Anatomical and histological structure of the hindgut in adult P. scaber A anatomical structure and hindgut regions. Lines B, C, D, E, and F denote where the cross-sections depicted in images B, C, D, E and F were made B cross-section across the anterior part of the anterior chamber C cross-section across the posterior part of the anterior chamber D cross-section across the papillate region E cross-section across sphincter F cross-section across rectum. Abbreviations: C1 – curved cells forming the typhlosole; C2 – wide cells enclosing the typhlosole channels; C3 – curved cells forming ridges on each side of the typhlosole; FG – foregut; HE – hindgut epithelium; HG – hindgut; HP – hepatopancreas; LC – lateral cells; M – muscles; T – typhlosole; TC – typhlosole channels; VC – ventral cells.