Abstract
Serpentirhabdias atracti n. sp. is described based on specimens discovered in the lung of Atractus major Boulenger from Caxiuanã National Forest, Pará, Brazil. The new species is assigned to Serpentirhabdias Tkach, Kuzmin & Snyder, 2014 based on morphological characters (comparatively thin body cuticle without prominent inflations, arrangement of circumoral papillae in two lateral groups, pre-equatorial position of vulva, eggs in uteri at early cleavage stages), as well as because of its parasitism in snakes. The new species is most similar to S. vellardi (Pereira, 1928) due to the absence of lips and buccal capsule, similar body dimensions, and the specificity to dipsadid snakes in Brazil. The two species differ in the shape of the tail (bulbous dilatation in the posterior part followed by a thread-like tail tip present in S. atracti n. sp.), the width of the oesophagus, and the size of the excretory glands. Serpentirhabdias atracti n. sp. is the sixth species of this genus found in the Neotropical Region.
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Notes
In the original description of S. vellardi the length of the excretory glands is given as "from 0.035 to 0.040 mm" (p. 13 in Pereira, 1928); apparently, the decimal point was placed erroneously since the excretory glands shown in their figure 2 (p. 19) are longer than the oesophagus described as measuring "from 0.26 to 0.27 mm" (p. 13; Pereira, 1928).
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Acknowledgements
We are grateful to Gleomar Maschio, Yuri Willkens de Oliveira Costa, Laís de Nazaré Barros Barbosa, Kleiton Rodolfo Alves Silva, Lílian Cristina Macedo and Luciana de Cássia Silva do Nascimento from the Federal University of Pará for their valuable assistance during the field expedition. We are also thankful to Ana Prudente from the Museu Paraense Emílio Goeldi for identifying the host. Financial support for this study was provided by the PROPESP/PPG-BAIP/UFPA, CAPES Foundation, the Ministry of Education of Brazil (grant CAPES–PARASITOLOGIA BÁSICA/2010), and the National Council for Scientific and Technological Development (CNPq) (grants SISBiota 2010-Sistema Nacional de Pesquisa em Biodiversidade, PVE CAPES/CNPq A_033/2013).
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Kuzmin, Y., de Vasconcelos Melo, F.T. & dos Santos, J.N. A new species of Serpentirhabdias Tkach, Kuzmin & Snyder, 2014 (Nematoda: Rhabdiasidae) parasitic in the brown ground snake Atractus major Boulenger (Reptilia: Serpentes: Dipsadidae) in Brazil. Syst Parasitol 89, 101–106 (2014). https://doi.org/10.1007/s11230-014-9520-5
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DOI: https://doi.org/10.1007/s11230-014-9520-5