A new heligmonellid (Nematoda) species of the genus Stilestrongylus in Euryoryzomys russatus (Rodentia: Sigmodontinae) in the Atlantic Forest, southern Brazil

Abstract

A new species of Nippostrongylinae (Nematoda: Heligmonellidae), Stilestrongylus rolandoi n. sp., is described from specimens collected from the small intestine of the rodent Euryoryzomys russatus in the Atlantic Forest (Santo Amaro da Imperatriz, Santa Catarina state, southern Brazil). The genus Stilestrongylus includes 23 species, which parasitize rodents occurring in the Neotropical region. Stilestrongylus aureus (Durette-Desset & Sutton, 1985) from Argentina, S. azarai (Durette-Desset & Sutton, 1985) from Argentina, S. flavescens (Sutton & Durette-Desset, 1991) from Uruguay, S. franciscanus (Digiani & Durette-Desset, 2002) from Argentina, S. gracielae (Digiani & Durette-Desset, 2006) from Argentina, and S. oryzomysi (Sutton & Durette-Desset, 1991) from Argentina are closely related to Stilestrongylus rolandoi n. sp., all having caudal bursa patterns of types 1-4 in one of the lobes. Stilestrongylus rolandoi n. sp. is distinguished from the aforementioned species by its ray 6 being short in relation to rays 4 and 5, which are long and robust, and by having caudal bursa patterns of types 1-4 in both lobes. The new species has 27 ridges in the mid-body in males, and 24 in females, and has one of the highest ratios of spicule length to body length (21-33%) in this genus.

Helminth Community Structure of Three Sigmodontine Rodents in the Atlantic Forest, Southern Brazil

“…Simões et al (2011) and Cardoso et al (2018) reported high prevalence values (> 40 %) of S. lanfrediae in this rodent in preserved and fragmented areas. The genus Stilestrongylus usually presents high prevalence, abundance and dominance in helminth communities of rodents (Simões et al 2011, Boullosa et al 2019, as observed in the present study. Simões et al (2011) described the first records of S. lanfrediae in the rodents A. montensis and A. cursor in the state of Rio de Janeiro.…”

“…The helminth species found in this study had previously been reported in sigmodontine rodents by Gomes et al (2003), Simões et al (2011), Kuhnen et al (2012), Panisse et al (2017) and Cardoso et al (2018), except for S. rolandoi. This species, found in the rodent E. russatus, was previously described in Boullosa et al (2019). Helminth species richness and species composition differed among the three rodents collected in the study area.…”

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

“…Considering the occurrence of the genus Stilestrongylus in E. russatus , four species of this genus were reported for this host, S. rolandoi, S. lanfrediae, S. kaaguyporai and S. evaginata ( Boullosa et al, 2019 ; Panisse and Digiani, 2018 ). The genus Syphacia was observed for this host by Kuhnen et al (2012) .…”

Functional traits shape small mammal-helminth network: patterns and processes in species interactions

“…The genus Stilestrongylus is a common parasite group of sigmodontine rodents and has a strong coevolutionary history with these hosts (Simões et al ., 2011 ). Sigmodontine rodents infected by Stilestrongylus have been widely reported by several studies in different environments (Simões et al ., 2011 ; Panisse et al ., 2017 ; Boullosa et al ., 2019 ).…”