''Gandalfus'' is a genus of

crab Crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" (abdomen) ( el, βραχύς , translit=brachys = short, / = tail), usually hidden entirely under the thorax. They live in all the ...

s belonging to the family

Bythograeidae The Bythograeidae are a small family of blind crabs which live around hydrothermal vents. The family contains 16 species in six genera. Their relationships to other crabs are unclear. They are believed to eat bacteria and other vent organisms. By ...

. The species of this genus are found in Eastern Asia and Australia. Species: *''

Gandalfus puia ''Gandalfus puia'' is the only known New Zealand species of crab in the family Bythograeidae, commonly known as the blind vent crabs. Like other blind vent crabs, it only lives in hydrothermal vent waters. This species was first described in 200 ...

'' *''

Gandalfus yunohana ''Gandalfus yunohana'' is a species of blind crab found on hydrothermal vents on the eastern edge of the Philippine Sea Plate south of Japan. It lives at shallower depths than other members of the family Bythograeidae, at . Because no light penetr ...

References

{{Taxonbar, from=Q18594323 Crabs Decapod genera Organisms named after Tolkien and his works