Sex change and life history pattern in the shrimp Thor manningi (Decapoda: Caridea): A novel case of partial protandric hermaphroditism. Male reproductive function which is still available in euhermaphrodite-phase shrimp should be due to the existence of the gland.īauer, R., 1986. Our results indicated that for the individuals that will become euhermaphrodite, the cellular structure of AG changes since transitional phase. The nucleus diameters are similar in the three phases while the nucleus- to-cell ratio is the lowest in euhermaphrodite phase. The gland cell clusters surrounding the ejaculatory ducts locate at the roots of the fifth pereopods. The results showed that AG exists in the male in transitional and euhermaphrodite phases. So AG cell structure might be different in three phases in L. Considering the male reproductive function acts in its lifespan except for at larval stages, and female reproductive system starts to develop at transitional phase, we hypothesized that AG activity might be reduced to allow and promote vitellogenesis onset in early transitional phase and the following euhermaphrodite phase. However, it can be fertilized as a female immediately after molting. Euhermaphrodite-phase shrimp acts as male at intermolts. The peppermint shrimp matures as male first, then some individuals may become euhermaphrodite after several moltings (transitional phase). In the present study, we investigated the histological characteristics of the androgenic gland of peppermint shrimp, Lysmata wurdemanni. ![]() ![]() The androgenic gland (AG) is an important endocrine gland for male reproductive function in crustaceans.
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