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Full Access Caecidotea xochimilca (Isopoda, Asellidae), a new species from Lake Xochimilco, Mexico, with a key to Mexican species of the genus Caecidotea

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Caecidotea xochimilca (Isopoda, Asellidae), a new species from Lake Xochimilco, Mexico, with a key to Mexican species of the genus Caecidotea

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Caecidotea xochimilca n. sp. is described from specimens found in the roots of the water hyacinth in Lake Xochimilco, Mexico City. There are two other epigean Mexican species: Caecidotea xochimilca n. sp. differs from C. williamsi Escobar-Briones & Alcocer, 2002 by the shape of the palmar processes on male pereopod 1, and the aesthetasc formula and number of flagellar articles in antenna 2. Caecidotea puebla Cole & Minkley, 1968 differs from the new species by the body proportions, the number of flagellar articles in antenna 1 and antenna 2, the flagellum of antenna 1 reaching to the distal border of the peduncle of antenna 2 when reflected, a lateral sinuosity in the exopod of pleopod 2 of the female, the number of setae in pleopods 4 and 5, and uropodal characters. A key for the Mexican species of the genus is given. Caecidotea xochimilca n. sp. es descrita de especímenes encontrados en la raíz de lirio acuático del Lago de Xochimilco, Ciudad de México. Hay otras dos especies Mexicanas epigeas. Caecidotea xochimilca n. sp. difiere de C. williamsi Escobar-Briones & Alcocer, 2002 por tener diferente la forma del proceso palmar del pereópodo 1 del macho, la formula de aestetascos y el número de artejos flagelares en la antena 2. Caecidotea puebla Cole & Minkley, 1968 difiere de la especie nueva por la proporción del cuerpo, el número de artejos flagelares en la antena 1 y antena 2, el flagelo de la antena 1 cuando está extendido alcanza el borde distal del pedúnculo de la antena 2, la sinuosidad lateral en el exópodo del pleópodo 2 de la hembra, número de setas en los pleópodos 4 y 5 y las características del urópodo. Se proporciona una clave para especies mexicanas del género.

Affiliations: 1: Laboratorio de Ecología, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Av. de los Barrios #1, Los Reyes Iztacala, CP 54090 Tlalnepantla, Estado de México, Mexico

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