Pyuridae Hartmeyer 1908

Body sessile or sometimes borne on a stalk or pedicel. Test tough, wrinkled, opaque and often minutely (sometimes coarsely) spinous; both apertures commonly conspicuously square or four-lobed. Color often red or reddish during life, especially about the apertures. Branchial sac usually with more than four large folds on each side, stigmata usually straight (spiral in a few cases); stomach elongate, tapering into the intestine, and bearing a hepatic organ of small tubes. Gonads few (usually but one on each side), elongate, hermaphroditic, the left commonly in, or partly in, the intestinal loop. No renal sac. (Van Name 1945: 218)

Pyuridae is a family of tunicates.

Species of Halocynthia, Microcosmus and Pyura spp. are eaten as seafoods.