Typhlosole morphogenesis in the hindgut of P. scaber A typhlosole primordium (arrow) in hindgut of late embryo of stage S18 B typhlosole in the anterior chamber of marsupial manca C typhlosole in the anterior part of the anterior chamber in postmarsupial manca D typhlosole in the posterior part of the anterior chamber near the transition to the papillate region in postmarsupial manca E typhlosole in the anterior part of the anterior chamber in adult animal F typhlosole in the posterior part of the anterior chamber near the transition to the papillate region in adult animal. Abbreviations: T – typhlosole; TC – typhlosole channels.