNot recordedNot recordedNot recorded
Dinner plate medusaSolmissus marshalliCuninidaeNot recordedNot recordedNot recorded
Whitecross jellyStaurostoma mertensiiLaodiceidaeNot recordedNot recordedNot recorded
Corrugated lace hydrocoralStylantheca papillosaStylasteridaeNot recordedNot recordedNot recorded
Common lace hydrocoralStylaster campylecusStylasteridaeNot recordedNot recordedNot recorded
Fuchsia lace hydrocoralStylaster venustusStylasteridaeNot recordedNot recordedNot recorded
Pink branching lace hydrocoralStylaster verrilliiStylasteridaeNot recordedNot recordedNot recorded
Galapagos dandelionsThermopalia taraxacaRhodaliidaeNot recordedNot recordedNot recorded
Algae hydroidThyroscyphus ramosusThyroscyphidaeNot recordedNot recordedNot recorded
Zigzag jellyZygocanna buitendijkiAequoreidaeNot recordedNot recordedNot recorded
Curtained jellyEperetmus typusOlindiidaeNot recordedNot recordedNot recorded
Great lakes jellyfishLimnocnida tanganjicaeOlindiidaeNot recordedNot recordedNot recorded
Cross jellyfishMitrocoma cellulariaMitrocomidaeNot recordedNot recordedNot recorded
Dinner plate jellySolmissus incisaCuninidaeNot recordedNot recordedNot recorded
Australian crystal jellyAequorea kurangaiAequoreidaeNot recordedNot recordedNot recorded
Paired-bell siphonophoreAgalma okeniiAgalmatidaeNot recordedNot recordedNot recorded
Plumed hydroidCallicarpa chazalieiPlumulariidaeNot recordedNot recordedNot recorded
Rope grass hydroidCalyptospadix ceruleaBougainvilliidaeNot recordedNot recordedNot recorded
One-armed jellyCorymorpha pendulaCorymorphidaeNot recordedNot recordedNot recorded
White stingerMacrorhynchia philippinaAglaopheniidaeNot recordedNot recordedNot recorded
HydroidPachycordyle michaeliBougainvilliidaeNot recordedNot recordedNot recorded
Sea cypressPachyrhynchia cuppressinaAglaopheniidaeNot recordedNot recordedNot recorded
Miller hydractiniaSchuchertinia milleriHydractiniidaeNot recordedNot recordedNot recorded
Unbranched hydroidThyroscyphus marginatusThyroscyphidaeNot recordedNot recordedNot recorded
Raspberry hydroidZyzzyzus rubusidaeusTubulariidaeNot recordedNot recordedNot recorded
Feather bush hydroidDentitheca dendriticaPlumulariidaeNot recordedNot recordedNot recorded
Golden fern hydroidDynamena crisioidesSertulariidaeNot recordedNot recordedNot recorded
Flower hat jellyOlindias formosusOlindiidaeNot recordedNot recordedNot recorded
Southern man-o-warPhysalia megalistaPhysaliidaeNot recordedNot recordedNot recorded
Dwarf man o' warPhysalia minutaPhysaliidaeNot recordedNot recordedNot recorded
Smoothspined snailfurPodocoryna carneaHydractiniidaeNot recordedNot recordedNot recorded
Hairy jellySpirocodon saltatrixCorynidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria alexanderiSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria alternithecaSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria anguinaSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria annulataSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria compressaSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria crassipariaSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria cruciformisSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria derbekiSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria elsae-osaealdaeSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria elsaeoswaldaeSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria expansaSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria fuscaSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria gagaraeSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria giganteaSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria gracilisSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria immersaSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria inconstansSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria interversaSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria juniperusSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria laevimarginataSertulariidaeNot recordedNot recordedNot recorded
Not recordedAbietinaria macrothecaSertulariidaeNot recordedNot recordedNot recorded