We found Trichoplax at Portobello Marine Lab (University of Otago) in November 2019, using microscope slides suspended in a display tank. We tried to cultivate them but lost them during Covid-19 lockdown. Found another one today. In total we have found 4, all of them are about 100um in diameter. We have video which makes us confident that this is Trichoplax (not a giant marine amoeba). If we can trap more and/or breed this one we will do DNA analysis to confirm that it is Trichoplax and whether it is a known (e.g. adherens) or new species.
Collected from a glass slide suspended in an aquarium sand and aquatic vegetation for a few days.