New species of Urocleidoides (Monogenoidea: Dactylogyridae) from the gills of two species of Anostomidae from the Brazilian Amazon

During the study of ectoparasites (Platyhelminthes) of fish in the floodplain of the Upper Paraná River - Brazil, a new species of Urocleidoides, present in the gill filaments of Hemiodus orthonops (Hemiodontidae), is described using morphological description and molecular data from the mitochondrial region of cytochrome c oxidase, subunit 1 (COI) and the partial region of the 28S rDNA gene. Urocleidoides luquei n. sp. differs from all its congeners by the presence of a filament that joins the accessory piece to the base of the male copulatory organ and resembles U. paradoxus and U. surianoae. Phylogenetic analyses using molecular data revealed that U. luquei n. sp. forms a paraphyletic group concerning the other Urocleidoides species. In this way, as well as contributing to the description of a new species, we seek to encourage and contribute to the increase in research using integrative taxonomy, thus making it possible to elucidate some unresolved questions about the genus Urocleidoides.

Section: Introductionmentioning

confidence: 99%

“…Fifty-two species of Urocleidoides are considered valid to date and occur especially in Neotropical Characiform fishes (Ferreira et al 2018; Oliveira et al . 2020; Zago et al . 2020; De Oliveira et al .…”

Section: Introductionmentioning

confidence: 99%

A new species of Urocleidoides Mizelle & Price 1964 (Monogenea: Dactylogyridae) parasite of Hemiodus orthonops Eigenmann & Kennedy, 1903 (Hemiodontidae) from the upper Paraná River floodplain

Hasuike,

Scorsim,

Arjona

et al. 2024

“…Urocleidoides Mizelle & Price, 1964 is one of the most species-rich among the Neotropical dactylogyrid genera, comprising 52 valid species (Kritsky et al 1986;Zago et al 2020;Santos-Neto and Domingues 2023), and currently includes species parasitising the gills and nasal cavities of fishes of the orders Characiformes, Gymnotiformes, Cyprinodontiformes, and Siluriformes (although this last one still requires revision) (Ferreira et al 2018;Oliveira et al 2020;Zago et al 2020;Freitas et al 2021;Oliveira et al 2021;Santos Neto and Domingues 2023). The genus was proposed by Mizelle and Price (1964) to accommodate Urocleidoides reticulatus Mizelle & Price, 1964 (type-species) from Poecilia reticulata (=Lebistes reticulatus) Peters, 1859 (Cyprinodontiformes, Poeciliidae) from an aquarium in Sacramento California, USA (probably collected from the Amazon river basin), which was characterised by the presence of a sinistral vagina and copulatory complex comprising an accessory piece and a non-articulated male copulatory organ.…”

Section: Introductionmentioning

confidence: 99%

A new species of Urocleidoides Mizelle & Price, 1964 from the gills of Schizodon nasutus Kner, 1858 (Characiformes, Anostomidae) in southeastern Brazil

Ebert,

Osaki-Pereira,

Pérez-Ponce de León

et al. 2024

Based on an integrative approach, this study describes a new species of Urocleidoides infesting Schizodon nasutus in the Paranapanema River basin, Brazil. The new species can be distinguished from its congeners by specific morphological features, including the shape of the male copulatory organ and accessory piece, the ventral bar shape, and the shape and size of the hooks. Molecular analyses, particularly of the 28S rDNA gene, suggest a close relationship between the new species and Urocleidoides paradoxus. The phylogenetic and taxonomic arrangement of Urocleidoides is discussed, as the analyses of the 28S rDNA and COI mtDNA resolved the genus as non-monophyletic, with Diaphorocleidus, Rhinoxenus, and Cacatuocotyle nested within it. Additional morphological and molecular data of other congeneric species are required to investigate the phylogenetic position and classification of Urocleidoides. This study underscores the significance of using integrative approaches in understanding host–parasite associations and phylogenetic relationships, contributing to the description of the freshwater fish parasite biodiversity in South America, particularly in the Paranapanema river basin.

“…Among the Neotropical dactylogyrids, members of Urocleidoides Mizelle & Price, 1964 stand out for their wide distribution in host groups, with species parasitizing the gills and nasal cavities of fishes of the orders Characiformes, Gymnotiformes, Cyprinodontiformes, and Siluriformes (Oliveira et al 2020; Zago et al 2020; Freitas et al 2021; Oliveira et al 2021). The genus Urocleidoides was proposed by Mizelle & Price (1964) to accommodate U. reticulatus Mizelle & Price, 1964, collected from the gills of Poecilia reticulata Peters (Cyprinodontiformes, Poeciliidae) of the Capital Aquarium, Sacramento, California, USA.…”

Section: Introductionmentioning

confidence: 99%

Integrative taxonomy ofUrocleidoidesspp. (Monogenoidea: Dactylogyridae) parasites of characiform and gymnotiform fishes from the coastal drainages of the Eastern Amazon, Brazil

Neto

Domingues

2023

Eight species (four new) of Urocleidoides are reported from Characiformes and Gymnotiformes fishes of the coastal drainages of the Eastern Amazon. Urocleidoides vanini n. sp. is characterized by having a male copulatory organ (MCO) with three and a half counterclockwise rings, absence of vaginal sclerite, and a V-shaped ventral bar. Urocleidoides atilaiamarinoi n. sp. has MCO with two and a half counterclockwise rings, dumbbell-shaped accessory piece, similar anchors, open V-shaped ventral bar, and open U-shaped dorsal bar. Urocleidoides macrosoma n. sp. exhibits an elongate and robust body, MCO comprising one counterclockwise ring, similar anchors with wavy point, and dumbbell-shaped ventral and dorsal bars. Urocleidoides nataliapasternakae n. sp. has MCO comprising two and a half counterclockwise rings, vaginal canal convoluted, point of the dorsal anchor with ornamentation as sclerotized shredded filaments, elongate dumbbell-shaped ventral bar, and U-shaped dorsal bar. Urocleidoides naris and Urocleidoides brasiliensis from H. malabaricus (Characiformes) and the incertae sedis species, Urocleidoides gymnotus and Urocleidoides carapus, from Sternopygus macrurus (Gymnotiformes) are reported, and their molecular sequences are presented in this study. Phylogenetic analyses based on molecular data (28S rDNA and COI mtDNA) reveal that species of Urocleidoides lacking vaginal sclerite are closely related to species that possess vaginal sclerite, suggesting that the absence of vaginal sclerite in Urocleidoides may be the result of a secondary loss. The relationships between species of Urocleidoides and other Neotropical dactylogyrids are also addressed.