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Obelia dichotoma   (Linnaeus, 1758)

sea thread hydroid

Native range | All suitable habitat | Point map | Year 2100
This map was computer-generated and has not yet been reviewed.
Obelia dichotoma   AquaMaps   Data sources: GBIF OBIS
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Classification Common names | Synonyms | CoL | ITIS | WoRMS

Hydrozoa | Leptothecata | Campanulariidae

Main reference References | Biblio | Coordinator | Collaborators

Migotto, A.E., A.C. Marques, A.C. Morandini and F.L. da Silveira. 2002. (Ref. 813)

Size / Weight / Age


Sessile; brackish; depth range 0 - 100 m (Ref. 86643)

Climate / Range


Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions

Arctic, Atlantic, Indo-Pacific. Mostly polar, but also in subtropical, tropical, temperate and boreal climates.

Biology     Glossary (e.g. epibenthic)

Colonial (Ref. 19). Known from mangroves (Ref. 86642), tidal inlets, sheltered areas of bays, exposed areas of bays, including any ledges at their entrance, sounds, caves, still-water areas of anchialine ponds, shallow reefs, shallow coastal benthic habitats (< 25 m), deeper coastal substrates (25- 100m) of the offshore fore-reef slope and surface or near surface water layers, including porpitids and the halopelagic Sargassum fauna (Ref. 86643). Also found in Carrie Bow Cay, Belize, in patch reefs, mangrove islands, Thalassia beds, sand trough, outer ridge and fore-reef slopes on Thalassia beds, mangrove roots, floating Sargassum and substrates composed of dead corals and gorgonians at depths of 0.2 to 31 m ) (Ref. 87156). It is found mainly on hard substrates, wood, ropes, dead gorgonians and smaller colonies are epizoic to Symplectoscyphus spp., Bougainvillia muscus, Sertularella polyzonias, Hybocodon chilensis (Ref. 87801). As with other hydroids, this species exhibits a pelagic medusiod stage (Ref. 87156). Species exhibits both asexual and sexual reproduction by budding during hydroid stage and release of gametes in medusae stages (Ref. 1663, p. 23, 28). Period of reproductive maturity recorded for Carrie Bow Cay, Belize is 12th of April, during which the sample collected had gonophores or medusa buds (Ref. 87156).

IUCN Red List Status (Ref. 114614)


CITES status (Ref. 94142)

Not Evaluated

Threat to humans

Human uses

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More information

Common names
Egg development
Mass conversion

Internet sources

BHL | BOLD Systems | Check for other websites | Check FishWatcher | CISTI | DiscoverLife | FAO(Publication : search) | GenBank (genome, nucleotide) | GOBASE | Google Books | Google Scholar | Google | ispecies | National databases | PubMed | Scirus | FishBase | Tree of Life | uBio | uBio RSS | Wikipedia (Go, Search) | Zoological Record

Estimation of some characteristics with mathematical models

Price category (Ref. 80766)