Lions mane jelly (Cyanea capillata)

Beware the sting in the tail (or more correctly the tentacles) with this one. It can grow to 18" across in British waters, and larger elsewhere, with tentacles extending for several metres in length. It is best to keep well clear when you se it. Remember that the tentacles can get caught on shot or anchor ropes ready waiting for the ascending / descending diver or those retrieving the shot/anchor. Particularly avoid wiping your face with gloved hand in case you transfer some of the nematocysts (stinging cells) The sting can be very painful and may in some individuals result in an allergic reaction. Vinegar may be useful in neutralising and alleviating the effects.

 Cyanea lamarckii

As with its red lions mane relative, this is a species to be wary of.

Rosehearty, Aberdeenshire

Moon jelly (Aurelia aurita)

The most common jellyfish found in the area, often seen in swarms of hundreds if not thousands. Although possessing stinging cells these are not normally a problem to humans. It is distinguished by the 4 pale violet crescents on the underside which are the reproductive organs. Although generally much smaller they may grow to about 12" in diameter.

Gamrie Bay, Aberdeenshire

Rhizostoma pulmo

This very infrequently encountered species is like a giant space ship slowly pulsing its way through the water. It can grow to several feet across with similar length.

Rosehearty, Aberdeenshire

Comb jellies

Not actually cnidaria, but ctenophores they do not have stinging cells. Often overlooked particularly during ascents and descents there are many varieties which are generally less than an inch in diameter.