目的:本文旨在描述Plenivitellinumkifin.gen。,n.sp.(Digenea:Azygiidae)感染非洲虎鱼的胃肠道,水猴,1861(Characiformes:alestidae)在卡万戈河,纳米比亚。我们修改了绿鹤的诊断,1909年适应这个新物种。
方法:蠕虫被热杀死,固定在10%中性缓冲福尔马林中,VanCleave和Ehrlich的humoxylins染色,在丁香油中清除,并使用加拿大香脂安装在载玻片上。
结果:新的偶合动物类似于耳造口斯塔福德的物种,1904年有一个细长的身体,比口腔吸盘宽的腹侧吸盘,位于身体的前半部,睾丸前卵巢,主要占据卵巢和腹侧吸盘之间盲肠间隙的子宫,和一个限制在后体且在睾丸后区域向后汇合的卵黄。新属与所有Azygiidae物种的不同之处在于其腹侧吸盘的组合比口腔吸盘宽(与较窄),一个细长的前列腺囊,向后延伸到腹侧吸盘的后缘附近(vs.卵形前列腺囊完全在腹侧吸盘的前缘前方或略微重叠),一种几乎填满睾丸后空间并向后延伸超过盲肠尖端的卵黄(与后部分离或限制在睾丸后空间的前半部,并且不会向后延伸超过盲肠尖端)的卵黄,和I形排泄膀胱(vs.Y形)。
结论:本研究记录了来自非洲的无菌类动物的第一个记录和感染特征鱼的无菌类动物的第一个记录。
OBJECTIVE: This paper aims to describe Plenivitellinum kifi n. gen., n. sp. (Digenea: Azygiidae) infecting the gastrointestinal tract of the African tigerfish, Hydrocynus vittatus Castelnau, 1861 (Characiformes: Alestidae) in the Kavango River, Namibia. We revise the diagnosis of Azygiidae Lühe, 1909 to accommodate this new species.
METHODS: The worm was heat-killed, fixed in 10% neutral buffered formalin, stained in Van Cleave\'s and Ehrlich\'s hematoxylins, cleared in clove oil, and mounted on glass slide using Canada balsam.
RESULTS: The new azygiid resembles species of Otodistomum Stafford, 1904 by having an elongate body, a ventral sucker that is wider than the oral sucker and that is in the anterior half of the body, a pre-testicular ovary, a uterus that primarily occupies the inter-caecal space between the ovary and the ventral sucker, and a vitellarium that is restricted to the hindbody and that is confluent posteriorly in the post-testicular region. The new genus differs from all species of Azygiidae by having the combination of a ventral sucker that is wider than the oral sucker (vs. narrower), an elongate prostatic sac that extends posteriad to near the posterior margin of the ventral sucker (vs. an ovoid prostatic sac that is wholly anterior to or slightly overlaps the anterior margin of the ventral sucker), a vitellarium that nearly fills the post-testicular space and that extends posteriad beyond the caecal tips (vs. a vitellarium that is separate posteriorly or that is restricted to the anterior half of the post-testicular space and does not extend posteriad beyond the caecal tips), and an I-shaped excretory bladder (vs. Y-shaped).
CONCLUSIONS: This study documents the first record of an azygiid from Africa and the first record of an azygiid infecting a characiform fish.