The idiosoma of orthoadenic Gamasina (Mesostigmata) bears a maximum complement of 47 pairs of discernible cuticular organs that are distinct from setae. Superficially, 15 pairs appear secretory (gland pores) (four podonotal, four opisthonotal, one peritrematal, and six ventral) and 32 pairs (five podonotal, 13 opisthonotal, three on the peritrematal shield, 12 ventral) non-secretory (poroids); five pairs of gland openings and 18 pairs of poroids appearing at the larval instar, eight pairs of glands and 10 pairs of poroids are added at the protonymph, and two pairs of glands and two more pairs of poroids appear at the deutonymphal instar. The neoadenic condition observed in monogynaspid Gamasines (Zerconidae, Epicriidae, Heatherellidae, and other families of Dermanyssina mites), some Uropodina and Trigynaspina mites is due to the duplication or multiplication of several dorsal, peritrematal, and ventral glands forming glandular areas or groups, as well as the apparition of new glands, which complement the existing orthoadenic provision. The neoadeny begins in the protonymphal instar through the duplication of certain larval glands and continues with other duplications of larval and postlarval glands along with the appearance of new ones in the deutonymph. The addition of several newly identified pore-like structures to the complement given by Athias-Henriot (1969, 1975) is given and several changes in notation for idiosomal organs following Athias-Henriot are proposed. The homologies of cuticular organs are based on the topographic position of each on the idiosomal surface and on their ontogenies. Ontogeny appears to be useful in identifying glands, poroids and setae, although some organs can accelerate or delay their ontogeny.