Overview

Comprehensive Description

Biology: Nematocysts

More info
LocationImageCnidae TypeRange of
Lengths (m)
Range of
Widths (m)
nNState
Carlgren O., 1945
Actinopharynx
N/A microbasic amastigophores  42.3 - 52.2  x  5.6 - 6.3  /
N/A microbasic amastigophores  11.3 - 21  x   - 3.5  /
Branches
N/A basitrichs  10 - 14  x   - 2  /
N/A microbasic amastigophores  8.5 - 18.3  x  3 - 4.2  /
N/A microbasic amastigophores  32.4 - 36.6  x   - 4.2  /
N/A microbasic amastigophores  21 - 38  x  4.2 - 5.6  /
N/A spirocysts   -   x   -   /
Column
N/A basitrichs  8.5 - 10.6  x   - 2  /
N/A microbasic amastigophores  19.7 - 29.6  x  4.2 - 5.5  /
N/A microbasic amastigophores  10 - 15.5  x  2.8 - 4.2  /
N/A microbasic p-mastigophores  7 - 12  x   - 4.2  /
Filaments
N/A microbasic amastigophores  14.1 - 21  x  3.5 - 4.2  /
N/A microbasic amastigophores  49.3 - 56.4  x  8.5 - 11.3  /
N/A microbasic p-mastigophores  6.3 - 10  x  3.5 - 4.2  /
Peduncle
N/A microbasic amastigophores  8.5 - 15.5  x  3 - 3.5  /
Pseudotentacles
N/A macrobasic amastigophores  39.5 - 57.8  x  10.6 - 15.5  /
N/A microbasic amastigophores  38 - 57.8  x  6 - 7  /
Tentacles
N/A basitrichs  15.5 - 22.6  x  2.2 - 3  /
N/A microbasic amastigophores  32.4 - 46.5  x  3.5 - 5.6  /
N/A microbasic amastigophores  55 - 65.5  x  6.3 - 7  /
N/A microbasic amastigophores  12.7 - 16.9  x  3.5 - 4.2  /
N/A spirocysts   -   x   -   /
N/A spirocysts   -   x   -   /
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© Hexacorallians of the World

Source: Hexacorallians of the World

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Ecology

Habitat

Depth range based on 1 specimen in 1 taxon.

Environmental ranges
  Depth range (m): 0 - 0
 
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Depth range based on 4 specimens in 1 taxon.
Water temperature and chemistry ranges based on 2 samples.

Environmental ranges
  Depth range (m): 0 - 15
  Temperature range (°C): 28.024 - 28.157
  Nitrate (umol/L): 0.209 - 0.882
  Salinity (PPS): 36.189 - 39.115
  Oxygen (ml/l): 4.409 - 4.598
  Phosphate (umol/l): 0.113 - 0.380
  Silicate (umol/l): 0.780 - 6.242

Graphical representation

Depth range (m): 0 - 15

Temperature range (°C): 28.024 - 28.157

Nitrate (umol/L): 0.209 - 0.882

Salinity (PPS): 36.189 - 39.115

Oxygen (ml/l): 4.409 - 4.598

Phosphate (umol/l): 0.113 - 0.380

Silicate (umol/l): 0.780 - 6.242
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Wikipedia

Triactis

Triactis is a genus of sea anemone in the family Aliciidae. It is monotypic, having only one speciesTriactis producta.[1] This is found in shallow waters in the Indo-Pacific where it lives on the seabed, rocks and corals. It derives much of its energy needs from the symbiotic algae it contains. It also forms a mutualistic relationship with small Lybia crabs.

Description[edit]

Triactis producta is a small, cryptic, pale brown sea anemone. The base grows to about 1 cm (0.4 in) in diameter and the column tapers slightly and extends to about 1.5 cm (0.6 in) in height. It is topped by a crown of about 50, relatively long tentacles. Halfway up the column there is a ring of branching, pale brown pseudo-tentacles. These are tubular extensions of the wall of the column and on their upper side there are a few semi-spherical bulges known as vesicles. These can be grey, pink or green and are packed with stinging cells called cnidocytes.[3]

Distribution and habitat[edit]

Triactis producta is found in shallow waters of the tropical Indo-Pacific Ocean, its range extending from the Red Sea and Mozambique to Hawaii and French Polynesia. It is inconspicuous, often growing in crevices and concealed among the branches of stony corals. It often occurs in dense clusters of what are probably cloned individuals.[3]

Biology[edit]

Lybia edmondsoni with Triactis producta

Triactis producta has two ways of feeding. In the daytime, when the light is bright, it retracts its tentacles and extends its pseudo-tentacles. These are dark brown because of the dense concentration of symbiotic algae known as zooxanthellae that they contain. These produce sugars by photosynthesis in sunlight which the anemone uses as nourishment. Retracting its tentacles maximises the photosynthetic potential of the anemone. The well-armed vesicles protect the pseudo-tentacles which may appear edible to a potential predator. At night, or when the animal is in a dim light, the crown of tentacles expands and the tentacles search for small invertebrates in the surrounding water, immobilising them with their cnidocytes.[3]

Boxer crabs in the genus Lybia have developed a mutualistic relationship with small sea anemones such as Triactis producta. The crab's front limbs have modified chelae, each of which can gently grip a sea anemone by its column, and it usually holds one in each claw. The living anemone is brandished like a weapon to keep predators away and is also used in ritualistic territorial protection. The sea anemones used are small and seldom exceed a column height of 8 mm (0.3 in). If it loses one of its anemones, the crab can tear the other one in half, after which each part grows into a new individual. The crab also uses the anemones to immobilise and capture prey on its behalf. The sea anemones seem unharmed by being used in this way.[3][4]

Interactions with humans[edit]

In the Red Sea, Triactis producta is reported to be one of the most venomous of sea anemones. The symptoms of stings to bare skin include pain and swelling. In one reported case, these lasted for several weeks and were accompanied by a pigmented, blistered lesion and prolonged skin sensitivity. The toxic agent was found to be very stable and resistant to chemicals and heat treatment.[5]

References[edit]

  1. ^ a b Fautin, Daphne (2009). "Triactis Klunzinger, 1877". World Register of Marine Species. Retrieved 2012-02-17. 
  2. ^ Fautin, Daphne (2009). "Triactis producta Klunzinger, 1877". World Register of Marine Species. Retrieved 2012-02-17. 
  3. ^ a b c d The sea anemone Triactis producta Klunzinger, 1877 by Andrea L. Crowther Invertebrate Zoology. Retrieved 2012-02-17.
  4. ^ Pom Pom Crabs - Perfect Nano Crabs Felicia's Aquarium Adventures. Retrieved 2012-02-18.
  5. ^ Levy, Shlomo; David Masry; Bruce W. Halstead (1970). "Report of Stingings by the Sea Anemone Triactis producta Klunzinger from Red Sea". Clinical Toxicology 3 (4): 637–643. doi:10.3109/15563657008990137. 
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