@ARTICLE{TreeBASE2Ref15052, author = {Allen G. Collins and Bastian Bentlage and George I. Matsumoto and Steven H. D. Haddock and Karen Osborn and Bernd Schierwater}, title = {Solution to the phylogenetic enigma of Tetraplatia, a worm-shaped cnidarian}, year = {2005}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Biology Letters}, volume = {}, number = {}, pages = {}, abstract = {Tetraplatia is a genus containing two species of pelagic cnidarians of curious morphology. Their vermiform shape and four swimming flaps are difficult to relate to the features of other cnidarians, thus obscuring their phylogenetic affinities. Since their discovery in the mid-1800s, a number of prominent cnidarian workers have weighed in on this conundrum, some arguing that they are aberrant hydrozoans and others concluding that they are unusual scyphozoans. Current taxonomic practice conforms to the latter view. However, data presented here from the large and small subunits of the nuclear ribosome leave little doubt that Tetraplatia is in fact a hydrozoan genus. Indeed, its precise phylogenetic position is within Narcomedusae, as some authors had previously deduced based on structural characters. The distinctive body plan of Tetraplatia is remarkable because it appears to have a recent origin, in contrast to the prevailing pattern of metazoan history.} }

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