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Peer-reviewedCC BY 4.0Parasitology

Morphological and molecular description of Serpinema yehi n. sp. (Nematoda: Camallanidae), parasite of Rhinoclemmys punctularia (Testudines: Geoemydidae) from Brazilian Amazon

  • Leandro Mauricio Oliveira Silva1
  • Lorena Freitas Souza Tavares-Costa2
  • Ronald Ferreira Jesus1
  • Marlon Leal1
  • Jeannie Nascimento Santos1
  • Francisco Tiago Vasconcelos Melo1
  1. 1Institute of Biological Sciences, Federal University of Pará (UFPA), Belém, Brazil
  2. 2Vale Institute of Technology Sustainable Development, Belém, Brazil
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Abstract

Serpinema currently comprises 12 valid species of nematode parasites of freshwater turtles, distributed across the Neotropical, Oriental and Palearctic regions. Thus, we describe Serpinema yehi n. sp., a parasite of Rhinoclemmys punctularia from the Brazilian Amazon. Species identification was based on light and scanning electron microscopy, and molecular and phylogenetic analyses were performed using partial sequences of the mitochondrial cytochrome c oxidase subunit I and nuclear 18S genes. Serpinema yehi n. sp. can be distinguished from its congeners by the number of ridges in the buccal capsule, the number and arrangement of caudal papillae, the length and morphology of the right spicule, vulvar lip morphology and the number of mucrons on the female tail. Phylogenetic analyses recovered the new species as closely related to Camallanus, but not nested within the Camallanus spp. clade, thereby supporting the recognition of Serpinema as a valid genus. Serpinema yehi n. sp. represents the second species of the genus described from R. punctularia and the eighth species recorded from Brazil.

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Cite

BibTeXRIS
BibTeX
@article{silva2026morphological,
  title = {{Morphological and molecular description of Serpinema yehi n. sp. (Nematoda: Camallanidae), parasite of Rhinoclemmys punctularia (Testudines: Geoemydidae) from Brazilian Amazon}},
  author = {Leandro Mauricio Oliveira Silva and Lorena Freitas Souza Tavares-Costa and Ronald Ferreira Jesus and Marlon Leal and Jeannie Nascimento Santos and Francisco Tiago Vasconcelos Melo},
  journal = {Parasitology},
  year = {2026},
  month = jul,
  doi = {10.1017/s0031182026102509},
  url = {https://doi.org/10.1017/s0031182026102509},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Morphological and molecular description of Serpinema yehi n. sp. (Nematoda: Camallanidae), parasite of Rhinoclemmys punctularia (Testudines: Geoemydidae) from Brazilian Amazon
AU  - Leandro Mauricio Oliveira Silva
AU  - Lorena Freitas Souza Tavares-Costa
AU  - Ronald Ferreira Jesus
AU  - Marlon Leal
AU  - Jeannie Nascimento Santos
AU  - Francisco Tiago Vasconcelos Melo
PY  - 2026
DA  - 2026/07/20
JO  - Parasitology
DO  - 10.1017/s0031182026102509
UR  - https://doi.org/10.1017/s0031182026102509
AB  - Serpinema currently comprises 12 valid species of nematode parasites of freshwater turtles, distributed across the Neotropical, Oriental and Palearctic regions. Thus, we describe Serpinema yehi n. sp., a parasite of Rhinoclemmys punctularia from the Brazilian Amazon. Species identification was based on light and scanning electron microscopy, and molecular and phylogenetic analyses were performed using partial sequences of the mitochondrial cytochrome c oxidase subunit I and nuclear 18S genes. Serpinema yehi n. sp. can be distinguished from its congeners by the number of ridges in the buccal capsule, the number and arrangement of caudal papillae, the length and morphology of the right spicule, vulvar lip morphology and the number of mucrons on the female tail. Phylogenetic analyses recovered the new species as closely related to Camallanus, but not nested within the Camallanus spp. clade, thereby supporting the recognition of Serpinema as a valid genus. Serpinema yehi n. sp. represents the second species of the genus described from R. punctularia and the eighth species recorded from Brazil.
SN  - 0031-1820
SN  - 1469-8161
ER  -