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Actinothoe sphyrodeta (Gosse, 1858)

White-striped anemone

Actinothoe sphyrodeta

Concarneau Bay, France, 10 meters, 2004, WBN

Actinothoe sphyrodeta

Ile de Groix, France, 9 meters, JMC

Description

Actinothoe sphyrodeta is an anemone that reaches 3 cm in diameter. It has up to 140 short, pointed, fully retractable white tentacles. The oral disc can be white or orange, in this case this sea anemone evokes daisy flowers. The 5 cm high column with a diameter of 2 cm is alternately adorned with opaque white and translucent gray longitudinal bands. When disturbed many aconties are issued from the column. Actinothoe sphyrodeta has two modes of reproduction, one sexual allows the species to spread, the other asexual, by longitudinal fissions, allows this anemone to duplicate quickly and cover large areas. White-striped anemones are frequently encountered in groups, they can cover large areas.
It lives fixed on the rocks, in particular on vertical surfaces along with Corynactis viridis, on wrecks, and on kelp.

Distribution

Actinothoe sphyrodeta lives between 0 and 40 meters deep in the North-East Atlantic, from the British Isles to Portugal and the English Channel. It could be locally present in the western Mediterranean.

Image satellite: © Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community.

Données de distribution : Actinothoe sphyrodeta (Gosse, 1858) in GBIF Secretariat (2019). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2020-10-24.

Classification

Source : World Register of Marine Species


Biota (Superdomain)
Animalia (Kingdom)
Cnidaria (Phylum)
Anthozoa (Class)
Hexacorallia (Subclass)
Actiniaria (Order)
Enthemonae (Suborder)
Metridioidea (Superfamily)
Sagartiidae (Family)
Actinothoe (Genus)
Actinothoe sphyrodeta (Species)

Page glossary

Retractile - Retract : action allowing the anemone to contract, the tentacles are then hidden.

Aconties : filamentous structures bearing stinging cells playing an offensive and defensive role.

Longitudinal fission : very common mode of reproduction in Actinarians leading the anemone to cut into two individuals of sometimes unequal size in a few hours.

Kelp : large algae living below the tidal area.

Authors

Text : Wilfried Bay-Nouailhat, Anne Bay-Nouailhat © 2005 - 2020.

Photos : © Wilfried Bay-Nouailhat, Jean-Michel Crouzet. Published with their kind permission.
Websites and reference works : Consult bibliography

Image satellite: © Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community.

Données de distribution : Actinothoe sphyrodeta (Gosse, 1858) in GBIF Secretariat (2019). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2020-10-24.

How to cite this page

Bay-Nouailhat W., Bay-Nouailhat A., May 2005, Description of Actinothoe sphyrodeta, [On line] http://european-marine-life.org/05/actinothoe-sphyrodeta.php, consulted on 2020 October 24.

Authors

Photographie de Wilfried Bay-Nouailhat

Wilfried Bay-Nouailhat

Diver - Naturalist
Underwater Photographer

Photographie de Anne Bay-Nouailhat

Anne Bay-Nouailhat

Project manager in marine environment
Professional diver - Naturalist

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