Is cleistospermy and coenospermy related to sperm transfer?: a comparative study of the male reproductive system of Pachygrapsus transversus and Pachygrapsus gracilis (Brachyura: Grapsidae) - Tiseo, Gisele R; Mantelatto, Fernando Luis Medina; Zara, Fernando J (Journal of Crustacean Biology, 2014)