Overview

Comprehensive Description

Description

 The column of Cereus pedunculatus is dark and trumpet shaped, with large, protuberant pale 'suckers' occurring towards the top. Column height is usually up to 12 cm. It is typically a flesh, buff or greyish colour at the base, shading to dark grey, brown or purplish at the top. The oral disc is wide, usually 3-7 cm but can be as wide as 15 cm. Cereus pedunculatus tentacles are short, banded and mottled, numbering between 500 and 1000, and arranged in multiples of six around the oral disc. Colouration in the oral disc and tentacles varies from pale buff to deep purple or black. Often paler around the mouth.Older specimens of Cereus pedunculatus have a broad central tentacle-free area on the oral disc. Cereus pedunculatus have very similar colouration to Sagartia species. However, the column of Sagartia species is not trumpet-shaped. Only the oral disc of Cereus pedunculatus is visible on soft sand or mud as the column is buried. There is often debris attached to the suckers on column.
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Biology: Nematocysts

More info
LocationImageCnidae TypeRange of
Lengths (m)
Range of
Widths (m)
nNState
Carlgren O., 1945
Acontia
N/A basitrichs  29.6 - 35  x   - 3  /
N/A microbasic amastigophores  36 - 43.7  x   - 4  /
Actinopharynx
N/A basitrichs  21.8 - 28.2  x   - 3  /
N/A microbasic p-mastigophores  17.6 - 25.4  x  4.2 - 5.6  /
Column
N/A basitrichs  14.1 - 19.6  x  2.8 - 3  /
Filaments
N/A basitrichs  11.3 - 14.8  x  1.5 - 2.5  /
N/A microbasic p-mastigophores  14.8 - 21.1  x  4.2 - 5.5  /
Tentacles
N/A basitrichs  15.5 - 25.4  x  2.8 - 3  /
N/A microbasic p-mastigophores or amastigophores  20.4 - 22.6  x  3.5 - 4  /
N/A spirocysts   -   x   -   /
Riemann-Z?ck K., 1969
Acontia
N/A amastigophores  36 - 44  x   -   /
N/A basitrichs  30 - 35  x   -   /
Tentacles
N/A amastigophores  20.4 - 22.6  x   -   /
N/A basitrichs  15.5 - 25.4  x   -   /
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Description

The base of this sea anemone is closely adherent. The column is similar to that in Sagartia species, but flaring out, trumpet-shaped, to the wide disc. There are suckers on the column usually with gravel stuck to them. The tentacles are short and very numerous - more than 1000 in large specimens. The diameter of the disc may reach 100mm or more. The column is typically grey-brown, darker, almost purplish above; sometimes yellowish, pink, or reddish. The disc is often patterned and usually minutely flecked with white. Many colour varieties occur - brown, blue-grey, yellowish, typically variegated with purple, black, white, scarlet, etc.; a plain brown variety is common in some regions. Reproduces viviparously, often producing numerous young. Sagartia troglodytes, Cereus pedunculatus and Sagartia elegans all possess suckers on the column. In the first two of these species the suckers usually have gravel stuck to them.
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Distribution

A common species on the south and west coasts of the British Isles, all around southwest Europe and in the Mediterranean.
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Ecology

Habitat

littoral
  • UNESCO-IOC Register of Marine Organisms
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Depth range based on 135 specimens in 1 taxon.
Water temperature and chemistry ranges based on 21 samples.

Environmental ranges
  Depth range (m): 0 - 24
  Temperature range (°C): 11.639 - 12.348
  Nitrate (umol/L): 4.573 - 7.121
  Salinity (PPS): 35.008 - 35.363
  Oxygen (ml/l): 6.069 - 6.346
  Phosphate (umol/l): 0.333 - 0.439
  Silicate (umol/l): 2.448 - 3.727

Graphical representation

Depth range (m): 0 - 24

Temperature range (°C): 11.639 - 12.348

Nitrate (umol/L): 4.573 - 7.121

Salinity (PPS): 35.008 - 35.363

Oxygen (ml/l): 6.069 - 6.346

Phosphate (umol/l): 0.333 - 0.439

Silicate (umol/l): 2.448 - 3.727
 
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Depth range based on 1 specimen in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 0 - 0
  Temperature range (°C): 11.471 - 11.471
  Nitrate (umol/L): 4.850 - 4.850
  Salinity (PPS): 35.211 - 35.211
  Oxygen (ml/l): 6.200 - 6.200
  Phosphate (umol/l): 0.421 - 0.421
  Silicate (umol/l): 2.315 - 2.315
 
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 Cereus pedunculatus is typically found in pools, holes and crevices, or attached to stones beneath the surface of sediments from the mid shore to at least 50 m depth.
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Found on the shore in pools and gullies, typically with the base inserted into a deep crevice; or buried in mud or sand, attached to some buried object. Also occurs sublittorally on sand scoured rocks, often partly buried in sand, to at least 50m.
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Wikipedia

Cereus pedunculatus

Cereus pedunculatus or the daisy anemone is a species of sea anemone in the family Sagartiidae. It is found in shallow parts of the northeast Atlantic Ocean and in the North Sea and the Mediterranean Sea. It is an omnivore, predator and scavenger.[1]

Description

C. pedunculatus has a base that is sometimes frilled at the edge. It is wider than the trunk which is covered with small dots and can be cream, pink, brown or violet. The trunk may be stalk-like and up to ten centimetres tall, or shaped more like a trumpet. Both these forms can retract back into a squat, tentacle-fringed mound. The oral disc may be seven centimetres wide or even wider. There are more than 500 short, flaccid tentacles which may be a plain colour, banded or speckled.[2][3]

Distribution and habitat

C. pedunculatus is found in the northeast Atlantic Ocean south to the Azores, in the North Sea and the Mediterranean Sea [1] at depths down to 50 metres.[3] It is common round the southern and western coasts of the British Isles. It may grow in rock pools, often with the base and column concealed in a crevice, or it may be found in muddy gravel where it is anchored to a stone or other sub-surface object. In this case, the tentacles are the only part that project and the whole animal can be withdrawn into the substrate if danger threatens.[2]

References

  1. ^ a b c d Cereus pedunculatus (Pennant, 1777) World Register of Marine Species. Retrieved 2011-09-01.
  2. ^ a b John Barrett & C. M. Young (1958). Collins Pocket Guide to the Sea Shore. p. 58. 
  3. ^ a b Daisy anemone: Cereus pedunculatus Marine Life Information Network. Retrieved 2011-09-01.
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