This web site was created within Arctic Ocean Diversity (ArcOD) project
and was financially supported by Polish Ministry of Science (project number: DPN/N63/AODP/2009).

Nephasoma diaphanes diaphanes (Gerould, 1913)

A cosmopolitan species - the most common sipunculan in deep-sea communities

Nephasoma diaphanes diaphanes in foraminiferan test

Nephasoma diaphanes scattered_hooks
Phascolosoma diaphanes Gerould, 1913
Golfingia diaphanes E. Cutler and Cutler, 1980

Distinguishing characteristics
Two retractors.
Transparent or translucent body wall.
Introvert shorter than the trunk with a few short tentacular lobes.
Scattered, spinelike hooks.
Immature specimens of other Nephasoma species might be (and very often are so the literature is full of unavoidable noise on this issue) easily mistaken with N. diaphanes.

Common trunk length: 5 mm
Maximum trunk length: 55 mm

Whitish, transparent or translucent body wall

It inhabits sand, silt, clay and mud

Deposit feeder

Life cycle
Dioecious, probably trochophore larva

More Biology & Ecology
It often lives in foraminiferan tests or small polychaete tubes. Larger shelter dwellers may have enlarged and darker posterior papillae. It is often the most common sipunculan in the deep water communities.

Both sides of the northern Atlantic. Present from the wide range of bathymetric distribution; Very common in deep-sea communities.