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Neoechinorhynchus (Neoechinorhynchus) chimalapasensis n. sp. (Acanthocephala: Neoechinorhynchidae) from the freshwater fish Awaous banana (Valenciennes) (Gobiidae) in Mexico
Authors:Guillermo Salgado-Maldonado  Juan Manuel Caspeta-Mandujano and Emilio Martínez-Ramírez
Institution:(1) Instituto de Biolog?a, Universidad Nacional Aut?noma de M?xico, Apartado Postal 70-153, CP 04510 Mexico, DF, Mexico;(2) Laboratorio de Parasitolog?a de Animales Silvestres, Facultad de Ciencias Biol?gicas y Centro de Investigaciones Biol?gicas, Universidad Aut?noma del Estado de Morelos, Av. Universidad No. 1001, Col. Chamilpa, CP 62209 Cuernavaca, Morelos, Mexico;(3) Departamento de Investigaci?n, ?rea de Acuacultura, Centro Interdisciplinario de Investigaci?n para el Desarrollo Integral Regional, Unidad Oaxaca, Instituto Polit?cnico Nacional (CIDIIR Oaxaca IPN), Oaxaca, Oaxaca State, Mexico
Abstract:Neoechinorhynchus (Neoechinorhynchus) chimalapasensis n. sp. (Eoacanthocephala: Neoechinorhynchidae) is described from the intestine of Awaous banana (Valenciennes) (Pisces: Gobiidae) collected in the Río Negro, a tributary in the upper Río Coatzacoalcos basin, Santa María Chimalapa, Oaxaca State, Mexico. It is the third species of Neoechinorhynchus Stiles & Hassall, 1905 described from Mexican freshwater fishes, although 36 other species are known from freshwater fishes in the Americas. Like four other species of Neoechinorhynchus from freshwater fishes in North America and Mexico, N. (N.) limi Muzzall & Buckner, 1982, (N.) rutili (Müller, 1780) Stiles & Hassall, 1905, N. (N.) salmonis Ching, 1984 and N. (N.) roseus Salgado-Maldonado, 1978, males and females of the new species are less than 20 mm in length, lack conspicuous sexual dimorphism in size, have a small proboscis of about 0.1 mm in length with the largest hooks being the anteriormost, about 30–90 μm in length and of equal size, and have subequal lemnisci, larger than the proboscis receptacle but still relatively short and, in males, generally restricted to a position considerably anterior to the testes. The new species is closest to N. (N.) roseus, but it is distinguished from it by having: (1) a slightly larger cylindrical proboscis with almost parallel sides versus a globular proboscis with a rounded tip which is shorter and somewhat wider in N. (N.) roseus; (2) smaller but robust anterior proboscis hooks that do not reach the equatorial level or extend beyond the hooks of the middle circle as in N. (N.) roseus; and (3) the female gonopore situated ventrally subterminal, as opposed to being a significant distance anteriorly to the posterior extremity in N. (N.) roseus.
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