Arachnoides
Arachnoides is a genus of sea urchin within the family Clypeasteridae, found in the Indo-Pacific oceans. The base is flat and the upper surface is convex.
Species
The World Register of Marine Species list the following species as being in this genus:-- Arachnoides placenta Australia to Philippines
- Arachnoides tenuis H. L. Clark, 1938 Western Australia