Overview

Comprehensive Description

Type Material

Type: Zoologische Institut Zoologisches Museum, Universitat von Hamburg, Hamburg, ZMUH (Cutler, 1985).

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Source: Sipuncula LifeDesk

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Type Locality

Uea, Wallis Island, Pacific Ocean (Stephen and Edmonds, 1972).

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Source: Sipuncula LifeDesk

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General Description

This species is sometimes confused with S. nudus, but the free nephridia, a different number of LMBs, and the characteristic digitate processes of the brain are distinguishing characters of S. robustus.

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Source: Sipuncula LifeDesk

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Distribution

This species is found in warm shallow waters in the Indo-West Pacific Ocean, Red Sea, and Caribbean.

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Source: Sipuncula LifeDesk

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Physical Description

Morphology

(From Stephen and Edmonds, 1972; Cutler and Cutler, 1985 and Cutler, 1994).

Introvert shorter than the trunk, with triangular papillae covering the surface.

Trunk is cylindrical and the surface is divided into a large number of small rectangles by the intersection of the longitudinal and circular muscles.

Internal anatomy

26-30 longitudinal muscle bands, usually 28-29.

A pair of free nephridia.

Brain with long and stringy lateral processes.

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Source: Sipuncula LifeDesk

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Look Alikes

Similar Species

This species is similar to Sipunculus nudus, however it is differentiated by the number of LMBs, the free nephridia, and the lateral long stringy brain processes. Cutler and Cutler (1985) believe that over the years S. robustus has been mistakenly identified as S. nudus and vice versa.

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Ecology

Habitat

coastal
  • UNESCO-IOC Register of Marine Organisms
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Source: World Register of Marine Species

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Depth range based on 17 specimens in 1 taxon.
Water temperature and chemistry ranges based on 7 samples.

Environmental ranges
  Depth range (m): 58 - 2720
  Temperature range (°C): 2.470 - 14.350
  Nitrate (umol/L): 10.727 - 38.221
  Salinity (PPS): 34.715 - 35.241
  Oxygen (ml/l): 1.474 - 4.720
  Phosphate (umol/l): 0.840 - 2.764
  Silicate (umol/l): 6.492 - 93.239

Graphical representation

Depth range (m): 58 - 2720

Temperature range (°C): 2.470 - 14.350

Nitrate (umol/L): 10.727 - 38.221

Salinity (PPS): 34.715 - 35.241

Oxygen (ml/l): 1.474 - 4.720

Phosphate (umol/l): 0.840 - 2.764

Silicate (umol/l): 6.492 - 93.239
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Disclaimer

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