25-30 m. [details]
English Channel, France (Brittany). [details]
The specific epithet makes reference to the similarity of the species with Pionosyllis weismanni Langerhans, 1879. [details]
In coarse sand with Clausinella fasciata (da Costa, 1778) and Branchiostoma lanceolatum (Pallas, 1774). [details]
Dauvin & Lee (1983) strangely did use the incorrect epithet formulation of 'prope-weismanni' throughout, as written ... [details]
France, Brittany, Baie de Morlaix, 1 mile NW Pointe de Primel (geocoordinates not provided but estimated with ... [details]