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Phylogeny of thePlumularioidea(Hydrozoa,Leptothecata):evolution of colonialorganisation and lifecycle Lucas LeclèrePeter SchuchertMichaël Manuel2007 год

Phylogeny of the Plumularioidea (Hydrozoa, Leptothecata): evolution of colonial organisation and life cycle
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Аннотация: The Plumularioidea (Cnidaria, Hydrozoa, Leptothecata) are the most species rich superfamily of the class Hydrozoa. They display a complex and diversified colonial organisation and their life cycle comprises either a reduced free‐living, pelagic generation (medusoid), alternating with the benthic colonial form or in most species, no pelagic generation. In order to understand the evolution of colonial and life cycle characters among Plumularioidea, we have reconstructed their phylogeny. Partial mitochondrial 16S rRNA sequences and 64 morphological characters were analysed separately and in combination. The morphological data included not only characters of the individual polyps and medusae, but also characters describing the organisation of colonies, for which we propose general principles applying to character coding in modular organisms. The phylogenetic analyses supported the monophyly of Plumularioidea and of the four plumularioid families (Aglaopheniidae, Halopterididae, Kirchenpaueriidae and Plumulariidae). Most genera were paraphyletic or polyphyletic. This study highlights multiple morphological simplifications of the colonial organisation during the evolution of Plumularioidea and the convergence of the defensive polyps — the dactylozooids — of Plumularioidea with those of others Leptothecata ( Hydrodendron ) or Anthoathecata ( Hydractinia ). Concerning the evolution of the life cycle, the phylogeny supports a provocative scenario, where the medusa was lost in an ancestor of the Plumularioidea, and then re‐acquired four times independently within this group, in the form of simple medusoids.
Год издания: 2007
Авторы: Lucas Leclère, Peter Schuchert, Michaël Manuel
Издательство: Wiley
Источник: Zoologica Scripta
Ключевые слова: Marine Invertebrate Physiology and Ecology, Marine Ecology and Invasive Species, Marine Toxins and Detection Methods
Другие ссылки: Zoologica Scripta (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)