Order: Hydroider (Hydroidea)

Species	Localities	Observations	Num. images	Last observation
Hydra sp.	13	14		1992-06-12
Hydroider (Hydroidea indet.)	4	16	1	2014-10-15
Tanghydroide (Dynamena pumila)	2	2		2002-11-07
Laomedea sp.	1	6		2001-06-11
Sikksakkhår (Laomedea flexuosa)	1	1		2002-11-07