“…Z. ostreum is characterized by arched-shape orbits, cephalothorax curved on both sides of the carapace, clypeus emarginate at anterior end, and chelipeds covered with white hairs (Say, 1817;Melo, 1996). It is known to be parasitic on bivalve oysters of the genus Crassostrea Sacco, 1897, including Crassostrea rhizophorae (Guilding, 1828) and Crassostrea virginica (Gmelin, 1791) (Stauber, 1945;Christensen and McDermott, 1958;Beach, 1969;Nascimento and Pereira, 1980;Martins and D'Incao, 1996;Melo, 1996;O'Beirn and Walker, 1999;Sankarankutty and Ferreira, 2001;McDermott, 2009;Almeida et al, 2010;Hanke et al, 2015), which can cause economic losses in aquaculture. Z. ostreum has an interspecific relationship with the oysters' species, feeding on the phytoplankton and zooplankton that these oysters filter (McDermott, 1997;Almeida et al, 2010;Hanke et al, 2015).…”