The present study represents the first record of Hydrozoan medusae Geryonia proboscidalis off of
Gökçeada island in June 2021. Although this species is found in the Mediterranean, it is the first
record specifically in the coastal areas of Gökçeada island. Holidaymakers are extremely irritated
by the sting of Geryonia proboscidalis, especially with its sudden accumulation in the coastal areas
of Gökçeada island.