Latest Articles from ZooKeys Latest 2 Articles from ZooKeys https://zookeys.pensoft.net/ Fri, 29 Mar 2024 03:10:15 +0200 Pensoft FeedCreator https://zookeys.pensoft.net/i/logo.jpg Latest Articles from ZooKeys https://zookeys.pensoft.net/ A giant new species of Enchiridium (Polycladida, Prosthiostomidae) from southwestern Japan https://zookeys.pensoft.net/article/47061/ ZooKeys 918: 15-28

DOI: 10.3897/zookeys.918.47061

Authors: Aoi Tsuyuki, Hiroshi Kajihara

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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Research Article Thu, 12 Mar 2020 16:43:45 +0200
Description of a new species of Paraplehnia (Polycladida, Stylochoidea) from Japan, with inference on the phylogenetic position of Plehniidae https://zookeys.pensoft.net/article/33955/ ZooKeys 864: 1-13

DOI: 10.3897/zookeys.864.33955

Authors: Yuki Oya, Taeko Kimura, Hiroshi Kajihara

Abstract: We describe a new species of polyclad flatworm, Paraplehnia seisuiae sp. nov., from 298–310 m depths in the Sea of Kumano, West Pacific, Japan. Paraplehnia seisuiae sp. nov. is characterized by i) a developed muscular wall proximally occupying about one-third of the prostatic vesicle, ii) no common duct between the spermiducal bulbs and the prostatic vesicle, and iii) a genital pit between the male and female gonopores. We provide a partial sequence (712 bp) of the mitochondrial cytochrome c oxidase subunit I gene as a DNA barcode for the species. Our phylogenetic analyses based on 603-bp 28S rDNA sequences indicate that P. seisuiae sp. nov. is nested in a clade consisting of stylochoid species along with unidentified species of Stylochus. It suggests that Plehniidae belongs to Stylochoidea, although this should be confirmed by future studies that contain Plehnia arctica (Plehn, 1896), the type species of the type genus of the family. The interfamily relationship among the superfamily Stylochoidea remains poorly resolved.

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Research Article Mon, 15 Jul 2019 09:24:34 +0300