''Chaceus'' is a genus of

crab Crabs are decapod crustaceans of the infraorder Brachyura (meaning "short tailed" in Greek language, Greek), which typically have a very short projecting tail-like abdomen#Arthropoda, abdomen, usually hidden entirely under the Thorax (arthropo ...

s in the family

Pseudothelphusidae Pseudothelphusidae is a family of freshwater crabs found chiefly in mountain streams in the Neotropics. They are believed to have originated in the Greater Antilles and then crossed to Central America via a Pliocene land bridge. Some species of t ...

, containing the following species: The genus' name commemorates Fenner A. Chace Jr.

References

Pseudothelphusidae {{Pseudothelphusoidea-stub