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      A giant new species of Enchiridium (Polycladida, Prosthiostomidae) from southwestern Japan

      , 1 , 2

      ZooKeys

      Pensoft Publishers

      Cotylea , marine flatworm, phylogeny, Platyhelminthes , taxonomy

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          Abstract

          Abstract

          We describe a new species of polyclad flatworm, Enchiridium daidai sp. nov., from the rocky subtidal zone in the East China Sea along the coasts of the Kyushu and Okinawa Islands, Japan. Enchiridium daidai sp. nov. is characterized by i) the entire periphery of the dorsal surface narrowly fringed with orange, ii) a marginal-eyespot band extending to the position of the mouth (about anterior one-eighth of body), and iii) two prostatic vesicles covered by a common muscle sheath, which is penetrated by the ejaculatory duct. We performed a molecular phylogenetic analysis based on 945-bp 28S rDNA sequences of 16 species of Prosthiostomidae currently available in public databases in addition to those of E. daidai sp. nov. and Prosthiostomum torquatum Tsuyuki et al., 2019. In the resulting tree, our new species was nested in a clade composed of Enchiridium species. The tree topology was in favor of a taxonomic view that Enchiridium should be defined by having i) a common muscle sheath that encloses two prostatic vesicles and ii) marginal eyespots that may or may not surround the periphery of the dorsal surface.

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          Most cited references 28

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          Taxonomy and life history of the Acropora-eating flatworm Amakusaplana acroporae nov. sp. (Polycladida: Prosthiostomidae)

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            Characterization of the complete mitochondrial genomes from Polycladida (Platyhelminthes) using next-generation sequencing.

            The complete mitochondrial genomes of three polycladids, the acotylean Hoploplana elisabelloi and the cotyleans Enchiridium sp. and Prosthiostomum siphunculus have been assembled with high coverage from Illumina sequencing data. The mt genomes contain 36 genes including 12 of the 13 protein-coding genes characteristic for metazoan mitochondrial genomes, two ribosomal RNA genes, and 22 transfer RNA genes. Gene annotation, gene order, genetic code, start and stop codons and codon bias have been identified. In comparison with the well investigated parasitic Neodermata, our analysis reveals a great diversity of gene orders within Polycladida and Platyhelminthes in general. By analyzing representative genomes of the main groups of Platyhelminthes we explored the phylogenetic relationships of this group. The phylogenetic analyses strongly supported the monophyly of Polycladida, and based on a small taxon sampling suggest the monophyly of Acotylea and Cotylea.
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              Turbellaria brasileiros (8). Boletins Da Faculdade de Philosophia, Sciencias e Letras, Universidade de São Paulo

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                Author and article information

                Contributors
                Journal
                Zookeys
                Zookeys
                2
                urn:lsid:arphahub.com:pub:45048D35-BB1D-5CE8-9668-537E44BD4C7E
                urn:lsid:zoobank.org:pub:91BD42D4-90F1-4B45-9350-EEF175B1727A
                ZooKeys
                Pensoft Publishers
                1313-2989
                1313-2970
                2020
                12 March 2020
                : 918
                : 15-28
                Affiliations
                [1 ] Graduate School of Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan Hokkaido University Sapporo Japan
                [2 ] Faculty of Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan Hokkaido University Sapporo Japan
                Author notes
                Corresponding author: Aoi Tsuyuki ( tykamsp0430@ 123456gmail.com )

                Academic editor: Tom Artois

                Article
                47061
                10.3897/zookeys.918.47061
                7082371
                Aoi Tsuyuki, Hiroshi Kajihara

                This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                Categories
                Research Article
                Polycladida
                Turbellaria
                Phylogeny
                Taxonomy
                Japan

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