Sea Anemones







British Marine Life Study Society

  Sagartiogeton undatus Anemone
Common Name(s):

Scientific Name:
 Sagartiogeton undatus 
Usual Size:  to 25 mm (base diameter)

                                Photograph by Andy Horton

Sagartiogeton undatus (Photograph by Andy Horton)

The links on the left hand side contain more information. 

This sea anemone tends to expand in darkness (observations in home aquaria).

Very difficult to detach from rocks and groynes to which it is fastened, and the anemone has a 50% chance of being fatally damaged if removed this way. Despite this strong adherence the anemone's appearance intertidally are infrequent, and congregations of this anemone may all move to a new location the following day.

Similar species:   Sagartiogeton laceratus
Notes:  Sagartiogeton viduatus is not a synonym but a different species. 

Not known.
No reproduction activity has been observed in captivity. However, my observations on the shore indicate small colonies from 2 to 12 possibly more of this sea anemone in March and April, although usually only occasional single specimens are discovered, usually in spring or autumn (Sussex coast).

Sagartiogeton undatus is very common on the shores of the Netherlands, especially in the estuaries of the southern part. much of what I know about this species can be read in my book on the Dutch sea anemones (Bloemdieren, de zeeanemonen en hun verwanten van de Nedelandse kust, ISBN 90-803595-1-3). Your Belgian contact may be able to read it as it is Dutch, of course. if you tell him or her to contact me I may be able to advise on the easiest and cheapest way to get a copy. 

I have kept specimens of S. undatus in my aquarium over a period of 30 years. As far as reproduction is concerned I witnessed the release of eggs only once. I never saw asexual reproduction.

Ron Ates

Occasionally intertidal.
Known from:
Kingston Beach, Shoreham-by-Sea
Worthing Pier
Carrion, small invertebrates. 

Additional Notes:
Emits acontia. 
Philip Henry Gosse christened this species the Snakelocks, but this name proved popular with the commoner species Anemonia viridis.

Information wanted: Please send any records of this sea anemone, with location, date, who discovered it, how it was identified, prevalence, common name and any other details to 
Shorewatch Project EMail 
All messages will receive a reply. 
Shorewatch Project


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