Another group of animals discovered subsequently, whose filtering mechanism looked similar, was also included in "Bryozoa" until 1869, when the two groups were noted to be very different internally.
Kelompok lain hewan ditemukan kemudian, yang mekanisme penyaringannya tampak mirip, juga termasuk dalam "Bryozoa" sampai 1869, ketika dua kelompok diketahui sangat berbeda secara internal.