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Overview

Comprehensive Description

Biology: Nematocysts

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LocationImageCnidae TypeRange of
Lengths (m)
Range of
Widths (m)
nNState
Carlgren O., 1940
Actinopharynx
N/A microbasic amastigophores  13 - 17  x  3 -   /
Column
N/A atrichous isorhizas [atrichs]  13 - 17  x  2 -   / unfired
N/A microbasic amastigophores  18 - 22  x  3 -   / unfired
N/A spirocysts   -   x   -   /
Filaments
N/A basitrichs  8 - 10  x  1.5 - 2  /
N/A microbasic amastigophores  11 -   x  2 -   /
N/A microbasic amastigophores  19 - 26  x  3.5 - 4  /
N/A microbasic p-mastigophores  7 - 8  x  3 -   /
Tentacles
N/A atrichous isorhizas [atrichs]  11 -   x  2.5 - 3  /
N/A atrichous isorhizas [atrichs]  26 - 31  x  3.5 - 4  /
N/A microbasic amastigophores  34 - 43  x  3.5 - 4  /
N/A microbasic amastigophores  11 -   x  2.5 - 3  /
N/A spirocysts   -   x   -   /
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© Hexacorallians of the World

Source: Hexacorallians of the World

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Description

A very tiny anemone, up to 5mm tall including tentacles. Column slender, with slightly flattened, adherent base. About 16 large (bulky) non-retractile tentacles. Colour whitish or pink, very translucent. Like Protanthea simplex, it is a very active species. It can swim by thrashing its tentacles or by 'looping' on the substrate, alternately using base and tentacles. It reproduces by transverse division, sometimes chains of up to three anemones which have not separated are found. Unlikely to be confused with any other anemones (except juvenile Protanthea simplex) but may resemble various naked hydroids. Hydroids however are colonial animals and are attached to a substrate. Hydroids do not possess a throat, which in Gonactinia can be seen through the transparent body wall.
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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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Distribution

European arctic to Maine
  • North-West Atlantic Ocean species (NWARMS)
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Rarely reported due to its small size. Old records from west Scotland and south Cornwall around 1900, and recently from Plymouth, Northern Ireland and Lough Hyne. It is common in some parts of Scandinavia and it has also been recorded from the Mediterranean.
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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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Ecology

Habitat

sandy, muddy, or rocky habitats; also may attached themselves to hard parts or products of other organisms (shells)
  • North-West Atlantic Ocean species (NWARMS)
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Depth range based on 16 specimens in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 0 - 100
  Temperature range (°C): 14.039 - 14.039
  Nitrate (umol/L): 4.086 - 4.086
  Salinity (PPS): 33.725 - 33.725
  Oxygen (ml/l): 5.814 - 5.814
  Phosphate (umol/l): 0.813 - 0.813
  Silicate (umol/l): 4.469 - 4.469

Graphical representation

Depth range (m): 0 - 100
 
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On sea-weeds, worm-tubes, sea-squirts, etc. from 0-100m depth.
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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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Life History and Behavior

Behavior

Diet

Generally, anthozoans are primarly carnivorous which prey on sea urchins, gastropods, bivalves, or crustaceans that crawl or swim into their grasp.
  • North-West Atlantic Ocean species (NWARMS)
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© WoRMS for SMEBD

Source: World Register of Marine Species

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