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British Marine Life Study Society

  Diadumene cincta
Diadumene cincta  (Photographs by Paul Parsons)
Common Name(s):

Scientific Name:
  Diadumene cincta
Usual Size:                                      mm 

                         Photograph by Paul Parsons
Similar species:  Metridium senile

 Basal laceration. 


Today we were lucky enough to dive on the Indiana (Orange wreck) 1 mile south from Worthing Pier.
On one part of the scattered wreckage, a 3 m x 15 cm pole/pipe sticks up at about 30 degrees from the seabed. It is the only part of the wreck that I found groups of "Diadumene cinta". The pole is very exposed and the densest groups were found on the underside. They were amongst a turf of sponge, algae and hydroids.
I measured one of the largest anemones tentacle span = 5mm diameter. Their appearance is a slightly translucent, fawn coloured column with orange lines running it's length. The tentacles and disc are just as my previous photo's show. The white circular band was present on all the anemones and the mouth is orange. Some of these anemones were fully contracted. Their shape is very flat and wide, almost disc like. The orange lines all run from the base (outside edge) to the centre. No "collar" visible on any anemones. I gently touched the tentacles to see their response. Each anemone slowly rolled-in the touched tentacles just as you would roll your fingers into your palm. I am unsure what a jerky movement may be but these anemones responded similar to the movement of a snakelocks which I also studied today.
Water temp was 7° C  Does the temperature effect their movements?
Viz. was 3-4 m in 7.5m depth.

I hope these details can be of help.
Any other details should I have recorded?

Best wishes
Paul Parsons

Diadumene cincta is recorded at numerous locations especially in the English Channel on the Mermaid (MNCR) database.

11 June 2001

Diadumene cincta on a Dogwhelk shell (Photograph by Paul Parsons)Under the sea, Paul Parsons returned from a brief foray with a handful of very small Actinothoe sea anemones, a small sea hare Elysia viridis, and some other very small orange anemones with whitish orange tentacles. After close study I can confirm that these are the often overlooked Diadumene cincta. The mouth is orange in some specimens, but the most useful diagnostic difference from the similar Plumose Anemones is their instant jerky reaction when touched.
Under Worthing Pier (Page 3)

Diadumene cincta amongst Lightbulb Sea Squirts (Photograph by Paul Parsons)3 February 2001
The sea anemone Diadumene cincta has been identified and photographed by Paul Parsons off Worthing at a depth of 3 metres and they possibly occur off Shoreham as well. It is a small sea anemone that has probably overlooked before or incorrectly identified. The colony found was very small. It needs to be picked out amongst the background of the Lightbulb Sea Squirts, Clavelina lepadiformis.
Sea Anemones (Link)

It is NOT a familiar species for rockpoolers

Position: 50 49.00'N 00 11.99'W  Dredger wreck 5 - 10 metres depth.

August/September 2003 and earlier years
Occurs on the Brooklands outfall pipe, Lancing/Worthing border, West Sussex.
Paul Parsons



Additional Notes:

 News Item 2001

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
Cnidaria Web Site (World)


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