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Elthusa alvaradoensis n. sp. (Isopoda, Cymothoidae) from the gill chamber of the lizardfish, Synodus foetens (Linnaeus, 1766)

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Elthusa alvaradoensis n. sp. is described and figured. The species, a branchial parasite of the inshore lizardfish, Synodus foetens (Linnaeus, 1766), was collected on the coast of central Veracruz, Mexico. E. alvaradoensis is characterized by: the wide pleon and pleotelson being notably wider than the pereon, the relatively acute pleonite lateral margins, pleonite 1 as wide as pleonite 2 and pleotelson, short antennule and antenna (with 7 and 12–14 articles, respectively, in adult females and 4 and 7 in males), and the uropodal rami being subequal in length with subacute apices. The new species described here accords well with the generic characters of Elthusa, but pereopod 5–7 lack a carina. The distribution of the genus is here extended into the tropical western North Atlantic. Elthusa alvaradoensis n. sp. es descrita e ilustrada. La especie es un parásito branquial del "lagarto máximo", Synodus foetens (Linnaeus, 1766), fue colectado en la costa central de Veracruz, México. E. alvaradoensis es caracterizada por: pleon y pleotelson notablemente más amplios que el pereon, márgenes laterales de los pleonitos relativamente agudos, pleonito 1 tan amplio como el pleonito 2 y el pleotelson, antenula mas corta que la antena (con 7 y 12–14 en hembras adultas y en machos 4 y 7, artículos respectivamente), rami del urópodo con los ápices subagudos y subiguales en longitud. La nueva especie aquí descrita concuerda con las características genéricas de Elthusa, pero los pereópodos 5–7 carecen de carina. La distribución del género se extiende en el Atlántico Norte occidental tropical.


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