Hydra vulgaris
Fig. 37: Freshwater polyps (hydra vulgaris) — Nikon D200, Nikkor AF-S VR Micro 105mm, 2 x Sea&Sea YS-110α, Lake Zug, Fischchratte, 26. Mai 2013 Nikon D200; Δt=1/250 s; f=105 mm; f/29.0; ISO 100; 26 May 2013 09:52:02