Linking adults and cystacanths of a new species of Rhadinorhynchus Lühe, 1911 (Acanthocephala: Rhadinorhynchidae) from the Pacific coast of Mexico by using morphological and molecular data
Por:
Grano-Maldonado, MI, Sereno-Uribe, AL, Payán, JCH, de León, GPP, García-Varela, M
Publicada:
1 feb 2025
Resumen:
During parasitological surveys of marine fishes and zooplankton in localities of the Northwestern Pacific coast of Mexico, 28 Gafftopsail pompano (Trachinotus rhodopus Gill) and 50 mysid crustaceans (Metamysidopsis frankfiersi Hendrickx & Hern & aacute;ndez-Pay & aacute;n) we identified to be infected with adults and cystacanths, respectively of an acanthocephalan morphologically corresponding to the genus Rhadinorhynchus L & uuml;he, 1911. DNA sequences of the small (SSU) and large (LSU) subunits of ribosomal DNA, and cytochrome c oxidase subunit 1 (cox 1) from mitochondrial DNA were obtained. Phylogenetic analyses revealed that the newly sequenced individuals in a clade with Rhadinorhynchus sp. from carangids in other localities of the Pacific coast of Mexico; together, all these individuals formed an independent lineage that is recognized herein as a new species, Rhadinorhynchus trachinotin. sp. The new species is morphologically distinguished from the other 38 congeners by having a long and cylindrical proboscis armed with 12 longitudinal rows bearing 16-18 hooks each. The ecological information gathered from the parasites, together with genetic evidence, confirms that the Gafftopsail pompano is the definitive host of R. trachinotin. sp., while mysid crustaceans serve as the intermediate host. Current records also indicate that R. trachinotin. sp. is distributed along the Pacific coast of Mexico, from Mazatl & aacute;n, Sinaloa in the north to Puerto Angel, Oaxaca in the south. This distribution aligns with the Mexican Coastal Current, which extends from the Gulf of Tehuantepec in Oaxaca to the entrance of the Gulf of California and southern Baja California.
Filiaciones:
Grano-Maldonado, MI:
Univ Autonoma Sinaloa, Fac Ciencias Mar, Ave Claussen S-N, Mazatlan, Sinaloa, Mexico
Sereno-Uribe, AL:
Univ Nacl Autonoma Mexico, Dept Zool, Inst Biol, Mexico City 04510, Mexico
Payán, JCH:
Univ Nacl Autonoma Mexico, Posgrad Ciencias Mar & Limnol, Ave Ciudad Univ 3000, Coyoacan 04510, Mexico
de León, GPP:
Univ Nacl Autonoma Mexico, Escuela Nacl Estudios Super Unidad Merida, Tablaje Catastral 6998,Carretera Merida Tetiz Km 4, Merida 97357, Yucatan, Mexico
García-Varela, M:
Univ Nacl Autonoma Mexico, Dept Zool, Inst Biol, Mexico City 04510, Mexico
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