Replication Data for: Ophidascaris arndti from Bothrops fonsecai and Akodon montensis

New hosts for a snake’s helminth: first report of intermediate and definitive hosts naturally infected by Ophidascaris arndti (Ascarididae) in the wild. We report the occurrence of adult nematodes of Ophidascaris arndti naturally infecting a new definitive host, the Fonseca’s lancehead Bothrops fonsecai, and third-stage larvae of O. arndti parasitizing a new intermediate host, the montane grass mouse Akodon montensis, 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 molecular analyses also supported the ‘arndti’, ‘filaria’, and ‘obconica’ groups as independent lineages, as well as supporting the allocation of Ophidascaris 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.