Phyllolithodes is a monospecific genus of king crab in the family Lithodidae.

Its only species, Phyllolithodes papillosus (nicknamed the flatspine triangle crab[3]), lives in the intertidal zone and the subtidal zone.

[4] It can be found as far north as Unalaska in the Aleutian Islands and as far south as San Miguel Island in Southern California.

[4] Phyllolithodes is likely a sister genus of Rhinolithodes.

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