Nemanthus annamensis, commonly known as the gorgonian wrapper, is a species of sea anemone found in central Indo-Pacific waters.

[1] Nemanthus annamensis has a rather variably shaped base and low, spreading column, widening slightly just below the oral disc.

The column and tentacles are white, yellowish or orange, variegated with dark patches, and the oral disc is semi-transparent.

In this instance, the crab was carrying a specimen of N. annamensis, holding it in place with cheliped-like structures on the end of its fourth and fifth pairs of legs.

[2] The sea anemone was not attached to the crab's shell and seemed to be happy with being carried around as it extended its tentacles in a normal manner.