Lungworms are a common finding in seals and fur seals around the world. However, from existing records, the biogeographical distribution of filaroid helminths appears to be restricted, and these parasites are endemic in only certain areas and species, mainly in the Northern Hemisphere. The occurrence of infection in pinniped species in the Southern Hemisphere is scarce. The objective of this work is to verify the prevalence of lungworms in Arctocephalus australis in waters off the southern coast of Brazil. Twenty subadult specimens of A. australis found recently dead on the southern coast of Brazil were necropsied and their lungs were examined. Parasitic cysts were found in only one specimen (prevalence of 5%). The helminths were morphologically identified as Parafilaroides normani (Metastrongyloidea: Filaroididae). This helminth species has been reported in pinnipeds from Australia, New Zealand and South Africa. This is the first record of P. normani in A. australis and for the western South Atlantic, providing additional data regarding the biogeographic distribution of the parasite.

中文翻译：

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Parafilaroides normani (Nematoda: Filaroididae) Dailey 的新宿主和地理记录，2009 年在来自巴西南部的南美海狗 Arctocephalus australis

肺虫在世界各地的海豹和海狗中很常见。然而，从现有记录来看，丝状蠕虫的生物地理分布似乎受到限制，这些寄生虫仅在某些地区和物种中特有，主要在北半球。南半球鳍足类动物感染的发生很少。这项工作的目的是验证肺虫的流行情况南头牛在巴西南部海岸附近的海域。二十个亚成体标本A. australis最近在巴西南部海岸发现的尸体进行了尸检，并检查了他们的肺部。仅在一个样本中发现了寄生虫囊肿（患病率为 5%）。蠕虫在形态上被鉴定为Parafilaroides normani（Metastrongyloidea：Filaroididae）。这种蠕虫物种已在澳大利亚、新西兰和南非的鳍足类动物中发现。这是第一个记录P.normani在A. australis对于南大西洋西部，提供有关寄生虫生物地理分布的额外数据。