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Licensed Unlicensed Requires Authentication Published by De Gruyter October 15, 2017

Redescription of the nematode parasites of lizards: Strongyluris oscariTravassos, 1923 (Heterakidae) from Brazil and Pharyngodon mamillatus (Linstow, 1897) (Pharyngodonidae) from Egypt

Felipe B. Pereira, José L. Luque and Luiz E. R. Tavares
From the journal Acta Parasitologica


Strongyluris oscariTravassos, 1923, parasite of Topidurus torquatus (Wied-Neuwied, 1820) (Tropiduridae) from Brazil and Pharyngodon mamillatus (Linstow, 1897) of Chalcides ocellatus (Forskal, 1775) (Scincidae) from Egypt, were redescribed based on light and scanning electron microscopy, and re-evaluation of specimens from parasitological collections. The following features were accurately observed in S. oscari for the first time: structure of lips and pharyngeal valve, presence and distribution of somatic papillae, number and arrangement of caudal papillae, presence of inner sclerotised structures supporting the ventral sucker and the ventral region in tail of males, and structure of the posterior anal lip in females. The unpaired papilla on the inferior edge of the ventral sucker in males of S. oscari is a cuticular groove instead of a true papilla. Regarding the morphology of P. mamillatus the following features were given in details for the first time: structure of the cephalic end in both male and female, location of amphids, position of phasmids in females and the accurate morphology of caudal bursa in males, including the distribution of caudal papillae and the genital cone morphology. Strongyluris oscari and P. mamillatus have no intraspecific morphological variations, but wide range on biometric features. These variations may be accounted by host/environment attributes, since they exhibit wide host and geographical spectra. The present results increased the morphological knowledge of P. mamillatus and S. oscari, strengthening their taxonomic validity.


Authors are thankful to Dr. Tomáš Scholz and the staff of the Laboratory of Electron Microscopy from the Institute of Parasitology, Biology Centre of the Czech Academy of Sciences (IPCAS) (IPCAS; RVO: 60077322), and the Czech Science Foundation (project No. P505/12/G112), for support and covering costs of SEM observations at the IPCAS. Thanks are also due to Dr. František Moravec and Blanka Škořiková from the IPCAS for loan of specimens of P. mamillatus; Dr. Marcelo Knoff and Dr. Daniela A. Lopes from the Coleção Helmintológica do Instituto Oswaldo Cruz (CHIOC) for loan of speciemens of Strongyluris spp.; Dr. Bernadete M. Sousa from the Universidade Federal de Juiz de Fora for yielding the specimens S. oscari. Felipe B. Pereira was supported by a Post-doctoral fellowship PNPD-CAPES (Programa Nacional de Pós-Doutorado-Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-CAPES, Brazil), José L. Luque (Nos. 474077/2011-0, 304254/2011-8, 402665/2012-0) and Luiz E. R. Tavares (No 311567/2013-4) were supported by a Research fellowship from CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico do Brasil).


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Received: 2017-6-14
Revised: 2017-8-10
Accepted: 2017-8-21
Published Online: 2017-10-15
Published in Print: 2017-12-20

© 2017 W. Stefański Institute of Parasitology, PAS

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