“…Gamete binding in many species has been proposed to involve interactions between proteins on sperm and glycoconjugates on the egg surface (Mengerink and Vacquier, 2001;Evans, 2012;Clark, 2013Clark, , 2014. In particular, experimental evidence suggest that sperm surface glycosidases could act in a non-catalytic or lectinlike manner, recognizing complementary sugar moieties in the egg envelope (Miranda et al, 2000;Martinez et al, 2000;Perotti et al, 2001;Miller et al, 2002;Intra et al, 2006;Zitta et al, 2006;Hedrick, 2008;Honegger and Koyanagi, 2008;Intra et al, 2011). Examples of glycosidases on the sperm plasma membrane include mannosidases and fucosidases in mammalian sperm (Tulsiani et al, 1989(Tulsiani et al, , 1990Venditti et al, 2010;Phopin et al, 2012Phopin et al, , 2013, fucosidases and N-acetylglucosaminidases in tunicates (Hoshi et al, 1983(Hoshi et al, , 1985(Hoshi et al, , 1994Hoshi, 1986;Godknecht and Honegger, 1991;Matsumoto et al, 2002;Downey and Lambert, 1994), and mannosidases, fucosidases and N-acetylglucosaminidases in flies (Cattaneo et al, 1997(Cattaneo et al, , 2002Pasini et al, 1999;Perotti et al, 2001;Intra et al, 2006Intra et al, , 2009Intra et al, , 2011.…”