Fig. 2

Molecular phylogenetic tree of choanoflagellates based on a concatenated dataset of small and large subunit rDNA, hsp90, and tubA genes. The choanoflagellata form a sister group to metazoa and divided into two main clusters: the Craspedida including the naked and thecate, marine and freshwater forms, and the Acanthoecida—marine loricate forms. (After Ref. [22])