Lollipop crab - Ixa cylindrus

The lavender-purple coloured Ixa cylindrus is a Leucosid crab species native to the seas around Indonesia and the Philippines. The slow moving crab is sometimes captured for the pet trade, however there’s not much known about this species. I. cylindrus is probably a scavenger, it eats dead material from the ocean floor.

The name Lollipop crab is probably given due to the horizontal appendages on both sides of the fissured carapax of the crab. They are probably defensive structures, comparable to the spikes on other crabs. 

Animalia - Arthropoda - Malacostraca - Decapoda - Leucosiidae - Ixa -
I. cylindrus

Photo-credits:
(x) Ecomarines (x) Crustaceology.com
References:
(x)