Arachnanthus is a genus of tube-dwelling anemones in the family Arachnactidae.

Members of the genus are found worldwide.

Arachnanthus species live in parchment-like tubes which are buried in muddy or sandy sediment.

The following species are currently included in the genus according to the World Register of Marine Species:[1] Arachnanthus nocturnus den Hartog, 1977 is now accepted as Isarachnanthus nocturnus (Hartog, 1977).

This class Anthozoa related article is a stub.