New species of Hassalstrongylus (Trichostrongyloidea: Heligmonellidae) in the large-headed rice rat Hylaeamys seuanezi, in the Atlantic Forest of northeast Brazil

Abstract

A new species of Trichostrongyloidea (Nematoda: Heligmonellidae), Hassalstrongylus lauroi n. sp., is described from specimens collected from the small intestine of the rodent Hylaeamys seuanezi in the Atlantic Forest of northeastern Brazil (Igrapiúna, state of Bahia). The genus Hassalstrongylus includes 17 species, which parasitize rodents occurring in the Neotropical and Nearctic regions. It differs from the genus Stilestrongylus through its smaller number of ridges in the synlophe and through the size of the genital cone. The main taxonomic characteristics of this new species are the subsymmetrical caudal bursa of type 2-2-1, ray 8 branching out at the base of the dorsal trunk, right lobe smaller than the left, and rays 4 and 5 of robust nature. In addition, the ornamental ray 5 and the robustness of ray 4 on the male caudal bursa, along with the modification of the ridges of the posterior end of the female, allow us to consider the specimens found to be a new species.

Helminths of sigmodontine rodents in an agroforestry mosaic in the Brazilian Atlantic Forest: Patterns and processes of the metacommunity structure

“…The nematodes found were Syphacia carlitosi Robles and Navone, 2007, Syphacia hugoti Robles, Panisse and Navone, 2014, Syphacia sp. (Seurat 1916), Stilestrongylus eta (Travassos, 1937) Durette-Desset, 1971, Stilestrongylus sp., Hassalstrongylus epsilon (Travassos, 1937) Durette-Desset, 1971, Hassalstrongylus lauroi Costa et al, 2021 , Protospirura numidica criceticola Quentin, Karimi and Rodriguez de Almeida, 1968, Nematomystes scapteromi (Ganzorig, Oku, Okamoto, Malgor and Kamiya, 1999) and Physaloptera sp. The cestodes found were Raillietina sp.…”