Wooster in 1982, this species primarily lives in the tropical waters of the Indo-Pacific region, including Guam and Hawaii.

It is easily recognized by its coloration of a mustard brown or olive that fades into white, with its walking legs dipped in black.

It feeds on detritus, algae, and small invertebrates, helping to break down organic material and promoting nutrient cycling.

[5][7] It exhibits typical shell-swapping behavior, often competing with other hermit crabs for shells that are better suited to their size.

[6] Calcinus guamensis is particularly largely located in tide pools and surge zones, which offer food and protection from predators.