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German wasp | Vespula germanica

German wasp

Vespula germanica

Coral bush | Ardisia crenata

Coral bush

Ardisia crenata

Purple loosestrife | Lythrum salicaria

Purple loosestrife

Lythrum salicaria

Pom pom weed | Campuloclinium macrocephalum

Pom pom weed

Campuloclinium macrocephalum

Canarybird bush | Crotalaria agatiflora

Canarybird bush

Crotalaria agatiflora

Peanut butter cassia | Senna didymobotrya

Peanut butter cassia

Senna didymobotrya

Rubber vine | Cryptostegia grandiflora

Rubber vine

Cryptostegia grandiflora

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Environmental Programmes

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Feather –duster anemone

Metridium senile

Common name:

Feather –duster anemone

Scientific name:

Metridium senile

Alternative common names:

Plumose anemone or frilled anemone. 

The feather –duster anemone is an anemone with a diverse range of forms.  They are cold water dwellers, found in all of the world's cold water oceans. It has numerous tentacles at the top of the column.  They occur in intertidal to sub tidal zones down to depths of 200 m.

Additional Info

  • Where does this species come from?

    North West Europe and east and west of North America

    What is its invasive status in South Africa?

    NEMBA category 3

    Where in South Africa is it a problem?

    Cape Town Table harbour Bay in Western Cape Province.

    How does it spread?

    The feather –duster anemone is dispersed by attaching itself to floating objects. If it lets go of its normally firmly anchored holdfast, it is frequently current-swept into new surroundings.

    Why is it a problem?

    Problematic for stock species as can compete for space and resources, obstructs the opening of bivalve shells and nets, reduces the value of shellfish, increases the weight of equipment, increases labour and production costs as a result of cleaning and removal of biofouling.

    What does it look like?

    Description: Metridium senile is an anemone of very variable form. The base is wider than the column and often irregular. When expanded, the numerous tentacles form a 'plume' above a conspicuous parapet at the top of the smooth column. Large individuals may be 30 cm high. The colour is plain, commonly white orange or dark green but brown, grey or occasionally red or yellow varieties occur. Habitat: Rocks, shells, floating docks, pilings; especially in bays. Occasionally found on the carapace and claws of kelp crabs. Breeding: Fertilization is external, and release of sperm into the water triggers release of eggs from females nearby. Eggs are pink and about 0.1 mm diameter.

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General News Updates

2019 National Symposium on Biological Invasio…


This is your invitation to South Africa's 2019 National Symposium on Biological Invasions. The convention is hosted by the Centre for Invasion Biology (CIB), University of Stellenbosch, and the Biolo... Read more

2019 Invasive Species Training


During the past five years (2014-2018), ISSA invasive species trainers have trained 4 000 in the identification of invasive species and laws pertaining to invasive species across South Africa.  ... Read more

Alien Grass Working Group


Who are we? The South African National Alien Grass Working Group was jointly initiated by the South African Biodiversity Institute (SANBI) and the Centre for Excellence in Invasion Biology (C·I·B) in... Read more

Permits for planting indigenous Cynodon?


On 16 February, 2018, South Africa's Department of Environmental Affairs issued amendments to the regulations and lists relating to the National List of Invasive Species.  Updates to the draft&n... Read more

Invasive species training 2018 dates released


Interested in invasive species?  How much do you know about NEMBA invasive species compliance for landowners and organs of state? The South African Green Industries Council (SAGIC) have released... Read more

Communications post for Africa advertised


The Nature Conservancy has advertised a brand new post:  Communications Manager, Africa Region. Knowledge of invasive species and water would be an asset in this post. See details below:    Job Titl... Read more