Stichopus monotuberculatus
Sea Cucumber - Stichopus sp.
Stichopus monotuberculatus
Stichopus monotuberculatus
Stichopus_monotuberculatus.dREU_00177.UF6329
© FloT974
Invertebrate · Echinoderms · Sea cucumber

Knobbly Sea Cucumber

Stichopus monotuberculatus (Quoy & Gaimard, 1834)
syn. Holothuria monotuberculata, Stichopus unituberculatus
up to 20 cm1-20 m
5

A beige, squarish sea cucumber to about 20 cm (8 in), its sides and back carrying rows of large wart-like tubercles that give the species its name. The body is smaller and paler than the related warty species, and the tubercles are blunter, though worn or sand-covered animals can be genuinely hard to tell apart underwater.

It occupies rubble and sand pockets among coral from about 1 m to 20 m (3 to 65 ft), tucked out of sight during the day and feeding over open surfaces after dark. Like the rest of its genus it has a body wall of mutable collagenous tissue, able to soften enough to flow into a crevice and stiffen again once inside, and it is correspondingly fragile in the hand. Identification within this group has been muddled for a long time, and several names in circulation cover more than one species; genetic work over the past two decades has begun to sort them out, which is why a photograph from this coast is worth keeping with a location and depth attached.

How to recognise it
  • beige body with large wart-like tubercles
  • squarish cross-section
  • tubercles arranged in rows along the sides
  • length up to 20 cm

Why it's threatened

Biological resource use
Intentional use: (subsistence/small scale) [harvest]

This species is fished throughout its range. Although not one of the most important species for fishery purposes, it can be expected that this species may become more popular after the depletion or reduction of other species of higher commercial importance and value.

Threat classification from the IUCN Red List.

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Last Update: August 8, 2026