Overview

Distribution

In both periods Hesionura elongata was mainly observed in the open sea zone. In the area of the Flemish Banks and the Zeeland Banks the species mainly lives on the tops of the sandbanks. Further off the coast specimens are also found in the gullies between the banks. In comparison to the 1994-2001 period H. elongata had a high frequency of occurrence outside the near-coastal zone in the 1976-1986 period. This is probably mainly due to the difference in sampling technique: in the 1994-2001 period samples were sieved alive, as a result of which small bristle worms such as H. elongata had the opportunity to actively slip through the meshes of the sieve. In both periods a maximum density of 1,200 to 1,600 ind./m2 was reached.
  • Degraer S., J. Wittoeck, W. Appeltans, K. Cooreman, T. Deprez, H. Hillewaert, K. Hostens, J. Mees, E. Vanden Berghe & M. Vincx (2006). The macrobenthos atlas of the Belgian part of the North Sea. Belgian Science Policy. D/2005/1191/3. ISBN 90-810081-6-1. 164 pp.
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Source: World Register of Marine Species

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This species is also reported in the Bahamas.
Generally found between 0 - 50 m in fine sand to gravel.
  • Davoult, D.; Dewarumez, J.-M.; Luczak, C.; Migné, A. (1999). Nouvelles signalisations d'espèces benthiques sur les côtes françaises de la Manche orientale et de la Mer du Nord [New reports of benthic species from the french coasts of the eastern English Channel and the North Sea]. Cah. Biol. Mar. 40(2): 121-127
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

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Physical Description

Diagnostic Description

Description

Small bristle worm measuring up to 20 mm long. The head is clearly longer than wide with two pairs of antennae. The first segment is merged with the head; the second segment features 4 long tentacular cirri. The ventral cirri are longer than the parapodia.
  • Degraer S., J. Wittoeck, W. Appeltans, K. Cooreman, T. Deprez, H. Hillewaert, K. Hostens, J. Mees, E. Vanden Berghe & M. Vincx (2006). The macrobenthos atlas of the Belgian part of the North Sea. Belgian Science Policy. D/2005/1191/3. ISBN 90-810081-6-1. 164 pp.
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

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Ecology

Habitat

Hesionura elongata typically occurs in coarse-grained sediments: the maximum relative occurrence (> 30%) is observed in the coarsest sediments on the Belgian part of the North Sea (median grain size 600-650 µm). The mud content of the sediments is 20% maximally: the optimum is reached in sediments with a mud content ranging between 0 and 10%.
  • Degraer S., J. Wittoeck, W. Appeltans, K. Cooreman, T. Deprez, H. Hillewaert, K. Hostens, J. Mees, E. Vanden Berghe & M. Vincx (2006). The macrobenthos atlas of the Belgian part of the North Sea. Belgian Science Policy. D/2005/1191/3. ISBN 90-810081-6-1. 164 pp.
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

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Depth range based on 207 specimens in 1 taxon.
Water temperature and chemistry ranges based on 120 samples.

Environmental ranges
  Depth range (m): 0 - 150
  Temperature range (°C): 7.271 - 24.203
  Nitrate (umol/L): 0.793 - 11.774
  Salinity (PPS): 33.631 - 36.255
  Oxygen (ml/l): 4.454 - 6.417
  Phosphate (umol/l): 0.118 - 0.824
  Silicate (umol/l): 0.993 - 5.268

Graphical representation

Depth range (m): 0 - 150

Temperature range (°C): 7.271 - 24.203

Nitrate (umol/L): 0.793 - 11.774

Salinity (PPS): 33.631 - 36.255

Oxygen (ml/l): 4.454 - 6.417

Phosphate (umol/l): 0.118 - 0.824

Silicate (umol/l): 0.993 - 5.268
 
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