The lion's mane jellyfish is a common species of jellyfish that is well known for its painful sting. It is an 8-lobed jelly that is relatively large in northern latitudes (up to 2.5 m) (smaller further south) with thin, silvery tentacles up to 30 m (100 ft.) in length. The tentacles are very sticky, in clusters of eight. Each cluster can contain 65-150 tentacles, arranged in a series of rows. Colourful arms extend from the centre of the bell, which are shorter than the tentacles that extend from the subumbrella. Colour varies with size, and large individuals can be bright red to dark purple, while smaller individuals may be lighter orange or tan coloured. Dead individuals found on beaches can be clear. This species does not form aggregations (Purcell 2003).