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Westheide, 1965

Description:
Body very small consisting of seven segments.
Prostomium rounded, without eyes. Antennae and palps absent. Post-peristomial and one posterior segment without parapodia. Prostomium, peristomium and each segment with a complete ring of cilia.
Parapodium subcylindrical, with one acicula. A conical dorsal cirrus present. No ventral cirri. Each parapodia with three simple finely toothed hooks; compound chaetae absent (P. psammophilus-parapodium).
Pygidium oval, with a small median cirrus and two minute papillae.
Mandibles and maxillae absent.

Size:
Up to 0.75 mm for seven segments.

Colour:
Milky white, sometimes with the greenish intestine visible.

Habitat:
Found interstitially in intertidal sand.

Distribution:
North Sea and eastern Atlantic (Arcachon).

Remarks:
Females with one egg. Males unknown.

Parapodrilus psammophilus