Schematic outline of the reproductive systems of the taxa of the families Unidentiidae, Samlidae fam. n. and Apataidae fam. n. integrated with molecular phylogenetic data. Colour indication of reproductive system characters: ampulla – green; body wall – gray; distal receptaculum seminis – red; female gland mass – yellow; female genital opening – orange; penis and male genital opening – dark blue; penial sheath – pale blue; prostate and prostatic vas deferens – turquoise; proximal receptaculum seminis – pink; supplementary gland – light green.