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Neocosmocercella fisherae n. sp. (Nematoda: Cosmocercidae), a parasite of the large intestine of Phyllomedusa bicolor (Boddaert) (Anura: Phyllomedusidae) from the Brazilian Amazon


Neocosmocercella fisherae n. sp. is the first nematode species found parasitising Phyllomedusa bicolor from the Brazilian Amazon Region. The new species has a triangular oral opening, with bi-lobed lips, and is distinguished from N. bakeri (triangular oral opening with simple lips), and from N. paraguayensis (hexagonal oral opening with bi-lobed lips). Additionally, the new species has ciliated cephalic papillae, which are absent in the other species of the genus. The reduced uterine sac and the presence of a single egg in the uterus in females are the main morphological characters that differentiate the new species from its congeners N. bakeri (8–10 eggs) and N. paraguayensis (10 eggs, based on the allotype). Additionally, the new species differs from the other two species of the genus by morphometric characters such as the size of spicules and gubernaculum in males and the vagina in females. Until now, phyllomedusid anurans are the only known hosts for the nematodes of this genus. The present work describes the third species of the genus and the first species of nematode parasitising P. bicolor.

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We are grateful to Lilian Cristina Macedo for collecting the hosts and parasites; we appreciate the help of Yuri Wilkens and Adriano Penha Furtado on the schematic drawing, too. We are also thankful to Dr Elane Giese for granting access to the Laboratory of Animal Embryology and Histology of the Federal Rural University of Amazonia and for scanning electron microscopy analyses and to Dr Cristina Salgado and Lic. Cecilia Galíndez, from “Servicio de Microscopía Electrónica de Barrido”, Universidad Nacional del Nordeste, Corrientes, Argentina for assistance in scanning electron microscopy analyses. We would like to thank Keya Weekes for English revision. This study is part of the master’s dissertation of Ana Nunes dos Santos from the Post-Graduation Program in Biology of Infectious and Parasitic Agents /ICB-UFPA.


The financial support for this study was provided by “Parasitologia Básica 2010” (CAPES); Productivity Scholarship (CNPQ) to JNS.

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Correspondence to Francisco Tiago de Vasconcelos Melo.

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The authors declare that they have no conflict of interest.

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All applicable institutional, national and international guidelines for the care and use of animals were followed. Host specimens were collected under permits 0004/06 NUC SUPES PA, project “Biodiversity survey of the herpetofauna according to the Research Program on PPBIO eastern Amazonia” and SISBIO 32660-1, project “Amphibian and reptile diversity and associated helminth parasites in the Amazon region”.

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This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as CAA0C09E-9F1C-455E-86B9-158059F9871F. This article was published as an Online First article on the online publication date shown on this page. The article should be cited by using the doi number. This is the Version of Record.

This article is part of the Topical Collection Nematoda.

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dos Santos, A.N., de Oliveira Rodrigues, A.R., dos Santos Rocha, F.J. et al. Neocosmocercella fisherae n. sp. (Nematoda: Cosmocercidae), a parasite of the large intestine of Phyllomedusa bicolor (Boddaert) (Anura: Phyllomedusidae) from the Brazilian Amazon. Syst Parasitol 95, 293–300 (2018). https://doi.org/10.1007/s11230-017-9770-0

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