Morphological characteristics and DNA sequencing were used to identify plerocercoids of a Schistocephalus sp. infecting slimy sculpin (Cottus cognatus) from northern New Brunswick and plerocercoids of Ligula intestinalis infecting blacknose dace (Rhinichthys atratulus) in Fundy National Park (FNP, New Brunswick). To our knowledge, no previous publications documented either cestode from New Brunswick, Canada. Blacknose dace represent a new host record for L. intestinalis. Identifications were made based on the presence or absence of segmentation and sequencing partial nicotinamide adenine dinucleotide dehydrogenase subunit 1 (ND1; mitochondrial DNA) and/or partial cytochrome c oxidase subunit 1 (COI; mitochondrial DNA). Plerocercoids from blacknose dace in FNP were identified as Ligula intestinalis based on >99% nucleotide identity with COI for this species in the NCBI GenBank database. Plerocercoids in slimy sculpin from northern New Brunswick were identified as a Schistocephalus sp. based on high nucleotide identity with congenerics in the NCBI GenBank database. The absence of GenBank entries with sufficient high percent identity to our specimens, and potential species hybrids in this genus, prevents species-level identification of Schistocephalus sp. plerocercoids currently. The absence of previous documentation of these cestodes might reflect recent environmental change promoting the transmission of these parasites that can modulate host fish behavior, induce sterility of host fishes, and contribute to epizootics.

利用形态特征和 DNA 测序来鉴定Schistocephalus sp. 的多尾蚴。来自新不伦瑞克省北部的粘稠杜父鱼 ( Cottus cognatus ) 和感染芬迪国家公园 (FNP, 新不伦瑞克省) 的黑鼻鲮鱼 ( Rhinichthys atratulus ) 的肠蠼螋。据我们所知，以前的出版物没有记录过来自加拿大新不伦瑞克省的这两种绦虫。黑鼻鲮鱼代表了肠乳杆菌的新宿主记录。根据部分烟酰胺腺嘌呤二核苷酸脱氢酶亚基 1（ ND1；线粒体 DNA）和/或部分细胞色素C氧化酶亚基 1（COI ；线粒体 DNA）的分段和测序的存在或不存在进行鉴定。基于与 NCBI GenBank 数据库中该物种的COI > 99% 的核苷酸同一性，FNP 中黑鼻鲮鱼的尾尾蚴被鉴定为Ligula Enteris 。来自新不伦瑞克省北部的粘稠杜父父鱼中的侧尾蚴被鉴定为裂头鱼属。基于与 NCBI GenBank 数据库中的同属物的高核苷酸同一性。由于缺乏与我们的标本具有足够高同一性的 GenBank 条目以及该属中潜在的物种杂交，因此无法对Schistocephalus sp. 进行物种水平的鉴定。目前有结尾蚴。先前对这些绦虫的记录的缺乏可能反映了最近的环境变化促进了这些寄生虫的传播，这些寄生虫可以调节宿主鱼的行为，诱导宿主鱼不育，并导致动物流行。