Other identification tools | SeaLifeBase

Non-fish Identification: Find Species

Family: Hydractiniidae (See list of species below)

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Total number of spines in dorsal and anal fins (optional)



53 species with fin ray counts including ? spines in dorsal and ? in anal fins (see list below)
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Clava multicornis
[club hydroid]
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Cordylophora caspia
[freshwater hydroid]
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Corydendrium fruticosum
[]
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Corydendrium parasiticum
[]
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Hydractinia aculeata
[]
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Hydractinia aggregata
[]
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Hydractinia americana
[]
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Hydractinia angusta
[]
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Hydractinia antonii
[]
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Hydractinia arge
[]
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Hydractinia armata
[]
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Hydractinia borealis
[]
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Hydractinia californica
[]
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Hydractinia carica
[]
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Hydractinia carnea
[smoothspined snailfur]
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Hydractinia carolinae
[]
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Hydractinia dendritica
[]
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Hydractinia dubia
[]


Hydractinia echinata
[snailfur]
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Hydractinia fucicola
[]
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Hydractinia laevispina
[]
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Hydractinia milleri
[Miller hydractinia]
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Hydractinia minima
[]
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Hydractinia minuta
[]
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Hydractinia monocarpa
[]
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Hydractinia pacifica
[white bottlebrush hydroid]
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Hydractinia polycarpa
[]
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Hydractinia polyclina
[]
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Hydractinia selena
[]
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Hydractinia symbiolongicarpus
[]
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Hydractinia symbiopollicaris
[]
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Hydractinia valens
[]
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Janaria mirabilis
[]
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Merona cornucopiae
[]
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Merona laxa
[]


Oceania armata
[]
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Podocoryne apicata
[]
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Podocoryne borealis
[]
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Podocoryne carnea
[]
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Podocoryne minima
[]
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Podocoryne ocellata
[]
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Podocoryne simplex
[]
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Rhizodendrium sterreri
[]
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Rhizogeton ezoense
[]
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Rhizogeton fusiformis
[]
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Rhizogeton nematophorum
[]
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Rhizogeton nudum
[]
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Stylactaria hooperii
[]
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Tubiclava rubra
[]
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Turritopsis dohrnii
[]
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Turritopsis fascicularis
[]
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Turritopsis lata
[]
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Turritopsis nutricula
[immortal jellyfish]
53 Species of Family Hydractiniidae
()
Sort by: Species Length
Scientific Name English Name Distribution Max. Length (cm)
Clava multicornis club hydroid Atlantic, Arctic Oceans a
Cordylophora caspia freshwater hydroid Cosmopolitan.
Corydendrium fruticosum Eastern Pacific
Corydendrium parasiticum Southeast Pacific and Atl
Hydractinia aculeata Mediterranean
Hydractinia aggregata Eastern Pacific
Hydractinia americana Atlantic and Pacific Ocea
Hydractinia angusta Antarctic Pacific
Hydractinia antonii Northwest Pacific
Hydractinia arge Western Atlantic.
Hydractinia armata Eastern Pacific
Hydractinia borealis Northeast Atlantic
Hydractinia californica Eastern Pacific
Hydractinia carica Northern Atlantic, Northw
Hydractinia carnea smoothspined snailfur Western Central Pacific a
Hydractinia carolinae Western Atlantic
Hydractinia dendritica Antarctic
Hydractinia dubia Western Atlantic
Hydractinia echinata snailfur Atlantic Ocean and the Me
Hydractinia fucicola Mediterranean
Hydractinia laevispina Northwest Atlantic, Easte
Hydractinia milleri Miller hydractinia Eastern Pacific 2.5 H
Hydractinia minima Western Atlantic and the
Hydractinia minuta Western Atlantic, Caribbe
Hydractinia monocarpa Atlantic Ocean, Northwest
Hydractinia pacifica white bottlebrush hydroid Southeast Pacific
Hydractinia polycarpa Eastern Pacific
Hydractinia polyclina Western Atlantic
Hydractinia selena Western Atlantic
Hydractinia symbiolongicarpus Western Atlantic
Hydractinia symbiopollicaris Western Atlantic
Hydractinia valens Western Atlantic
Janaria mirabilis Eastern Pacific
Merona cornucopiae Atlantic Ocean
Merona laxa Eastern Pacific
Oceania armata Southwest Pacific, Wester 1 WD
Podocoryne apicata Northwest Pacific
Podocoryne borealis Sub-Antarctic and Northea
Podocoryne carnea Northeast Atlantic
Podocoryne minima Northwest Pacific
Podocoryne ocellata Western Central Atlantic
Podocoryne simplex Northwest Pacific
Rhizodendrium sterreri Western Atlantic
Rhizogeton ezoense Pacific Ocean
Rhizogeton fusiformis Western Atlantic
Rhizogeton nematophorum Eastern Pacific
Rhizogeton nudum Northern Atlantic and Arc
Stylactaria hooperii Southwest Atlantic
Tubiclava rubra Eastern Indian Ocean and
Turritopsis dohrnii Mediterranean
Turritopsis fascicularis Western Atlantic. Tropic
Turritopsis lata Southwest Pacific 0.3 WD
Turritopsis nutricula immortal jellyfish Atlantic, Caribbean and I 0.5 WD



Other identification tools in SeaLifeBase


Quick Identification
Identification keys
Identification by morphometrics
Identification by pictures:
          If you already know the Family, go to Search SeaLifeBase, select Family and click on 'Identification by pictures' to display all available pictures in SeaLifeBase for the family.

          If you already know the Country, go to
Search SeaLifeBase, select Country and click on 'Identification by pictures' to display all available pictures in SeaLifeBase for the country.

          If you already know the Ecosystem, go to
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