Science and Technology Production
Congress
Authorship
Carmo, Gustavo Macêdo
;
Lacerda, Gloria
;
AILAN CHOKE, LORENA GISELA
;
Felipe B. Pereira
Date
2025
Publishing House and Editing Place
Asociación Argentina de Parasitología
Summary
Information provided by the agent in
SIGEVA
The genus Oswaldofilaria (Nematoda: Onchocercidae) comprises 15 species parasitic in reptiles, in which five have been reported in crocodilians and 10 in lizards. Oswaldofilaria bacillaris, one of the taxa that parasitizes crocodilian reptiles, has incomplete morphological knowledge and no genetic characterization. Therefore, this work aimed to provide the morphological and genetic characterization of O. bacillaris, collected from Caiman yacare in the Miranda River, Pantanal wetlands, State of ...
The genus Oswaldofilaria (Nematoda: Onchocercidae) comprises 15 species parasitic in reptiles, in which five have been reported in crocodilians and 10 in lizards. Oswaldofilaria bacillaris, one of the taxa that parasitizes crocodilian reptiles, has incomplete morphological knowledge and no genetic characterization. Therefore, this work aimed to provide the morphological and genetic characterization of O. bacillaris, collected from Caiman yacare in the Miranda River, Pantanal wetlands, State of Mato Grosso do Sul, Brazil. The phylogenetic relationships among representatives of Onchocercidae were also discussed. Nematodes were examined using light and scanning electron microscopy, and a partial fragment of the 28S rDNA was sequenced. The phylogeny was reconstructed using Bayesian inference. Specimens were identified as O. bacillaris based on an oral opening and buccal capsule dorsally oriented, oesophagus larger than 3.5 mm, and spicular ratio not exceeding 2.8. Minor differences in the number and arrangement of caudal papillae were observedbetween the present material and the previous redescriptions of O. bacillaris. The results of morphological and geneticanalyses supported the validity of O. baciliaris. In the phylogeny, O. bacillaris formed an independent lineage sister toO. chabaudi with full support, and these two were sister to O. petersi, making the genus Oswaldofilaria monophyleticalso with full support. It could be noted that the phylogenetic assemblages shared similarities in the host taxa, in whichthe subfamily Oswaldofilariinae included parasites of reptiles, and Waltonellinae and Icosiellinae that were sister groupsincluded parasites of amphibians. These subfamilies were monophyletic as same as Ochtorenella and Icosiella. This is thefirst genetic characterization of O. bacillaris, and C. yacare is a new host species for this nematode.
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Key Words
INTEGRATIVE TAXONOMYSQUAMATABRAZIL