Class
Hydrozoa
241 species in this class. Browse scientific names and open each profile for distribution, taxonomy and available wildlife data.
Orders in Hydrozoa
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Families in Hydrozoa
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Species · page 1 of 5
sea fir
Abietinaria abietina
Sertulariidae
fern hydroid
Abietinaria filicula
SertulariidaeAbietinaria fusca
Abietinaria fusca
Sertulariidae
Abylopsis tetragona
Abylopsis tetragona
Abylidae
many-ribbed jellyfish
Aequorea forskalea
AequoreidaeAequorea pensilis
Aequorea pensilis
Aequoreidae
Équorée de verre
Aequorea vitrina
AequoreidaeAgalma clausi
Agalma clausi
Agalmatidae
Agalma elegans
Agalma elegans
Agalmatidae
Agalma okenii
Agalma okenii
Agalmatidae
pink helmet
Aglantha digitale
RhopalonematidaeAglaophenia acacia
Aglaophenia acacia
Aglaopheniidae
Aglaophénia allongée
Aglaophenia elongata
Aglaopheniidae
Aglaophénia à crochets
Aglaophenia harpago
Aglaopheniidae
Plume de Kirchenpauer
Aglaophenia kirchenpaueri
AglaopheniidaeAglaophenia parvula
Aglaophenia parvula
Aglaopheniidae
podded hydroid
Aglaophenia pluma
Aglaopheniidae
Aglaophenia tubiformis
Aglaophenia tubiformis
Aglaopheniidae
plume hydroid
Aglaophenia tubulifera
Aglaopheniidae
American pipit
Aglaura hemistoma
RhopalonematidaeAmphicaryon ernesti
Amphicaryon ernesti
Prayidae
Amphinema dinema
Amphinema dinema
Pandeidae
Amphinema rugosum
Amphinema rugosum
PandeidaeAmphisbetia distans
Amphisbetia distans
Sertulariidae
tamaris de mer
Amphisbetia operculata
Sertulariidae
Common wiry feather hydroid
Antennella secundaria
HalopterididaeHydraire-antenne
Antennella siliquosa
HalopterididaeApolemia lanosa
Apolemia lanosa
Apolemiidae
string jelly
Apolemia uvaria
Apolemiidae
Athorybia rosacea
Athorybia rosacea
Agalmatidae
Bassia bassensis
Bassia bassensis
AbylidaeHydroid
Bimeria vestita
Bougainvilliidaeblack Sea jellyfish
Blackfordia virginica
Blackfordiidae
Bougainvillia britannica
Bougainvillia britannica
Bougainvilliidae
Bougainvillia polyp
Bougainvillia muscus
Bougainvilliidae
Bougainvillia principis
Bougainvillia principis
Bougainvilliidae
Bougainvillia pyramidata
Bougainvillia pyramidata
Bougainvilliidaecreeping bell hydroid
Calycella syringa
Campanulinidaerope grass hydroid
Calyptospadix cerulea
BougainvilliidaeCampanularia breviscyphia
Campanularia breviscyphia
CampanulariidaeCampanularia hincksii
Campanularia hincksii
CampanulariidaeCampanularia volubilis
Campanularia volubilis
Campanulariidae
Candelabrum cocksii
Candelabrum cocksii
Candelabridae
Chelophye appendiculée
Chelophyes appendiculata
DiphyidaeChelophyes contorta
Chelophyes contorta
Diphyidae
Cladocoryne floccosa
Cladocoryne floccosa
Cladocorynidae
aquarium medusa
Cladonema radiatum
Cladonematidae
Club-headed Hydroid
Clava multicornis
HydractiniidaeClytia gracilis
Clytia gracilis
Campanulariidae
Hydroid
Clytia hemisphaerica
Campanulariidae
freshwater hydroid
Cordylophora caspia
CordylophoridaeHydroid
Corydendrium parasiticum
Oceaniidae
nodding hydroid
Corymorpha nutans
Corymorphidae
Coryne dubia
Coryne dubia
Corynidae
Coral de fuego
Coryne eximia
Corynidaegrande coryne
Coryne muscoides
CorynidaeCoryne pintneri
Coryne pintneri
Corynidae
red flowerhead polyp
Coryne pusilla
Corynidae
Blue-cross Jelly
Cosmetira pilosella
Mitrocomidae
freshwater jellyfish
Craspedacusta sowerbii
Olindiidae