Phylogenetics of Trachylina (Cnidaria: Hydrozoa) with New Insights on the Evolution of Some Problematical Taxa Allen G
Journal of the Marine Biological Association of the United Kingdom, 2008, 88(8), 1673–1685. #2008 Marine Biological Association of the United Kingdom doi:10.1017/S0025315408001732 Printed in the United Kingdom Phylogenetics of Trachylina (Cnidaria: Hydrozoa) with new insights on the evolution of some problematical taxa allen g. collins1, bastian bentlage2, alberto lindner3, dhugal lindsay4, steven h.d. haddock5, gerhard jarms6, jon l. norenburg7, thomas jankowski8 and paulyn cartwright2 1NMFS, National Systematics Laboratory, National Museum of Natural History, MRC-153, Smithsonian Institution, PO Box 37012, Washington, DC 20013-7012, USA, 2Department of Ecology and Evolutionary Biology, University of Kansas, 1200 Sunnyside Avenue, Lawrence, KS 66045, USA, 3Centro de Biologia Marinha—USP–Rodovia Manoel Hipo´lito do Rego, Km 131, 5—Sa˜o Sebastia˜o, SP, Brazil, 4Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan, 5Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, CA 95039, USA, 6Biozentrum Grindel und Zoologisches Museum, Universita¨t Hamburg, Martin-Luther-King Platz 3, 20146 Hamburg, Germany, 7Smithsonian Institution, PO Box 37012, Invertebrate Zoology, NMNH, W-216, MRC163, Washington, DC 20013-7012, USA, 8Federal Institute of Aquatic Science and Technology, Du¨bendorf 8600, Switzerland Some of the most interesting and enigmatic cnidarians are classified within the hydrozoan subclass Trachylina. Despite being relatively depauperate in species richness, the clade contains four taxa typically accorded ordinal status: Actinulida, Limnomedusae, Narcomedusae and Trachymedusae. We bring molecular data (mitochondrial 16S and nuclear small and large subunit ribosomal genes) to bear on the question of phylogenetic relationships within Trachylina. Surprisingly, we find that a diminutive polyp form, Microhydrula limopsicola (classified within Limnomedusae) is actually a previously unknown life stage of a species of Stauromedusae.
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