Hazelia is a genus of spicular Cambrian demosponge known from the Burgess Shale, the Marjum formation of Utah,[3] and possibly Chengjiang.[1] It was described by Charles Walcott in 1920. Its tracts are mainly radial and anastomose to form an irregular skeleton.[3] Its oxeas form a fine net in the skin of the sponge.[3]

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