A new species of Trichuris Roederer, 1761 (Nematoda: Trichuridae) from Heteromys gaumeri Allen & Chapman (Rodentia: Heteromyidae) in Yucatan, Mexico

Abstract

In Mexico, four species of Trichuris Roederer, 1761 have been recorded in wild rodents belonging to the family Heteromyidae. In the present paper, we describe a new species based on specimens collected from Heteromys gaumeri Allen & Chapman (Heteromyidae: Heteromyinae) in the tropical forests of the Yucatan Peninsula, Mexico. Trichuris silviae n. sp. can be differentiated from the congeners described in North and South American rodents by morphological and morphometric features, such as the possession of a wide spicular tube, a thicker proximal cloacal tube, a shorter distal cloacal tube and a cylindrical spicular sheath. This is the first description of a Trichuris spp. from heteromyid rodents in Mexico and the fourth in North America. Despite the broad distribution of Heteromys spp., few cases of Trichuris infection have been reported. Further studies are necessary to verify if the new species is present in other heteromyid rodents in order to increase our knowledge about its geographical and host distribution.

Morphological and molecular characterization of Trichuris muris (Nematoda: Trichuridae): studies from two commensal rodent species

“…Trichuris muris was compared with 29 congeners described from North and South American rodents (Barker, 1915; Chandler, 1945, 1946; Tiner, 1950; Cameron & Reesal, 1951; Morini et al , 1955; Read, 1956; Frandsen & Grundmann, 1961; Todd & Lepp, 1972; Babero et al , 1975, 1976; Barus et al , 1975; Babero & Murua, 1987, 1990; Pfaffenberger & Best, 1989; Correa-Gomes et al , 1992; Suriano & Navone, 1994; Robles et al , 2006, 2014, 2018; Robles, 2011; Torres et al , 2011; Panti-May & Robles, 2016; Eberhardt et al , 2019; Falcón-Ordaz et al , 2020).…”

“…Among the 16 species with a spicular tube ( Trichuris opaca Barker & Noyes, 1915; Trichuris fossor Hall, 1916; Trichuris myocastoris Enigk, 1933; Trichuris citelli Chandler, 1945; Trichuris neotomae Chandler, 1945; Trichuris perognathi Chandler, 1945; Trichuris peromysci Chandler, 1946; Trichuris madisonensis Tiner, 1950; Trichuris dipodomis Read, 1956; Trichuris stansburyi Frandsen & Grundmann, 1961; Trichuris fulvi Babero & Murua, 1987; Trichuris laevitestis Suriano & Navone, 1994; Trichuris thrichomysi Torres, Nascimento, Menezes, Garcia, dos Santos, Maldonado Jr, Miranda, Lanfredi & de Souza, 2011; Trichuris silviae Panti-May & Robles, 2016; Trichuris cutillasae Eberhardt, Robles, Monje, Beldomenico & Callejón, 2019; and Trichuris guanacastei Falcón-Ordaz, Monzalvo-López & García-Prieto, 2020) different patterns can be observed.…”

New species of Trichuris (Nematoda: Trichuridae) parasitizing Heteromys salvini (Rodentia: Heteromyidae) from Costa Rica, with a key to Trichuris species described from Heteromyidae

“…Trichuris guanacastei n. sp. is the first species of Trichuris described in Costa Rica and the fifth species described in the Americas that parasitizes Heteromyidae (Chandler, 1945;Read, 1956;Pfaffenberger & Best, 1989;Panti-May & Robles, 2016). The new species was compared with 29 known species of Trichuris that infect rodents in the Braz J Vet Parasitol 2020; 29(2): e022019…”

“…sp., because the females of both species present a non-protrusive vulva; in the new species, the vulva is semi-protrusive. Additionally, the total body size and anterior end of the body of T. gracilis (38.5-39.6 and 21.55-27.44 mm, respectively) are larger than those in T. guanacastei (31.43-36.21 and 14.50-18.38 mm, respectively), and egg size of the new species (0.03 -0.05) is smaller than in that of T. dolichotis (0.075) (Robles, 2011;Panti-May & Robles, 2016). Fifteen species in the genus have a spicular tube similar to that of the new species: T. muris (Schrank, 1788) Hall, 1916, T. fossor Hall, 1916T.…”

“…differs from 12 of these 29 species (T. opaca Barker & Noyes, 1915; T. bradleyi Babero, Cattan & Cabello, 1975;T. chilensis Babero, Cattan & Cabello, 1976; T. elatoris Pfaffenberger & Robles, Cutillas & Callejón, 2018) by the presence of a spicular tube, while in the 12 referred species, the spicule lies entirely within the distal cloacal tube (Chandler, 1945;Tiner, 1950;Cameron & Reesal, 1951;Read, 1956;Frandsen & Grundmann, 1961;Todd & Lepp, 1972;Babero et al, 1975Babero et al, , 1976Barus et al, 1975;Babero & Murúa, 1987, 1990Pfaffenberger & Best, 1989;Correa-Gomes et al, 1992;Suriano & Navone, 1994;Robles et al, 2006Robles et al, , 2014Robles et al, , 2018Robles, 2011;Torres et al, 2011;Panti-May & Robles, 2016, Eberhardt et al, 2019.…”