Lacy bryozoans, one more common thing I rarely get to see, except while diving.
The Bryozoa, also known as Ectoprocta, are a phylum of aquatic animals, typically about 0.5 millimetres (0.020 in) long, that sieve food particles out of the water using a retractable lophophore, a "crown" of tentacles lined with cilia. Most marine species live in tropical waters, but a few occur in oceanic trenches and others round the poles. One class lives only in a variety of freshwater environments, and a few members of a mostly marine class prefer brackish...
