Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, 370 05, České Budějovice, Czech Republic.
Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, MA, 02543, USA.
Syst Parasitol. 2023 Dec 18;101(1):2. doi: 10.1007/s11230-023-10130-3.
Examinations of some deep-sea hydrothermal vent fishes from the western and eastern regions of the Pacific Ocean revealed the presence of three new species of Ascarophis van Beneden, 1871 (Nematoda: Cystidicolidae), all gastrointestinal parasites, namely: A. justinei n. sp. from Thermarces cerberus Rosenblatt & Cohen (type host) and Thermichthys hollisi Cohen, Rosemblatt & Moser (both Zoarcidae, Perciformes) and A. globuligera n. sp. from T. cerberus from the Northern East Pacific Rise, and A. monofilamentosa n. sp. from Pyrolicus manusanus Machida & Hashimoto (Zoarcidae, Perciformes) from the Manus Basin near Papua New Guinea. Specimens are described and illustrated based on light and scanning electron microscopical examinations. In addition to other morphological differences, all the three new species differ from each other by the structure of eggs: eggs bearing a lateral superficial swelling (A. globuligera n. sp.), eggs with one conspicuously long filament on one pole (A. monofilamentosa n. sp.) and eggs smooth, without any filaments or swellings (A. justinei n. sp.). The egg morphology of the two first-named species is unique within all species of Ascarophis, which indicates that all the three newly described species of Ascarophis are probably endemic to the respective hydrothermal vents as their fish hosts.
对来自太平洋西部和东部地区的一些深海热液喷口鱼类的检查揭示了三种新的 Ascaphis 属寄生虫（线虫科：Cystidicolidae），均为胃肠道寄生虫，分别是：来自 Thermarces cerberus Rosenblatt & Cohen（模式宿主）和 Thermichthys hollisi Cohen、Rosenblatt & Moser（均为 Zoarcidae，鲈形目）的新种 Ascarophis justinei n. sp.；来自北太平洋东部洋脊的 Thermarces cerberus 的新种 Ascarophis globuligera n. sp.；以及来自巴布亚新几内亚附近的 Manus 盆地的 Pyrolicus manusanus Machida & Hashimoto（Zoarcidae，鲈形目）的新种 Ascarophis monofilamentosa n. sp。基于光镜和扫描电子显微镜检查，对标本进行了描述和说明。除了其他形态差异外，所有这三种新种在卵的结构上也彼此不同：具有侧面表面肿胀的卵（A. globuligera n. sp.）、在一个极上具有一个明显长丝的卵（A. monofilamentosa n. sp.）和光滑的卵，没有任何细丝或肿胀（A. justinei n. sp.）。前两个命名物种的卵形态在所有 Ascaphis 属物种中都是独特的，这表明这三种新描述的 Ascaphis 物种可能是各自热液喷口鱼类宿主的特有种。
