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Monticellia santafesina n. sp. (Cestoda: Proteocephalidea), a parasite of Megalonema platanum (Günther) (Siluriformes: Pimelodidae) in the Paraná River basin, Argentina

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Abstract

The proteocephalidean tapeworm Monticellia santafesina n. sp. is described from the siluriform catfish Megalonema platanum (Günther) (Siluriformes: Pimelodidae) in the Paraná River basin, Argentina. The new species is allocated to Monticellia La Rue, 1911 (Proteocephalidae: Monticelliinae) because of the cortical position of the testes, ovary, vitelline follicles and uterus, a globular scolex without a metascolex and uniloculate suckers. The new species differs from all other species of Monticellia (except for M. lenha Woodland, 1933) in possessing a vaginal canal opening anterior or posterior to the cirrus-sac. M. santafesina can be distinguished from M. lenha by the following characteristics: a larger body size; a weakly developed internal longitudinal musculature arranged in 15–35 slim bundles of muscle fibres; vitelline follicles not interrupted at the level of the cirrus-sac and vaginal canal, and with a few paramuscular and/or medullary follicles; the absence of large spinitriches on the anterior margin of the suckers; and the utilisation of Megalonema platanum (in the Paraná River basin) as its host, rather than Sorubimichthys planiceps (Spix & Agassiz) (in the River Amazon). Monticellia santafesina exhibits low values of prevalence (9%) and intensity of infection (1). Megalonema platanum was parasitised by two proteocephalidean cestodes, Rudolphiella cf. lobosa (Riggenbach, 1895) and the new species described in this paper.

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Acknowledgements

Thanks are due to the ichthyologists Drs Jorge Casciotta and Adriana Almirón for the identification of fish hosts. Special thanks are also due to the two anonymous referees for their valuable comments that helped to improve this manuscript. The study was supported by CONICET (Grant PIP No. 5974), ANPCyT (Proj. BID 1728 OC-AR PICT No. 825) and the Universidad de Buenos Aires (Grants UBACyT-X443 and X453).

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  1. Laboratorio de Helmintología, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Int. Güiraldes 2160, Pabellón II, 4º Piso, Universidad de Buenos Aires, C1428EGA, Buenos Aires, Argentina

    Nathalia J. Arredondo & Alicia A. Gil de Pertierra

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  1. Nathalia J. Arredondo
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  2. Alicia A. Gil de Pertierra
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Correspondence to Nathalia J. Arredondo.

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Arredondo, N.J., Gil de Pertierra, A.A. Monticellia santafesina n. sp. (Cestoda: Proteocephalidea), a parasite of Megalonema platanum (Günther) (Siluriformes: Pimelodidae) in the Paraná River basin, Argentina. Syst Parasitol 76, 103–110 (2010). https://doi.org/10.1007/s11230-010-9238-y

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