in taxon secretory cell eukaryotic cell oenocyte Oenocytes are highly variable in size, shape, cluster formation and anatomical location. In adults, oenocytes tend to be smaller but more numerous than in larvae. While oenocytes have been found in arachnids and crustaceans, they have been most abundantly described in insects. FBbt:00004995 A secretory cell of ectodermal origin. This cell may have important functions in fatty acid and hydrocarbon metabolism and is metabolically linked to the fat body and tracheae. This cell is exclusive of arthropods. Arthropoda