Abstract
The re-examination of nematodes collected decades ago from a spiny rat, Proechimys roberti (Echimyidae) from Pará State, revealed the presence of Acanthostrongylus acanthostrongylus Travassos, 1937, and two coparasitic species of Pudica (Heligmonellidae: Pudicinae), one of them new to science. Pudica minima n. sp. mostly resembles Pudica tenua Durette-Desset, 1970, described from Proechimys semispinosus in Colombia. Nevertheless, it differs from P. tenua by having a synlophe with 12 ridges with poorly developed careen, bursal pattern of type 2-2-1 on the right lobe, bursal rays 2 and 3 similar in length, and spicules longer with spoon-shaped tips. Pudica evandroi (Travassos, 1937) was already described from Pr. roberti but its synlophe remained undescribed and the original description lacked some details. A detailed study of the synlophe is provided and the range of morphometric data for males and females is enlarged. The study of the synlophe allowed ratifying the placement of this species within Pudica, as early suggested by previous authors. The species list and identification key to species of Pudica are updated with the inclusion of three species. The status of Heligmosomum alpha Travassos, 1918, which was transferred to Pudica in 1990, is emended and the species is considered a Nippostrongylinae incertae sedis.
Highlights
The genus Proechimys Allen, 1899 is the most speciose and geographically most widely distributed of the Echimyidae rodents
There have been relatively few studies examining the helminth fauna of this species (Cordeiro et al 2015a). It has been cited as host of seven species of nematodes: four out of them are Heligmonellidae: Acanthostrongylus acanthostrongylus Travassos, 1937, Pudica evandroi (Travassos, 1937), Heligmostrongylus squamastrongylus (Travassos, 1937), and Squamasnema amazonica Cordeiro, Melo, Furtado, Giese, Maldonado Jr. and dos Santos, 2015
With the description of Pudica minima n. sp. the number of species of Pudicinae described from Pr. roberti throughout its distribution increases to five
Summary
The genus Proechimys Allen, 1899 is the most speciose and geographically most widely distributed of the Echimyidae rodents. There have been relatively few studies examining the helminth fauna of this species (Cordeiro et al 2015a). To date, it has been cited as host of seven species of nematodes: four out of them are Heligmonellidae: Acanthostrongylus acanthostrongylus Travassos, 1937, Pudica evandroi (Travassos, 1937), Heligmostrongylus squamastrongylus (Travassos, 1937), and Squamasnema amazonica Cordeiro, Melo, Furtado, Giese, Maldonado Jr. and dos Santos, 2015. More recent studies indicate that Pr. oris should be considered a junior synonym of Pr. roberti (Weksler et al 2001, Patton and Leite 2015)
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