Institute of Parasitology, Slovak Academy of Sciences, Hlinkova 3, 040 01Košice, Slovak Republic and University of Veterinary Medicine and Pharmacy, Košice, Slovak Republic.
Institute of Parasitology, Biology Centre of Academy of Sciences of Czech Republic and Faculty of Science, University of South Bohemia, Branišovská 31, 370 05České Budějovice, Czech Republic.
Parasitology. 2021 Aug;148(9):1040-1056. doi: 10.1017/S0031182021000743. Epub 2021 May 12.
Monozoic tapeworms (Caryophyllidea) are dominant components of parasite communities of suckers (Catostomidae) in North America, with Biacetabulum Hunter, 1927 representing one of the more species-rich genera. Molecular (28S rDNA) and morphological (including scanning electron microscopy and histology) evaluation of newly collected tapeworms from different fish hosts revealed the existence of four similar (and three closely related) species of Biacetabulum. These four species differ from their congeners by having a long body (up to 48 mm long) with a very long, slender neck (its length represents ≥30% of total body length), a large, globular scolex with a prominent central acetabulum-like loculus on the dorsal and ventral sides, two pairs of shallow lateral loculi and a distinct, slightly convex apical disc, and a cirrus-sac that is situated between the anterior arms of the ovarian wings. Taken together, the morphological and molecular data and the host associations of these species provide evidence of their host specificity. Biacetabulum isaureae n. sp. occurs in notch clip redhorse, Moxostoma collapsum, in South Carolina (USA), B. longicollum n. sp. in silver redhorse, Moxostoma anisurum (type host), and golden redhorse, M. erythrurum, in Manitoba (Canada) and West Virginia (USA), B. overstreeti n. sp. in a spotted sucker, Minytrema melanops, in Mississippi, and B. hypentelii n. sp. in northern hogsucker, Hypentelium nigricans, in Tennessee (USA). The new species differ from each other in the number of postovarian vitelline follicles, the posterior extent of preovarian vitelline follicles and relative size of the cirrus sac.
单殖吸虫（Caryophyllidea）是北美的吸盘鱼（Catostomidae）寄生虫群落的主要组成部分，其中 Biacetabulum Hunter，1927 是物种较为丰富的属之一。对来自不同鱼类宿主的新采集的绦虫进行分子（28S rDNA）和形态学（包括扫描电子显微镜和组织学）评估，揭示了存在四种相似（和三种密切相关）的 Biacetabulum 物种。这四种物种与其同属物种的区别在于其具有长体（长达 48 毫米）和非常长而细的颈部（其长度代表总体长的≥30％），大而球形的头节，在背侧和腹侧具有明显的中央似髋臼样小室，两对浅侧小室和明显略微凸起的顶端盘，以及位于卵巢翼前臂之间的旋前囊。综合这些形态和分子数据以及这些物种的宿主关联，为其宿主特异性提供了证据。Biacetabulum isaureae n. sp. 存在于南卡罗来纳州（美国）的缺口夹红马鱼，Moxostoma collapsum 中，B. longicollum n. sp. 存在于银红马鱼，Moxostoma anisurum（模式宿主）和金红马鱼，M. erythrurum 中，在马尼托巴省（加拿大）和西弗吉尼亚州（美国）和 B. overstreeti n. sp. 存在于斑点吸盘鱼，Minytrema melanops 中，在密西西比州，以及 B. hypentelii n. sp. 存在于北鲇鱼，Hypentelium nigricans 中，在田纳西州（美国）。新种之间在卵巢后卵黄滤泡的数量、卵巢前卵黄滤泡的后伸范围和旋前囊的相对大小上存在差异。
