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Type: Article
Published: 2023-09-20
Page range: 469-488
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How many species of genus Lernaeopoda Blainville, 1822 (Siphonostomatoida: Lernaeopodidae) are there in the southwestern Atlantic?

Centro de Estudios Parasitológicos y Vectores (CEPAVE); Consejo Nacional de Investigaciones Científicas y Técnicas; Universidad Nacional de La Plata (CONICET-UNLP); Calle 120 sn e 60 y 64; CP 1900; La Plata; Buenos Aires.
Laboratorio 45; División Vertebrados; Museo de La Plata; Universidad Nacional de La Plata; Paseo del Bosque sn; CP 1900; La Plata; Buenos Aires.
Departamento de Ciencias Acuáticas y Ambientales; Facultad de Ciencias del Mar y Recursos Naturales; Universidad de Antofagasta; Chile
Centro de Investigaciones y Transferencia Golfo San Jorge. Instituto de Investigación en Hidrobiología; Facultad de Ciencias Naturales y Ciencias de la Salud; Universidad Nacional de la Patagonia San Juan Bosco; Gales 49; CP 9100; Trelew; Chubut.
Laboratorio de Fisiología de la Reproducción y Ecología de Peces; Instituto de Biología; Facultad de Ciencias; Universidad de la República; Motevideo; Urguay
Museo de Historia Natural Patagonia M.H.N.P; San Martín y Vucetich 93. Rawson; Argentina.
Escuela de Tecnología Médica y Centro Integrativo de Biología y Química Aplicada (CIBQA); Universidad Bernardo O Higgins; Avenida Viel 1497; CP 8370993; Chile.
Instituto de Biotecnología Ambiental y Salud (INBIAS); Consejo Nacional de Investigaciones Científicas; Universidad Nacional de Rio Cuarto (CONICET-UNRC); Ruta 8 km 601; CP 5800. Rio cuarto; Córdoba.
Wildlife Conservation Society (WCS) de Argentina
Centro de Estudios Parasitológicos y Vectores (CEPAVE); Consejo Nacional de Investigaciones Científicas y Técnicas; Universidad Nacional de La Plata (CONICET-UNLP); Calle 120 sn e 60 y 64; CP 1900; La Plata; Buenos Aires.
Crustacea COI mtDNA Morphology Argentina Uruguay Copepoda Parasites


The family Lernaeopodidae includes 14 genera parasitizing elasmobranchs. Fourteen species of this family have been cited from Argentina, four of which were found on chondrichthyans. Schroederichthys bivius Müller and Henle and Galeorhinus galeus (Linnaeus) from Argentina harbored parasitic copepods of the genus Lernaeopoda. The objective of this study was to identify the species using an integrative approach. The morphology was examined by Optical Microscopy and Scanning Electron Microscopy and the molecular analysis was based on partial sequences of the COI mtDNA gene. Despite differences in the antenna, antennule, mandible, maxilliped and maxillae among the specimens, the morphological and molecular analyses revealed that they belonged to Lernaeopoda bivia Leigh-Sharpe, 1930. The species so far reported for Argentina are L. bivia and L. galei Krøyer, 1837, which are distinguished by the size (less and greater than 7 mm, respectively). Here, we report partial sequences of the COI mtDNA gene of L. bivia for the first time, obtained from eleven specimens attached to the mouth, fins, anal slit and claspers of the two shark hosts. The COI mtDNA gene tree shows that the Lernaeopoda group forms a sister clade with Pseudocharopinus bicaudatus (Krøyer, 1837), while the genus Pseudocharopinus does not appear to be a natural group. We propose that the material described from Argentinean waters as L. galei was misidentified and actually belongs to L. bivia. The wide variability within the specimens of L. bivia emphasizes the importance of using an integrative approach to revise the taxonomy of the Lernaeopoda species from all over the world.



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