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Description of Saccocoelioides miguelmontesi n. sp. (Digenea: Haploporidae) from characid fishes in the Iguazu River Basin based on morphological and molecular evidence

Published online by Cambridge University Press:  13 March 2024

M.M. Montes Open the ORCID record for M.M. Montes [Opens in a new window] ,
Y. Croci ,
J. Barneche ,
W. Ferrari ,
G. Reig Cardarella  and
S. Martorelli
M.M. Montes*
Affiliation:
Centro de Estudios Parasitológicos y Vectores (CEPAVE), Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de La Plata (CCT, CONICET-UNLP), La Plata, Buenos Aires, Argentina
Y. Croci
Affiliation:
Centro de Estudios Parasitológicos y Vectores (CEPAVE), Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de La Plata (CCT, CONICET-UNLP), La Plata, Buenos Aires, Argentina
J. Barneche
Affiliation:
Centro de Estudios Parasitológicos y Vectores (CEPAVE), Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de La Plata (CCT, CONICET-UNLP), La Plata, Buenos Aires, Argentina
W. Ferrari
Affiliation:
Instituto de Biotecnología Ambiental y Salud (INBIAS), Consejo Nacional de Investigaciones Científicas, Universidad Nacional de Rio Cuarto (CONICET-UNRC), Rio cuarto, Córdoba
G. Reig Cardarella
Affiliation:
Escuela de Tecnología Médica y Centro Integrativo de Biología y Química Aplicada (CIBQA), Universidad Bernardo O’ Higgins, Santiago de Chile, Chile
S. Martorelli
Affiliation:
Centro de Estudios Parasitológicos y Vectores (CEPAVE), Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de La Plata (CCT, CONICET-UNLP), La Plata, Buenos Aires, Argentina
*
Corresponding author: M.M. Montes; Email: martinmiguelmontes@gmail.com
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Abstract

Here we describe a new species of the genus Saccocoelioides found parasitizing Astyanax dissimilis Garavello & Sampaio, Psalidodon bifasciatus (Garavello and Sampaio) and Bryconamericus ikaa Casciotta, Almirón & Azpelicueta from the Iguazu National Park, Misiones province, Argentina. Saccocoelioides miguelmontesi n. sp. was studied based on morphological and molecular (28S rDNA and COI mtDNA sequences) data. The COI mtDNA tree indicated that the specimens collected from the three fish hosts are conspecific, with an intragroup p-distance of 0%. The new species shows an intermediate morphological configuration between the diminutive and robust forms described for Saccocoelioides by Curran (2018). Although, in the 28S rDNA tree, it is placed in a well-supported clade with the two robust species analysed (S. elongatus and S. magnus; p-distance of 1 and 2%, respectively), it differs from the robust group by the range of body size, mature egg size, oral and ventral sucker size, sucker ratio, oral sucker to pharynx ratio, and post-cecal or post-testis/body length percentage. Our results led us to redefine the robust group as having eggs shorter or equal in length to the pharynx. Saccocoelioides miguelmontesi n. sp. the 10th species reported from Argentina and the 7th species within the robust group.

Keywords

DigeneanIguazuPsalidodonCOI28SBryconamericus
Type
Research Paper
Information
Journal of Helminthology , Volume 98 , 2024 , e24
Copyright
© The Author(s), 2024. Published by Cambridge University Press

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