Cryptodendrum adhaesivum
Липкий морской анемон. Adhesive sea anemone. Cryptodendrum adhaesivum. (Thalassianthidae).
cryptodendrum adhaesivum
Pizza anemone (Cryptodendrum adhaesivum)
Venomous© Russell Gilbert
Invertebrate · Stinging · Sea anemones

Pizza Anemone

Cryptodendrum adhaesivum (Klunzinger, 1877)
syn. Cryptodendron adhaesivium, Cryptodendron adhaesivum, Cryptodendrum adhesivum, Stoichactis digitata
up to 30 cm across1-20 mVenomous
1

An anemone with two different tentacle types on one disc: short, branched, densely packed ones over the centre, and longer simple ones around the rim, so the surface reads as tight pile carpet with a fringe. Colour is frequently zoned - a pink centre in a green surround, or yellow against grey - and the disc reaches about 30 cm (12 in).

The English name comes from the look of that zoned, densely covered disc, but the surface is the thing to remember: the tentacles are unusually sticky, adhering firmly to anything that brushes them, and this is one of the few reef anemones capable of a sting a diver will remember. Only one clownfish, Clark's anemonefish, is known to settle in it at all, and on these reefs it more often sits unoccupied at the base of a coral head, half-buried in sand. Approach it as a photograph and nothing else: the grip is strong enough that pulling free tears both the tentacles and, sometimes, skin.

How to recognise it
  • two kinds of tentacle - short branched ones in the centre, longer at the edge
  • surface looks like tight pile carpet or moss
  • colours often in two contrasting zones, pink, green or yellow
  • disc up to 30 cm across

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Last Update: August 8, 2026