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Aspects of the reproduction of Bopyrinella thorii (Richardson, 1904) (Isopoda, Bopyridae), a branchial parasite of Thor floridanus Kingsley, 1878 (Decapoda, Hippolytidae) in Bahía de la Ascensión, Mexican Caribbean

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The association of Bopyrinella thorii (Richardson, 1904) with Thor floridanus Kingsley, 1878 in seagrass beds of the Mexican Caribbean has been previously reported upon, although without mention of other data relative to the parasitic species' biology. The purpose of this study was to provide information on reproductive aspects of B. thorii from Bahía de la Ascensión, Caribbean coast of Mexico. We estimated that B. thorii females initiate reproduction at 1.75 mm total length (TL) and that the size at sexual maturity is 2.1 mm ± 0.95 TL. The fecundity of B. thorii varied from 83 eggs in smaller females to 1,036 eggs in larger ones. The relationship between the number of eggs and the total length of the females was significant (r = 0.769). This relationship, however, was not progressive, as females of one same size presented a variable number of eggs, particularly in the larger specimens. The size of B. thorii eggs varied from 0.113 to 0.175 mm in the egg to embryo II phases, and the size of the epicaridium larvae varied from 0.176 to 0.213 mm. No differences were observed in the size and developmental phase of the eggs within a single brood. La asociación de Bopyrinella thorii (Richardson, 1904) con Thor floridanus Kingsley, 1878 en praderas de pastos marinos del Caribe mexicano, se ha reportado previamente sin aportar mayor información sobre la biología del parásito involucrado. El presente trabajo tiene como objetivo proporcionar información sobre aspectos reproductivos de B. thorii en la Bahía de la Ascensión, costa del Caribe Mexicano. Se estimó que las hembras de B. thorii inician su reproducción cuando alcanzan 1,75 mm de longitud total (LT) y que la talla de madurez sexual de la especie es de 2,1 mm ± 0,95 (LT). La fecundidad de B. thorii varió de 83 huevos en las hembras más pequeñas a 1036 huevos en las de mayor tamaño. La relación entre el número de huevos y la longitud total de la hembra es significativa (r = 0,769) aunque no progresiva, pues se observó variación en el número de huevos entre hembras de la misma talla, la cual fue más marcada en las hembras más grandes. El tamaño de los huevos de B. thorii fue de 0,113 a 0,175 mm en las fases huevo a embrión II; y el tamaño de las larvas epicaridium varió de 0,176 a 0,213 mm. No se observó variación en el tamaño y fase de desarrollo de los huevos de una misma masa ovígera.

Affiliations: 1: Laboratorio de Carcinoparasitología, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México (UNAM), Apartado Postal 70-305, Ciudad Universitaria, Mexico, D. F. 04510, Mexico


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