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A new species of Metadelphis Travassos, 1944 (Digenea: Dicrocoeliidae) from the gall-bladder of Molossus molossus (Pallas) (Chiroptera: Molossidae) in the Brazilian eastern Amazon


Metadelphis tkachi n. sp. is described based on material from the gall-bladder of Molossus molossus (Pallas) (Chiroptera: Molossidae) in the Brazilian eastern Amazon. The main differentiating characters of the new species include lobed, tandem testes and elongated clusters of vitelline follicles commencing at the level of the seminal receptacle. The new species can be distinguished from Metadelphis lenti (Santos & Gibson, 1998) and Metadelphis apharyngotrema (Marshall & Miller, 1979) by the shape and position of the testes; from Metadelphis evandroi Travassos, 1944 by having tandem, lobed testes and shorter clusters of vitelline follicles; from Metadelphis compactus Travassos, 1955 by having tandem testes and more elongated clusters of vitelline follicles, and from Metadelphis alverangai Travassos, 1955 by having smaller testes and body, and vitellarium with large follicles. New morphological data are reported for M. lenti based on light and scanning electron microscopy; intraspecific variation was observed.

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We thank the Brazilian Federal Agency for the Support and Evaluation of Graduate Education (CAPES) for the scholarship granted to TFF and the Brazilian National Council for Scientific and Technological Development (CNPQ) for the productivity grant awarded to JNS. We are also grateful to Dr Elane Giese for allowing access to the Laboratory of Animal Embryology and Histology of Universidade Rural da Amazônia (Federal Rural University of Amazonia), Belém, Brazil, and for the technical support for the SEM analyses. We thank Thayse Cristine Melo Benathar for help in identifying the bats and Yuri Willkens Oliveira Costa, Hernando Andres Muñoz Carrillo, David Marçal Fernandez Conga and Emanuelle Gabriela Gualberto de Argolo, for assistance with the bat sampling and necropsies. This study is part of the PhD thesis of TFF as part of the Postgraduate Programme in the Biology of Infectious and Parasitic Agents (ICB-UFPA).


This study was supported by the CAPES Foundation, the Ministry of Education of Brazil (grant CAPES-PARASITOLOGIA BASICA/2010) and the National Council for Scientific and Technological Development (CNPq) (CNPq Research grant productivity to JNS and FTVM). PROPESP-UFPA supported the costs for preparation of this manuscript.

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Correspondence to Jeannie Nascimento dos Santos.

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The authors declare that they have no conflicts of interest.

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All applicable institutional, national and international guidelines for the care and use of animals were followed. The sedation and necropsy procedures of the hosts followed vertebrate care protocols authorised by the Chico Mendes Institute for Biodiversity Conservation (ICMBio) under the licenses SISBIO No. 56638-1 and No. 9178-1 and by the Animal Research Ethics Committee, Universidade Federal do Pará, under license Nº 6319260717 CEUA/UFPA.

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Fernandes, T.F., dos Santos, A.N., Furtado, A.P. et al. A new species of Metadelphis Travassos, 1944 (Digenea: Dicrocoeliidae) from the gall-bladder of Molossus molossus (Pallas) (Chiroptera: Molossidae) in the Brazilian eastern Amazon. Syst Parasitol 96, 617–624 (2019). https://doi.org/10.1007/s11230-019-09869-5

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