Phylogenetic position of Polymorphus phippsi Kostylew, 1922 and Polymorphus magnus Skrjabin, 1913 (Palaeacanthocephala, Polymorphidae) ascertained on the basis of molecular data

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Polymorphidae is a family of acanthocephalans, obligatory parasites with a complex life cycle involving arthropods as intermediate hosts and vertebrates of different taxa as definitive hosts. The current taxonomy of Polymorphidae seems to be equivocal. Its type genus Polymorphus has been shown to be polyphyletic based on molecular data. We obtained partial sequences of 28S rDNA gene and cox1 mitochondrial gene of two species of this genus, Polymorphus phippsi and P. magnus, and used them in a reconstruction of the polymorphid phylogeny. As a result, P. magnus was included into the same clade as the type species of the genus, P. minutus, while P. phippsi appeared to be close to Profilicollis spp. The position of P. phippsi agrees with the polyphyly of Polymorphus but does not correspond to its taxonomic status based on described phenotypic characters.

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作者简介

A. Diumina

Zoological Istitute of Russian Academy of Sciences

编辑信件的主要联系方式.
Email: aleksandra.diumina@zin.ru
俄罗斯联邦, Universitetskaya emb., 1, Saint-Petersburg, 199034

K. Galaktionov

Zoological Istitute of Russian Academy of Sciences

Email: kirill.galaktionov@zin.ru
俄罗斯联邦, Universitetskaya emb., 1, Saint-Petersburg, 199034

G. Atrashkevich

Institute of the Biological Problems of the North Far East Branch of Russian Academy of Sciences

Email: gatr@ibpn.ru
俄罗斯联邦, Portovaya str., 18, Magadan, 685000

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2. Figure 1. Phylogenetic relationships inferred from combined 28S rDNA + COI data set. Numbers near internal nodes show ML/MP bootstrap clade frequencies (percents) and posterior probabilities clade frequencies (percents). Clade containing Polymorphus phippsi sequences is highlighted in violet and Polymorphus magnus – in blue.

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