An irukandji jellyfish that almost killed a six-year-old boy off Wellington Point has been identified as one of the most venomous ever found in Moreton Bay.

Bay View State School student Sebastian Murphy was taken to Lady Cilento Hospital after being stung on the leg in knee-deep water at the Point on New Year's Eve.

Sebastian Murphy, 6, looks at the Irukandji which stung him at Wellington Point.

His mother Raelene Murphy, 35 of Wellington Point, was also stung and taken by ambulance to Redland Hospital, where she was treated for severe chest pains and cramps.

Paramedics revived Sebastian on the way to hospital after he lost consciousness.