Overview

Brief Summary

Biology

colonial; fixed gonophores
  • UNESCO-IOC Register of Marine Organisms
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Comprehensive Description

Description

The main stem is straight but not as robust as Diphasia alata, sometimes it is extended, forming a long thin tendril that divides at its apex, into two short, thickened processes. The side branches are alternate and support oppositely paired hydrothecae. The hydrothecae are attached to the side branches for approximately 1/2 of their length. They are tubular in shape and bend outwards from the side branch in 1 plane at an angle of approximately 45 degrees. The outer rim of the hydrotheca is smooth, and on the inner face there is a notch and the opercular flap adjoins this. Colonies typically 40-50mm in size. This is a smaller Diphasia species and is most likely to be confused with Diphasia rosacea or Diphasia fallax.
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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

Reported from scattered localities all around the British Isles, but appears to be more frequent on the south western coasts.
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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

Depth range based on 14 specimens in 1 taxon.
Water temperature and chemistry ranges based on 5 samples.

Environmental ranges
  Depth range (m): 10 - 2500
  Temperature range (°C): 7.624 - 10.036
  Nitrate (umol/L): 2.853 - 6.121
  Salinity (PPS): 34.621 - 34.764
  Oxygen (ml/l): 5.952 - 6.351
  Phosphate (umol/l): 0.406 - 0.511
  Silicate (umol/l): 2.143 - 5.452

Graphical representation

Depth range (m): 10 - 2500

Temperature range (°C): 7.624 - 10.036

Nitrate (umol/L): 2.853 - 6.121

Salinity (PPS): 34.621 - 34.764

Oxygen (ml/l): 5.952 - 6.351

Phosphate (umol/l): 0.406 - 0.511

Silicate (umol/l): 2.143 - 5.452
 
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This hydroid often grows on the stems of other hydroids, and the tendrils are probably used to help secure attachment.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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