Hydractinia echinata (Fleming, 1828)
Hermit crab fur - Ruwe zeerasp
Nearly all in association with Pagurus bernhardus (Common hermit crab - Gewone heremietkreeft)
Loch Creran, Scotland, 4-7-2017. Male specimens.Blokkendam, the Netherlands, 5-11-2011. Specimens A.
Heerenkeet - Flaauwers, the Netherlands, 12-10-2010.
Gülen - Dive Resort, Norway, 6-7-2023. Specimens B.
Sint-Annaland, the Netherlands, 8-4-2021. With Ammothea hilgendorfi (Pacific brown-banded sea-spider - Zebrazeespin).