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Multigene phylogenetic analysis reveals non-monophyly of Anisakis s.l. and (Nematoda: Anisakidae)
In: Parasitology International. Elsevier: Amsterdam. ISSN 1383-5769; e-ISSN 1873-0329
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| Trefwoorden |
Anisakinae Railliet & Henry, 1912 [WoRMS]; Pseudoterranova ceticola (Deardorff & Overstreet, 1981) Gibson & Colin, 1982 [WoRMS]; Skrjabinisakis Mozgovoi, 1951 [WoRMS]
Marien/Kust |
| Author keywords |
Aniskinae, Molecular phylogeny, Pseudoterranova ceticola, Skrjabinisakis, Systematics |
| Abstract |
The nematode genera Anisakis s.l. and Pseudoterranova (Anisakidae) include causative agents of anisakiasisand pseudoterranovosis, parasitic diseases resulting from eating undercooked or raw fish or squid. Species in both genera have thus attracted considerable attention especially in public health and taxonomic studies. The phylogenetic relationships of these genera within the subfamily Anisakinae, however, remain to be investigated with dense taxonomic sampling. In this study, we collected an anisakid third-stage larva, and identified it morphologically and molecularly as Pseudoterranova ceticola. Phylogeny of 15 anisakine species, including the newly collected specimen of Ps. ceticola, was reconstructed based on sequences of three mitochondrial (cox1, cox2, and 12S rRNA) and two nuclear (ITS and 28S rRNA) regions. The obtained tree suggested the non-monophyly of Anisakis s.l. and Pseudoterranova. Anisakis s.l. was divided into two groups, which are distinguished from each other by the shape of the ventriculus. Based on phylogenetic relationships and morphology, three species with a shorter ventriculus (“A.” brevispiculata, “A.” paggiae, and “A.” physeteris) were assigned to the genus Skrjabinisakis, as recently proposed. Pseudoterranova ceticola was distantly related to the monophyletic Ps. decipiens species complex. Although the phylogenetic position of the type species Ps. kogiae has not been investigated due to a lack of sequence data, this species may morphologically and ecologically resemble Ps. ceticola, inferring a close kinship between the two species. |
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