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SourceID130024
NameCollins, A. G., Bentlage, B., Alberto Lindner, A., Lindsay, D., Haddock, S.H. D., Jarms, G., Norenburg, J. L., Jankowski, T., & Paulyn Cartwright, P. (2008) Phylogenetics of Trachylina (Cnidaria: Hydrozoa) with new insights on the evolution of some problematical taxa. Journal of the Marine Biological Association of the United Kingdom 88(8): 1673-1685.
Type Publication
AbstractSome 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. Our data confirm that the interstitial form Halammohydra sp. (Actinulida) is derived from holopelagic direct developing ancestors, likely within the trachymedusan family Rhopalonematidae. Trachymedusae is shown to be diphyletic, suggesting that the polyp stage has been lost independently at least two times within trachyline evolution. Narcomedusae is supported as a monophyletic group likely also arising from trachymedusan ancestors. Finally, some data, albeit limited, suggest that some trachyline species names refer to cryptic species that have yet to be sorted taxonomically.
Bibliographical
term
Phylogeny, Phylogenesis
Taxonomic
term
Hydrozoa
Taxa
(4)
Checked: verified by a taxonomic editorHydroidolina (additional source)
Checked: verified by a taxonomic editorTetraplatia Busch, 1851 (additional source)
Checked: verified by a taxonomic editorTetraplatidae Collins, Bentlage, Lindner, Lindsay, Haddock, Jarms, Norenburg, Jankowski & Cartwright, 2008 (original description)
Checked: verified by a taxonomic editorTrachylinae (redescription)
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2013-01-12 18:30:12Z  created  db_admin
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