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A New Species of Sprentascaris (Nematoda: Raphidascarididae) in Hypostomus commersoni (Pisces: Loricariidae) from Argentina

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Abstract

Purpose

To report a new species: Sprentascaris pampayensis, a Raphidascarididae parasite from the Neotropical region.

Methods

During a parasitological survey, specimens were collected of a new species of Sprentascaris from Hypostomus commersoni Valenciennes from urban lakes in Santa Fe City, Santa Fe Province, in the Pampean region of Argentina. Morphological and morphometric descriptions, and molecular analyses were performed.

Results

The new species, S. pampayensis n. sp., is characterized by having slightly extended lateral wings in both sexes, oral structure with three well-developed lips with double papillae, ventrolateral lips with an amphidial pore. Triangular buccal opening with three well-developed lips with flattened extensions at their bases, which end in a pointed manner towards the back. Males have 17 pairs of preanal papillae, 1 pair of adanal papillae, 3 pairs of postanal papillae and 1odd median postanal papilla located between the first and second pairs, unusual shape of caudal papillae with the central tubular part conspicuously elevated. Females have pre-equatorial vulva, smooth-shelled eggs, and mature embryonated eggs.

Discussion

Sprentascaris pampayensis n. sp. differs morphologically and genetically from S. manherti Petter and Cassone, 1984, S. lanfrediae Melo, Santos, Giese, Santos and Santos, 2011 and S. andersoni Malta, Paiva, Elisei, Tavares and Pereira, 2018. Morphological and morphometric comparison also distinguishes it from S. pimelodi Petter and Cassone, 1984, S. hypostomi Petter and Cassone, 1984, S. marano Ramallo, 2009, and S. saltaensis Ailán-Choke, Ramallo and Davies, 2017. Sprentascaris pampayensis n. sp. is a new parasitic nematode of Hypostomus commersoni.

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Acknowledgements

The authors thank Pablo Pereira and Nora Kotowicz for help with digitalizing figures; Hernán Esquivel and the staff of the Laboratory of Scanning Electron Microscopy (CIME), CONICET-Universidad Nacional de Tucumán for technical assistance; colleagues at Universidad Nacional del Litoral for assistance in the field activities; all the members of this project, and the authorities of Club Náutico El Quillá and Jockey Club Santa Fe. They are grateful to the anonymous reviewers for their interesting suggestions, especially regarding the shape of the caudal papillae.

Funding

This research was supported in part by the Universidad Nacional del Litoral, Argentina (CAI + D 50120150100168LI and N° 50520190100087LI01).

Author information

Authors and Affiliations

  1. Instituto de Invertebrados, Fundación Miguel Lillo, Miguel Lillo 251, 4000, San Miguel de Tucumán, Argentina

    Geraldine Ramallo

  2. Departamento de Ciencias Naturales, Facultad de Humanidades y Ciencias, Universidad Nacional del Litoral (FHUC-UNL), Ciudad Universitaria, Paraje El Pozo, 3000, Santa Fe, Argentina

    Silvina Chemes

  3. Laboratorio de Genética, Departamento de Ciencias Naturales (FHUC-UNL), CONICET, Ciudad Universitaria, Paraje El Pozo, 3000, Santa Fe, Argentina

    Patricia Amavet

  4. Departamento de Ciencias Naturales, Facultad de Humanidades y Ciencias, Universidad Nacional del Litoral (FHUC-UNL), Ciudad Universitaria, Paraje El Pozo, 3000, Santa Fe, Argentina

    Liliana Rossi

Authors
  1. Geraldine Ramallo
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  2. Silvina Chemes
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  4. Liliana Rossi
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Contributions

LR, GR, SCH and PA conceived the study and wrote the manuscript. LR performed the laboratory and office work. GR performed the morphological analyses and prepared the images. PA did the molecular analyses and contributed to the manuscript. SCH made the comparative analyses between species and the detailed description of the new species. GR and LR reviewed the manuscript.

Corresponding author

Correspondence to Silvina Chemes.

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Fishes were captured by UNL researchers according to the international, national and/or institutional guidelines. Fish species is not listed in CITES or CMS and listed under Least Concern in IUCN Red List Status.

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Ramallo, G., Chemes, S., Amavet, P. et al. A New Species of Sprentascaris (Nematoda: Raphidascarididae) in Hypostomus commersoni (Pisces: Loricariidae) from Argentina. Acta Parasit. 67, 1634–1643 (2022). https://doi.org/10.1007/s11686-022-00618-1

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