Morphological and phylogenetic characterisation of Unicauda tavaresii n. sp. (Myxosporea: Myxobolidae): a parasite of th
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FISH PARASITOLOGY - ORIGINAL PAPER
Morphological and phylogenetic characterisation of Unicauda tavaresii n. sp. (Myxosporea: Myxobolidae): a parasite of the circumorbital tissue of the eye of two characiform fishes from the Amazon region of Brazil Marcelo Francisco da Silva 1,2 & Thales Geovane Rodrigues Maciel 2 & Diehgo Tuloza da Silva 1 & Sávio Lucas de Matos Guerreiro 3 & Edilson Rodrigues Matos 4 & Igor Guerreiro Hamoy 5 Received: 19 December 2019 / Accepted: 24 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Myxozoans of the family Myxobolidae are common parasites in fish. The diversity and ecology of the species of the genus Unicauda are poorly known, which hampers the understanding of the distribution and prevalence of this group of parasites. In the present study, cysts containing parasites whose morphology was consistent with the genus Unicauda were found in the circumorbital region of the ocular conjunctiva of the freshwater fish Moenkhausia grandisquamis Müller & Troschel, 1845 (Characiformes: Characidae) and Triportheus angulatus Spix & Agassiz, 1829 (Characiformes: Triportheidae). The spores have an oval body and long caudal appendage, with a mean total length of 65.2 ± 5.9 μm and width of 5.2 ± 0.7 μm, with two oval and symmetrical polar capsules of 4.9 ± 0.5 μm in length and 1.4 ± 0.2 μm in width, containing polar filaments with five or six coils. An integrated comparative analysis of the morphological characteristics of this parasite and partial sequences of the SSU rDNA gene supported the identification of a new species of histozoic parasite of the genus Unicauda found in fish from the Tocantins River basin, in the eastern Brazilian Amazon region. The new species was denominated by Unicauda tavaresii n. sp. Keywords SSU rDNA . Fish parasite . Myxozoa . Tropical region . Brazilian Amazon
Introduction Section Editor: Astrid Holze Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00436-020-06866-2) contains supplementary material, which is available to authorized users. * Edilson Rodrigues Matos [email protected] 1
Postgraduate Program in Biology of Infectious and Parasitic Agents, Federal University of Pará - PPgBAIP/UFPA, Belém, Pará, Brazil
2
State University of the Tocantina Region of Maranhão - UEMASUL, Imperatriz, Maranhão, Brazil
3
Postgraduate Programme in Genetics, Federal University of Pará PPgGEN/UFPA, Belém, Pará, Brazil
4
Carlos Azevedo Research Laboratory, Federal Rural University of the Amazon (UFRA), Avenida Presidente Tancredo Neves, 2501, Montese, Belém, Pará 66077-901, Brazil
5
Laboratory of Applied Genetics, Federal Rural University of Amazonia - LGA/UFRA, Belém, Pará, Brazil
The known diversity of a number of histozoic and coelozoic parasites that infect fish, belonging to the class Myxosporea Bütschli, 1881, has recently been amplified considerably through the systematic integration of morphological and phylogenetic analyses (Kent et al. 2001; Lom and Dyková 2006). These studies ha
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