Each palpacle is a tactile filament, very extensile, without accessory filaments or nematocysts.
Cephalic shield continuous with neck; twelve to fourteen stomachal plates; a posterior pallial filament passing through a notch in shell.
Indeed the genus Oedogonium exhibits a high degree of specialization in its reproductive system, considering that its thallus has not advanced beyond the stage of an unbranched filament.
The anther is developed before the filament, and is always sessile in the first instance, and sometimes continues so.
The anther-lobes are united to the connective, which is either continuous with the filament or articulated with it.