Pterastericola psilastericola (Jespersen & Luetzen, 1972) Jondelius, 1992

Locality. Loc. 3.

Known distribution. Northern Atlantic, Norway (Jespersen & Luetzen 1972). Material. Four specimens studied alive and fixed in ethanol for future DNA extraction. Description and remarks. No specimens were preserved as whole mounts but the identification is confirmed based on the presence of an ophistaptor, absence of ciliation over most of the body and the fact that it is the only species known to live as a symbiont in the pyloric caeca of the starfish Psilaster andromeda (see Jondelius 1992).