Overview

Comprehensive Description

Description

 Diadumene cincta is a small, slender anemone up to 35 mm in height, usually orange in colour. It has up to 200 tentacles on the oral disc which are also orange in colour but paler than the column. The surface of the column is smooth and is dotted with irregularly spaced pores (called cinclides) that serve to release water from the body cavities when the anemone contracts. When contracted, the body appears distorted and the parapet, a fold of tissue surrounding the tentacle-bearing part of the body (the capitulum), is distinct. When Diadumene cincta extends, the parapet folds out and becomes indistinct. If disturbed, this anemone extrudes stinging cell-bearing tentacles called acontia through the mouth to deter attackers.Diadumene cincta may be mistaken for small plumose anemones Metridium senile as these two species are found in the same habitat. Diadumene cincta is much more erect and has fewer tentacles than Metridium senile, which has a dumpy appearance.
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Biology: Nematocysts

More info
LocationImageCnidae TypeRange of
Lengths (m)
Range of
Widths (m)
nNState
Carlgren O., 1940
Acontia
N/A basitrichs  12 - 17  x  1 - 2  /
N/A microbasic p-mastigophores  46 - 56  x  7 - 7.5  /
Actinopharynx
N/A basitrichs  22 - 23  x  2.5 -   /
N/A microbasic p-mastigophores  22 - 31  x  3 - 4.5  /
Column
N/A basitrichs  14 - 21  x  3 -   / fired
N/A basitrichs  8.5 - 10  x  1.5 -   /
microbasic amastigophores  14 -   x  3 -   /
microbasic amastigophores  12 - 20  x  2.5 - 3  /
microbasic p-mastigophores  22 - 24  x  5 -   /
Filaments
N/A basitrichs  14 - 15.5  x  1.5 - 2.5  /
N/A microbasic p-mastigophores  9 - 10.5  x  4.2 -   /
N/A microbasic p-mastigophores  17.5 - 25.5  x  4 - 4.5  /
N/A microbasic p-mastigophores  14 - 18.5  x  5 - 6  /
Tentacles
atrichous isorhizas [atrichs]  31 - 38  (41) x  7 - 9  /
N/A basitrichs  17 - 27  x (1.5)  2 -   (2.5) /
N/A basitrichs  12 - 18  x  1.5 - 2.5  /
holotrichs  23 - 31  x  4 - 6.5  /
microbasic amastigophores  22 - 24  x  3.5 - 4  /
microbasic amastigophores  43 - 50  x  7 -   /
N/A microbasic p-mastigophores  25 - 28  x  4.5 -   /
N/A microbasic p-mastigophores  9 - 14  x   - 4  (4.5) /
microbasic p-mastigophores  11 -   x  3 - 3.5  /
microbasic p-mastigophores  22 - 31  x  4 - 4.5  /
Fautin D. G., 1988
Acontia
N/A basitrichs (10)  15 - 18  (21) x   -   100 6 / 10 unfired
N/A microbasic p-mastigophores (40)  50 - 52  (64) x   -   100 8 / 10 unfired
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Description

A slender anemone with an elongated column divided into scapus and capitulum, with a parapet and fosse; in full extension the parapet may smooth away (see photo.). Acontia present, emitted from small pores on column which are visible as dark spots. Diameter of base up to 15mm, height to 60mm. Colour fairly consistent, translucent orange with a greenish tinge., especially on disc: a buff variety is also recorded. Reproduces by basal lacerations. When disturbed a fluffy expanded Diadumene will contract in a characteristic, jerky fashion. Small, orange specimens of Metridium senile may appear to be superficially similar but in these the parapet is permanent and contraction relatively smooth. Most small Metridium have a white band on each tentacle. Once Diadumene has been recognised future identification will pose no problems.
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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

Occurs on all coasts of the British Isles but rather local; also recorded in other parts of western Europe, possibly more widespread.
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Source: Encyclopedia of Marine Life of Britain and Ireland

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Ecology

Habitat

Depth range based on 4 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 0 - 3

Graphical representation

Depth range (m): 0 - 3
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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 Attached to hard substrata, particularly bivalve shells in pools in the intertidal and sublittoral down to depths of 40 m. Often found in variable salinity and may be abundant on marina pontoons.
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Mostly on the shore, in pools, under stones, commonly amongst mussels, or in shallow sublittoral down to about 20m. Often found in brackish water creeks, in estuaries and harbours, attached to piers or pontoons, etc.
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Source: Encyclopedia of Marine Life of Britain and Ireland

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