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Peer-reviewedCC BYSystematic parasitology

Dactylogyridae (Monopisthocotyla) parasitizing Caenotropus labyrinthicus (Characiformes: Chilodontidae) from the Tocantins and Gurupi river basins, northern Brazil, with the proposal of Tocantinsiella n. gen. (Dactylogyridae) and four new species.

  • Jéssica França Antunes1
  • Marcia Cristina Nascimento Justo1
  • Yuri Costa de Meneses2
  • Álvaro José Bittencourt de Freitas1
  • Diego Carvalho Viana3
  • Felipe Polivanov Ottoni4
  • Simone Chinicz Cohen1
4 affiliations
  1. 1Laboratório de Helmintos Parasitos de Peixes - LHPP, Instituto Oswaldo Cruz, Fiocruz, Avenida Brasil, 4365, Manguinhos, Rio de Janeiro, RJ, 21040-360, Brazil.
  2. 2Laboratório de Helmintos Parasitos de Peixes - LHPP, Instituto Oswaldo Cruz, Fiocruz, Avenida Brasil, 4365, Manguinhos, Rio de Janeiro, RJ, 21040-360, Brazil. [email protected].
  3. 3Núcleo de Estudos Morfofisiológicos Avançados - NEMO, Universidade Estadual da Região Tocantina do Maranhão, Campus Imperatriz, Rua Godofredo Viana, 1300, Imperatriz, MA, 65901-480, Brazil.
  4. 4Laboratório de Sistemática e Ecologia de Organismos Aquáticos, Universidade Federal do Maranhão (UFMA), Campus de Chapadinha, BR-222, KM 04, S/N, Chapadinha, MA, Brazil.
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Abstract

Four new species, assigned to the proposed new genus Tocantinsiella n. gen., were described from the gills of Caenotropus labyrinthicus collected in the Tocantins and Gurupi river basins, northern Brazil: Tocantinsiella maranhensis n. sp., Tocantinsiella brassicae n. sp., Tocantinsiella vesiculosa n. sp., and Tocantinsiella flabellata n. sp. The new species are characterized mainly by the presence of a sclerotized, robust, and sinistral vaginal vestibule, as well as a copulatory ligament connecting the male copulatory organ (MCO) from the accessory piece, which represent morphological and diagnostic characteristics for the proposed new genus. Tocantinsiella n. gen. is morphologically similar to Heterothecium due to the presence of a sclerotized, sinistral vaginal vestibule, differing due to the presence of a copulatory ligament and a non-articulated MCO. Philocorydoras also shares similarities related to the morphology of the copulatory complex. However, species of this genus are recorded only in Siluriformes fishes. This study provides a significant expansion of the diversity of helminth fauna in fishes of the family Chilodontidae by describing a new genus and four new species of Monopisthocotyla in the host studied.

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Cite

BibTeXRIS
BibTeX
@article{antunes2026dactylogyridae,
  title = {{Dactylogyridae (Monopisthocotyla) parasitizing Caenotropus labyrinthicus (Characiformes: Chilodontidae) from the Tocantins and Gurupi river basins, northern Brazil, with the proposal of Tocantinsiella n. gen. (Dactylogyridae) and four new species.}},
  author = {Jéssica França Antunes and Marcia Cristina Nascimento Justo and Yuri Costa de Meneses and Álvaro José Bittencourt de Freitas and Diego Carvalho Viana and Felipe Polivanov Ottoni and Simone Chinicz Cohen},
  journal = {Systematic parasitology},
  year = {2026},
  month = oct,
  doi = {10.1007/s11230-026-10303-w},
  url = {https://europepmc.org/article/MED/42957831},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Dactylogyridae (Monopisthocotyla) parasitizing Caenotropus labyrinthicus (Characiformes: Chilodontidae) from the Tocantins and Gurupi river basins, northern Brazil, with the proposal of Tocantinsiella n. gen. (Dactylogyridae) and four new species.
AU  - Jéssica França Antunes
AU  - Marcia Cristina Nascimento Justo
AU  - Yuri Costa de Meneses
AU  - Álvaro José Bittencourt de Freitas
AU  - Diego Carvalho Viana
AU  - Felipe Polivanov Ottoni
AU  - Simone Chinicz Cohen
PY  - 2026
DA  - 2026/10/30
JO  - Systematic parasitology
DO  - 10.1007/s11230-026-10303-w
UR  - https://europepmc.org/article/MED/42957831
AB  - Four new species, assigned to the proposed new genus Tocantinsiella n. gen., were described from the gills of Caenotropus labyrinthicus collected in the Tocantins and Gurupi river basins, northern Brazil: Tocantinsiella maranhensis n. sp., Tocantinsiella brassicae n. sp., Tocantinsiella vesiculosa n. sp., and Tocantinsiella flabellata n. sp. The new species are characterized mainly by the presence of a sclerotized, robust, and sinistral vaginal vestibule, as well as a copulatory ligament connecting the male copulatory organ (MCO) from the accessory piece, which represent morphological and diagnostic characteristics for the proposed new genus. Tocantinsiella n. gen. is morphologically similar to Heterothecium due to the presence of a sclerotized, sinistral vaginal vestibule, differing due to the presence of a copulatory ligament and a non-articulated MCO. Philocorydoras also shares similarities related to the morphology of the copulatory complex. However, species of this genus are recorded only in Siluriformes fishes. This study provides a significant expansion of the diversity of helminth fauna in fishes of the family Chilodontidae by describing a new genus and four new species of Monopisthocotyla in the host studied.
SN  - 0165-5752
SN  - 1573-5192
ER  -