Attributing jellyfish stings to particular species is typically problematical. Often, stings and symptoms such as red patches, whitish wheals, pian, and tenderness can occur from a wide variety of species’ stings. Sticky-tape or skin-scraping samples may be helpful for identification in some 〖cases,〗^(24 ) but are rarely taken and require expert 〖 identification.〗^25 The two most reliable types of stings to diagnose in the field or in a clinical context are form chirodropids and Irukandjies, as described above. For the Thai cases herein, the stigns and symptoms were almost a perfect match with those in Australia. We have confirmed the presence of both large chirodropids and at least two typas of Irukandji jellyfish in Thailand, all new to science (Gershwin: i.d. photos held by Divers Alert Network); it remains unclear at this time how many life-threatening jellyfish species live in Thai waters, or which ones were responsible for each case.