A suckerlike structure enclosing the genital pore of flukes of the family Heterophyidae.
[G. gonos, offspring, + tylē, knob]
References in periodicals archive ?
Genital pore oval; gonotyl with 20-23 digitiform pockets.
Ventrogenital sac surrounded by glandular cells, with a conspicuous gonotyl with at least 23 digitiform pockets, genital pore large, oval shaped, immediately preceding the genitall sac.
Seminal vesicle free in parenchyma, sometimes coiled; oral sucker large, terminal; gonotyl present in some genera; pre- and post-acetabular pits usually present .