Generic interrelationships within the Spionidae (Annelida: Polychaeta) |
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Authors: | ELIN SIGVALDADÓ TTIR,REW S.Y. MACKIE,FREDRIK PLEIJEL |
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Affiliation: | Department of Zoology, Stockholm University, S-106 91 Stockholm, Sweden1;Department of Zoology, National Museum of Wales, Cathays Park, Cardiff CF13NP;Swedish Museum of Natural History, Box 50007, S-104 05 Stockholm, Sweden2 |
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Abstract: | The phylogenetic relationships of spionid genera are estimated from parsimony analyses of morphological characters, with Trochochaetidae, Poecilochaetidae and Uncispionidae as outgroups. A first analysis of currendy recognised genera proved inconclusive and even exclusion of six of the most polymorphic genera resulted in 13 305 equally parsimonious trees and a fully collapsed consensus tree. A second analysis using only the type species of each genus, yielded four equally parsimonious trees; reduced to two after successive weighting. The topologies of these two trees indicated division of the family into four main groups: (1) Aonidella and Xandaros; (2) Prionospio (sensu fato)-complex, Laonice, Spiophanes and Aonides; (3) a large assemblage of genera, including Polydora-{senm late), Scolelepis, Malacoceros and Spio; (4) Atherospio, Pseudatherospio and Pygospiopsis. Earlier literature classifications of the group are evaluated and compared with die new results. |
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Keywords: | cladistics systematics parsimony |
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