Abstract：
This study aimed to analyze helminth assemblage in Rhinella dorbignyi regarding host gender, size and mass in two sampling sites in southern Brazil, and to report new parasite associations. Anurans (n = 100) were collected in two localities from Rio Grande do Sul (RS) state, Brazil, from 2017 to 2020. Nineteen taxa (adults and larval forms) belonging to Nematoda, Acanthocephala, Digenea, and Cestoda were found in different infection sites. Cosmocercidae gen. spp., Physaloptera liophis, Catadiscus sp., and Cylindrotaenia americana were the dominant taxa in helminth assemblage. Female anurans showed higher helminth species richness than males considering the total sample (two localities) or one of the two localities. However, prevalence and mean intensity of infection did not show any significant difference between genders. Mean intensity of infection was significantly higher (19.52) in Laranjal locality. Host body size does not influence helminth abundance, as infections did not show significant correlation snout-vent length (SVL) nor body mass (BM) of anurans. The findings reveal anurans of R. dorbignyi may be intermediate, paratenic and definitive host for these parasites. Plagiorchioidea helminths (Digenea), Physaloptera liophis, larvae of Acuariidae and Spiroxys sp. (Nematoda), and cystacanth of Lueheia sp. (Acanthocephala) constitute new records for R. dorbignyi. Additionally, this is the first record of Cylindrotaenia americana larvae in this host species. Resulting information increases the knowledge on biodiversity and parasite-host relations and may help future conservation programs developed in ecosystems in the extreme south of Brazil.
摘要：
本研究旨在分析Rhinelladorbignyi的蠕虫组合与宿主性别的关系，巴西南部两个采样点的大小和质量，并报告新的寄生虫关联。Anurans（n=100）是从南里奥格兰德（RS）州的两个地方收集的，巴西,从2017年到2020年。属于Nematoda的19个分类群（成虫和幼虫形式），Acanthocephala,Digenea,在不同的感染部位发现了Cestoda.Cosmocercelcidaegen。Spp.,鱼翅目，Catadiscussp.,蠕虫组合中占主导地位的类群。考虑到总样本（两个地区）或两个地区之一，雌性无尾动物的蠕虫物种丰富度高于雄性。然而,患病率和平均感染强度在性别之间没有显着差异.拉兰贾尔地区的平均感染强度明显更高（19.52）。寄主身体大小不影响蠕虫丰度，因为感染未显示出无脑的鼻孔长度（SVL）和体重（BM）显着相关。研究结果表明，多比尼的无性系可能是中间的，这些寄生虫的寄生虫和确定宿主。Plagiorchioidea蠕虫（Digenea），鱼翅目，Acuariidae和Spiroxyssp。（线虫），和Lueheiasp。（Acanthocephala）构成了R.dorbignyi的新记录。此外,这是该寄主物种中美洲轮虫幼虫的第一个记录。由此产生的信息增加了有关生物多样性和寄生虫与宿主关系的知识，并可能有助于在巴西最南端的生态系统中制定未来的保护计划。
