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Description of a new species of Auriculostoma (Digenea: Allocreadiidae) from Characidium heirmostigmata (Characiformes: Crenuchidae) from Argentina, using morphological and molecular data

Published online by Cambridge University Press:  05 April 2021

M.M. Montes Open the ORCID record for M.M. Montes [Opens in a new window] ,
J. Barneche ,
Y. Croci ,
D. Balcazar ,
A. Almirón ,
S. Martorelli  and
G. Pérez-Ponce de León
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), Boulevard 120s/n e/60 y 64, La Plata, 1900, 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), Boulevard 120s/n e/60 y 64, La Plata, 1900, 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), Boulevard 120s/n e/60 y 64, La Plata, 1900, Argentina
D. Balcazar
Affiliation:
Centro de Estudios Parasitológicos y Vectores (CEPAVE), Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de La Plata (CCT, CONICET-UNLP), Boulevard 120s/n e/60 y 64, La Plata, 1900, Argentina
A. Almirón
Affiliation:
División Zoología Vertebrados, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900, La Plata, Buenos Aires, Argentina
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), Boulevard 120s/n e/60 y 64, La Plata, 1900, Argentina
G. Pérez-Ponce de León
Affiliation:
Escuela Nacional de Estudios Superiores Unidad Mérida (ENES-Mérida), Universidad Nacional Autónoma de México, Km. 4.5 carretera Mérida-Tétiz, Municipio de Ucú, C.P. 97357, Yucatán, Mexico
*
Author for correspondence: M.M. Montes, E-mail: martinmiguelmontes@gmail.com
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Abstract

During a parasitological survey of fishes at Iguazu National Park, Argentina, specimens belonging to the allocreadiid genus Auriculostoma were collected from the intestine of Characidium heirmostigmata. The erection of the new species is based on a unique combination of morphological traits as well as on phylogenetic analysis. Auriculostoma guacurarii n. sp. resembles four congeneric species – Auriculostoma diagonale, Auriculostoma platense, Auriculostoma tica and Auriculostoma totonacapanensis – in having smooth and oblique testes, but can be distinguished by a combination of several morphological features, hosts association and geographic distribution. Morphologically, the new species can be distinguished from both A. diagonale and A. platense by the egg size (bigger in the first and smaller in the last); from A. tica by a shorter body length, the genital pore position and the extension of the caeca; and from A. totonacapanensis by the size of the oral and ventral sucker and the post-testicular space. Additionally, one specimen of Auriculostoma cf. stenopteri from the characid Charax stenopterus (Characiformes) from La Plata River, Argentina, was sampled and the partial 28S rRNA gene was sequenced. The phylogenetic analysis revealed that A. guacurarii n. sp. clustered with A. tica and these two as sister taxa to A. cf. stenopteri. The new species described herein is the tenth species in the genus and the first one parasitizing a member of the family Crenuchidae.

Keywords

AuriculostomaAllocreadiidaeIguazúArgentinaCrenuchidaeCharacidium heirmostigmata
Type
Research Paper
Information
Journal of Helminthology , Volume 95 , 2021 , e19
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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