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The position of Xenacoelomorpha in the tree of life remains a major unresolved question in the study of deep animal relationships… Expand Metazoa comprises 35–40 phyla that include some 1.3 million described species. Phylogenetic analyses of metazoan… Expand A clear picture of animal relationships is a prerequisite to understand how the morphological and ecological diversity of animals… Expand Molecular evidence suggests that Acoelomorpha, a proposed phylum composed of acoel and Nemertodermatida flatworms, are the most… Expand The origin of the bilaterian metazoans from radial ancestors is one of the biggest puzzles in animal evolution. A way to solve it… Expand The phylogenetic position of the phylum Platyhelminthes has been re–evaluated in the past decade by analysis of diverse molecular… Expand Bilateria are currently subdivided into three superclades: Deuterostomia, Ecdysozoa, and Lophotrochozoa. Within this new… Expand Triploblastic relationships were examined in the light of molecular and morphological evidence. Representatives for all… Expand Shared molecular genetic characteristics other than DNA and protein sequences can provide excellent sources of phylogenetic… Expand The taxa Nemertodermatida and Acoela have traditionally been considered closely related and classified as sister groups within… Expand