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Diadumene franciscana San Francisco Anemone, East Coast anemone

Diadumene franciscanais commonly referred to as San Francisco Anemone, East Coast anemone. Difficulty in the aquarium: There are no reports available yet that this animal has already been kept in captivity successfully. Toxicity: Toxic hazard unknown.

Profilbild Urheber Douglas Mason, USA

Foto: Berkeley Marina, Kalifornien, USA

Courtesy of the author Douglas Mason, USA Copyright Douglas Mason Please visit for more information.

Uploaded by AndiV.

Image detail


Diadumene franciscana 
San Francisco Anemone, East Coast Anemone 
Family tree:
Animalia (Kingdom) > Cnidaria (Phylum) > Anthozoa (Class) > Actiniaria (Order) > Diadumenidae (Family) > Diadumene (Genus) > franciscana (Species) 
Initial determination:
Hand, 1956 
Canada , East cost of USA, Hawaii, Invasive Species, Northeast Pacific Ocean 
Sea depth:
0 - 10 Meter 
up to 0.79" (2 cm) 
°F - 84.2 °F (°C - 29°C) 
Amphipods, Copepods, Crustacean larvae , Crustaceans, Daphnia salina, Invertebrates, Zooxanthellae / Light 
There are no reports available yet that this animal has already been kept in captivity successfully 
Not available as offspring 
Toxic hazard unknown 
Not evaluated 
Red List:
Not evaluated (NE) 
Related species at
Catalog of Life:
More related species
in this lexicon:
Last edit:
2021-04-17 19:09:25 


Very special thanks for the first photo of the San-Francisco-Anemone (Diadumene franciscana) to Douglas Mason, San Francisco Bay Area, USA.

Diadumene franciscana is commonly known as the San Francisco anemone.
It has only been reported from the California coast and Hawaii, but is believed to have been introduced to both regions.
Its area of origin is unknown.
Diadumene franciscana was first collected in San Francisco Bay in the 1940s and has since been found from San Diego to Tomales Bay.
It is known from estuaries and sheltered waters where it grows on pilings, floats, and seagrasses.
Like other anemones, it feeds by capturing zooplankton and small epibenthic animals with its tentacles.

When extended, the column of the polyp of Diadumene franciscana is about 2x as wide.
Most specimens are less than 20 mm high and 10 mm in diameter.
This anemone has acontia, filamentous structures lined with cnidocytes (cells bearing nematocysts), arising from the median lobes of the incomplete mesenteries, which partially subdivide the gastrovascular cavity.
The acontia may protrude into the body cavity or be expelled through pores to defend themselves when disturbed or handled.
The anemone has fewer than 100 tentacles, and there is a substantial tentacle-free zone around the mouth.
The two tentacles (called guide tentacles) at each end of the slit-shaped mouth are closer to the mouth than the other tentacles and are yellowish in color.

The body column of Diadumene franciscana is pale green, cream or gray and translucent when extended.
It often has up to 48 double or single white stripes on the column, but is sometimes stripeless.

This anemone is transparent when expanded, but cream, gray, or light green when contracted.
It is usually marked with single or double longitudinal white stripes, but may be unmarked.
Diadumene franciscana often occurs in groups as it frequently reproduces asexually (clonal formation).

Translated with (free version)

External links

  1. Flickr Homepage Douglas Mason (en). Abgerufen am 17.04.2021.
  2. World Register of Marine Species (WoRMS) (en). Abgerufen am 17.04.2021.



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