We wish to report the occurrence of adult nematodes (Ascarididae) naturally infecting a new definitive host, the Fonseca's lancehead (Viperidae), and third-stage larvae of parasitizing a new intermediate host, the montane grass mouse (Cricetidae), both found in the Atlantic Forest of the state of Rio de Janeiro, Brazil. We elucidated the morphological characteristics of both adults and larvae using light and scanning electron microscopy (SEM). Taxonomic affinities between larvae and adult worms were assessed using MT-CO1 gene sequences. Adult and larval gene sequences formed a well-supported clade and had low pairwise p-distances, suggesting that they are conspecific. Our phylogenies also supported the 'arndti', 'filaria', and 'obconica' groups as independent lineages and confirmed the allocation of within the family Ascarididae, although as an early offshoot. This is the first report of natural infection of this helminth's larvae in a wild intermediate host.
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| http://dx.doi.org/10.1016/j.ijppaw.2022.11.003 | DOI Listing |
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