Anemones · Marine Life

False plum anemone (Pseudactinia flagellifera)

Details of the mauve-tipped tentacles. Cape Agulhas, Western Cape (2020) – iNaturalist

Column smooth, orange to red, tentacles red or yellow, often mauve-tipped. Cannot readily retract tentacles or close up. 3-5 rows of bubble-like, orange vesicles and one row of spherules just outside tentacles.

50 – 100 mm in diameter.

Found singly, because aggressively territorial, inflating its vesicles and raking them across unrelated, intruding individuals to sting and repel them. Preys mostly on mollusks and crustaceans. Has the most potent venom known for an anemone.

Two Oceans: A Guide to the Marine Life of Southern Africa (2016)

From Saldanha Bay to East London, Pseudactinia varia can also be present, although smaller (about 20 mm) and with only 1-2 rows of vesicles. An undescribed species has the column mottled white and can be found from Cape Peninsula to Aliwal Shoal.

Small anemone (maybe Pseudactinia varia) attached on the wall side of a rock pool. Cape Agulhas, Western Cape (2020).
This anemone can’t physically retract its tentacles or close up. Cape Agulhas, Western Cape (2020) – iNaturalist
Group of anemones, probably genetically related, in a rock crevice. Cape Agulhas, Western Cape (2020) – iNaturalist
Details of the rows of bubble-like orange vehicles outside the tentacles. Port Alfred, Eastern Cape (2023) – iNaturalist

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