First record of hydrozoan genera Eucheilota McCrady, 1859 and Mitrocomella Haeckel, 1879 and species Porpitaporpita (Linnaeus, 1758) and Physaliaphysalis (Linnaeus, 1758) in Bali, Indonesia.

This report documents the first record of the genera Eucheilota and Mitrocomella and species Porpitaporpita and Physaliaphysalis in Bali, Indonesia, based on observed occurrences in different times and sites. The coincidence of the annual stranding of Physaliaphysalis in the east Bali and south Java coasts during the monsoon periods in Indonesia suggests a link with the upwelling events in the areas. However, more work is needed to analyse this phenomenon and study the occurrences of other Hydromedusae due to the limited data on hydrozoans in Indonesian waters. Overall, this report provides primary data to contribute to the general understanding of the biodiversity of marine organisms in Indonesia.

First envenomation report of the Cnidarian Physalia physalis in Indonesia.

Despite the high number of victims every year, Physalia physalis's envenomations in Indonesia are scientifically unsounded. This annual event occurred mainly in Java's southern beaches and the Eastern Bali Islands, which are the most tourist destinations. The lack of scientific reports can lead to unaware and uneducated beachgoers resulting in a high number of victims, which in turn may ruin the economic sectors. Thus, this study aimed to report P. physalis's envenomation and its treatments in the southern beaches of the Special Region of Yogyakarta Province. It was based on the 15 beach lifeguards' and the primary health care units' reports in 2019-2020. The envenomation cases varied among beaches and years, whereas the highest number of cases were reported in the most popular beach (Parangtritis beach). The partial beach closing due to the pandemic COVID-19 caused the number of cases in 2020 was slightly lower than that in 2019. The envenomations' general symptoms were oedema and local pain that were treated with 5% food vinegar and hot water, if available. The severe cases (dyspnoea, nausea, vomiting, and cephalgia) were only reported twice in 2019. They were hospitalised in primary health care units; however, many people still practise the traditional non-scientific treatments, particularly in a chaotic situation.