Genital organs of M. constantina; NMBE 540542, Azaghar; A situs B outer morphology of male organ C interior of penis. Abbreviations used: a = atrium; ap = annular pad; div = diverticulum; ds = dart sac; ep = epiphallus; fl = flagellum; gm = glandulae mucosae; mrp = penial retractor muscle; p = penis; ped = pedunculus; po = pore of penial papilla; pp2 = second penial papilla; sod = spermoviduct; vd = vas deferens.