Calcinus hermit crabs from Easter Island, with biogeographic considerations (Crustacea: Anomura: Diogenidae)

From collections made in 1998 and 1999, three species of Calcinus are recorded from Easter I.: Calcinus pascuensis Haig, 1974; C. imperialis Whitelegge, 1901; and C. vachoni Forest, 1958. A redescription of Calcinus pascuensis is given and a neotype is selected. Occurrence of Calcinus imperialis is confirmed by examination of almost 80 specimens, including many juveniles. Calcinus vachoni is recorded for the first time from the island. The Easter I. Calcinus fauna is compared with that of other localities in the Pacific, and biogeographic affinities are discussed.