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(Alder and Hancock, 1848)


External appearance
Solitary. Body globular to ovoid, up to 20 mm in diameter. Test thin, bearing numerous fibrils with adhering sand, mud, shells, etc.

Oral siphon 6-lobed; atrial siphon 4-lobed. Siphons placed close together. About 32 branched branchial tentacles of variable sizes. Branchial sac with 8 rows of curved and spirally arranged stigmata; no folds; 7 internal longitudinal bars on each side. Gut left of branchial sac; stomach narrow and small, not marked off from rest of gut, bearing many diverticula forming a complex liver. Only one gonad, placed on left side; consisting of a tubular ovary and marginal male follicles (E. arenosa morphology).

Unattached on sand or mud; from shallow water down to about 150 metres.

From Norway down to the English Channel.

Eugyra arenosa