@Tobias G said: “Do I understand it right, that in order to attain magga phala one needs a tihetuka cuti-patisandhi to the new human or deva bhava? How can a being in the apayas have tihetuka or dvihetuka patisandhi?”
Please download “Chart of citta with Function, Feeling and Roots (Updated 22June2018)” to see for yourself the patisandi function which beings will be reborn:
(1) in woeful realm with “Unwholesome Rootless citta” (akusala ahetuka),
(2) in human realm with deformity with “Wholesome Rootless citta” (kusala ahetuka),
(3) in human or deva realm with “2 or 3 wholesome root citta”,
(4) in fine-material realm with “3 wholesome root citta” and
(5) in immaterial realm with “3 wholesome root citta”.