Overview

Brief Summary

Biology

colonial; fixed gonophores
  • UNESCO-IOC Register of Marine Organisms
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Source: World Register of Marine Species

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Comprehensive Description

Frequent on soft bottoms in shallow to moderately deep waters, particularly in temperate regions. One of the few species of Leptolida was (and probably still is) commercially exploited. Gonothecae produced in early spring. Colonies serve the attachment for mussel spat.
  • CORNELIUS P.F.S. (1995) North-West European Thecate Hydroids and their Medusae, 2. Synopses of the British Fauna (New Series) 50: VII, 1-386.

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Description

The main stem of this hydroid is rather slender and the feather-like side branches are arranged in a spiral. The hydrothecae are on the upper side of the pinnae. They are grouped together in tight clusters of 2-5 hydrothecae, and there is 1 cluster to each internode. Within each cluster the hydrothecae curve alternately outwards from the axis of the pinnae. The gonothecae are oval shaped and smooth, with a short neck. The rim of the aperture is smooth. This is a very distinctive species.
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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

Mid-Atlantic Ridge: Lucky Strike. Shallow to moderately deep waters of the temperate and northern Atlantic; not a deep water species.
  • CORNELIUS P.F.S. (1995) North-West European Thecate Hydroids and their Medusae, 2. Synopses of the British Fauna (New Series) 50: VII, 1-386.

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A common species all round the British Isles
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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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Physical Description

Morphology

Colony lax, with characteristic, spirally twisted, monosiphonic stem, supporting branches of 20-40 mm length with pinnately arranged hydrocladia. Each hydrocladium divided into internodes, supporting closely packed groups of 3-10 hydrothecae, alternately inclined left or right to a moderate degree. Hydrotheca more or less tubular, largely free, slightly narrowing distally, aperture circular, operculum two-flapped. Total length of hydrotheca 300-400 ?m; greatest diameter 130-190 ?m; diameter at rim 80-140 ?m. Male and female gonothecae similar, elongated pear-shaped, narrowing proximally into short pedicel attaching gonothecae to internode of hydrocladium; aperture on short distal tube, rather wide. Length of gonothecae 1.2-1.7 mm; greatest diameter 550-700 ?m. Nematocysts: Not described in detail.
  • CORNELIUS P.F.S. (1995) North-West European Thecate Hydroids and their Medusae, 2. Synopses of the British Fauna (New Series) 50: VII, 1-386.

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Size

Full grown colonies may reach a length of 650 mm; usually much smaller.
  • CORNELIUS P.F.S. (1995) North-West European Thecate Hydroids and their Medusae, 2. Synopses of the British Fauna (New Series) 50: VII, 1-386.

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Ecology

Habitat

Depth range based on 33 specimens in 1 taxon.
Water temperature and chemistry ranges based on 5 samples.

Environmental ranges
  Depth range (m): 5 - 70
  Temperature range (°C): -0.262 - 3.587
  Nitrate (umol/L): 0.923 - 2.191
  Salinity (PPS): 27.165 - 32.286
  Oxygen (ml/l): 7.160 - 8.208
  Phosphate (umol/l): 0.057 - 0.239
  Silicate (umol/l): 5.352 - 8.544

Graphical representation

Depth range (m): 5 - 70

Temperature range (°C): -0.262 - 3.587

Nitrate (umol/L): 0.923 - 2.191

Salinity (PPS): 27.165 - 32.286

Oxygen (ml/l): 7.160 - 8.208

Phosphate (umol/l): 0.057 - 0.239

Silicate (umol/l): 5.352 - 8.544
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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A typical species of tide swept, sand-scoured sites, attached to stones, boulders, wrecks and bedrock.
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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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