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Latin american journal of aquatic research

On-line version ISSN 0718-560X

Abstract

GOLDSTEIN, Merari  and  DUPRE, Enrique. The reproductive system of females and males in Cancer setosus (Molina, 1782) (Decapoda, Brachyura). Lat. Am. J. Aquat. Res. [online]. 2010, vol.38, n.2, pp.274-280. ISSN 0718-560X.

Females of the genus Cancer have a spermathecae whose connection with the ovary can be dorsal or ventral, depending on the species. The spermathecae is a structure specialized in receiving the spermatophores released by the male during mating. This study aims to describe and measure the reproductive structures of both sexes in the crab C setosus. Females have a pair of ovaries in an H-type conformation; the anterior lobes are 2.4 times longer than the posterior lobes. The spermathecae has walls that are not extensible and a ventral-type connection with the oviduct, which indicates internal fertilization for this species. Sixty-four percent (64%) of the studied females presented a couple of spermatic blockages. In males, the first pair of pleopods is tubular, with the distal tips pointed and/or open, forming a fold. The second pair of pleopods ends in a funnel structure with 12 side extensions. The two testes are whitish in color and converge in a vas deference (VD) that has three zones: proximal, middle, and posterior. Each of these plays a role in the elaboration of the spermatophores and seminal fluid production.

Keywords : crab; reproductive system; spermathecae; spermatophore; internal fertilization; vas deferens; Cancer setosus; Chile.

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