Scyphozoa; True Jellyfish

Scyphozoa are not fish in any way – it is more accurate to call them Sea Jellies. They are something special to encounter when diving around Ko Phangan. Most of our species don’t have long tentacles with stinging cells and make beautiful subjects for underwater photography.

Catostylus townsendi; Rhizostome Sea Jelly

Probably not Catostylus mosaicus, because of the small coloured spots on its body.

Phyllorhiza punctata; Rhizostome Sea Jelly

The Australian blue-spotted Jellyfish is our most common Rhizostome jelly.

Versuriga anadyomene; Rhizostome Sea Jelly

This communal beast is not Thysanostoma thysanura, as we used to think!

Other Rhizostome Sea Jellies

Various other chunky Sea Jellies without those long, nasty tentacles.

Pelagiidae; Semaeostome Sea Jellies

Known as the Sea Nettles, their stomachs lead to radiating pouches which are separate and non-branching. They lack a ring canal and the tentacles come from its umbrella margin in clefts between the lappets!

Other Semaeostome Jellyfish

Lions mane and moon jellies. We have a feeling that the medusa should be filed in the hydroids, but as it looks like a jellyfish, here it stays....