Cells of the protist choanoflagellate clade closely resemble sponge choanocyte cells. … The bilaterally symmetrical animals are further divided into deuterostomes (including chordates and echinoderms) and two distinct clades of protostomes (including ecdysozoans and lophotrochozoans) (Figure 2). How do choanoflagellates reproduce? With their characteristic collar surrounding the flagella, choanoflagellate cellsRead More →