Graduate School of Science, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan.
Syst Parasitol. 2020 Dec;97(6):681-690. doi: 10.1007/s11230-020-09941-5. Epub 2020 Sep 30.
Three species of Dioncopseudobenedenia Yamaguti, 1965 (Monogenea: Capsalidae: Benedeniinae) have been described, all found parasitising Naso spp. (Acanthuridae) and Siganus lineatus (Siganidae), in Hawaii, the Great Barrier Reef, and New Caledonia in the Pacific. In this paper, D. elongata n. sp. is described, found parasitising the gills of N. unicornis (Forsskål) caught off Okinawa-jima Island. Dioncopseudobenedenia kala Yamaguti, 1965 is also reported, found parasitising the gills of N. unicornis, and those of a new host, the common dolphinfish Coryphaena hippurus Linnaeus (Coryphaenidae), off Okinawa and Kochi prefectures, Japan. The new species differed from known species in both nuclear (28S rDNA and ITS1-5.8S-ITS2) and mitochondrial DNA (cox1) sequences. Morphologically, the new species differed from other species of Dioncopseudobenedenia in possessing a longer accessory sclerite and a thick, short penis. No species of Dioncopseudobenedenia have been detected during past examinations of C. hippurus; this instance was probably an accidental infection. A key for identification of the species of Dioncopseudobenedenia is also provided herein.
三种 Dioncopseudobenedenia Yamaguti, 1965（单殖吸虫目：Capsalidae：Benedeniinae）已被描述，均寄生在夏威夷、大堡礁和新喀里多尼亚的 Naso spp.（刺尾鱼科）和 Siganus lineatus（鲷科）中。本文描述了一种新种，Dioncopseudobenedenia elongata n. sp.，发现寄生在冲绳岛捕获的 unicornis Naso unicornis（Forsskål）的鳃上。Dioncopseudobenedenia kala Yamaguti, 1965 也被报道寄生在 unicornis Naso unicornis 的鳃上，以及日本冲绳和高知县的新宿主，Coryphaena hippurus Linnaeus（Coryphaenidae）的鳃上。新种在核（28S rDNA 和 ITS1-5.8S-ITS2）和线粒体 DNA（cox1）序列上与已知种不同。形态上，新种与 Dioncopseudobenedenia 的其他种不同，具有更长的附件骨片和厚而短的阴茎。在过去对 Coryphaena hippurus 的检查中没有发现 Dioncopseudobenedenia 的任何物种；这种情况可能是偶然感染。本文还提供了 Dioncopseudobenedenia 种的鉴定钥匙。
