Bryozoans. Brightfield illuminated light micrograph of a section through a group of moss animals (phylum Bryozoa), showing their tentacles (feather-like). Bryozoa are tiny filter-feeding invertebrate animals that sieve food particles out of the water using retractable lophophores, crowns of tentacles lined with cilia (hair-like). Magnification: x40 when printed at 10 centimetres wide.