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Temporal range: Chengjiang–Middle Ordovician[1]
A specimen of Hazelia at the Mount Stephen Trilobite Beds
Scientific classification e
Kingdom: Animalia
Phylum: Porifera
Class: Demospongiae
Order: Protomonaxonida
Family: Hazeliidae
Genus: Hazelia
Walcott, 1920
  • H. palmata Walcott, 1920 (type)
  • H. conferta Walcott, 1920
  • H. crateria Rigby, 1986[2]
  • H. delicatula Walcott, 1920
  • H. dignata (Walcott, 1920) Rigby & Collins, 2004[3]
  • H. grandis Walcott, 1920
  • H. luteria Rigby, 1986
  • H. obscura Walcott, 1920
  • H. lobata Rigby & Collins, 2004[3]

Hazelia is a genus of spicular Cambrian demosponge known from the Burgess Shale, the Marjum formation of Utah,[4] and possibly Chengjiang.[1] It was described by Charles Walcott in 1920.[5]

Its tracts are mainly radial and anastomose to form an irregular skeleton.[4] Its oxeas form a fine net in the skin of the sponge.[4]


  1. ^ a b Botting, J. (2007). "'Cambrian' demosponges in the Ordovician of Morocco: Insights into the early evolutionary history of sponges". Geobios. 40 (6): 737–748. doi:10.1016/j.geobios.2007.02.006.
  2. ^ Rigby, J. K. (1986). "Sponges of the Burgess shale (Middle Cambrian), British Columbia". Palaeontographica Canadiana (2).
  3. ^ a b Rigby, J. K.; Collins, D. (2004). "Sponges of the Middle Cambrian Burgess Shale and Stephen Formations, British Columbia". ROM contributions in science. 1. ISBN 0-88854-443-X. ISSN 1710-7768.
  4. ^ a b c J. Keith Rigby; Lloyd F. Gunther; Freida Gunther (1997). "The First Occurrence of the Burgess Shale Demosponge Hazelia palmata Walcott, 1920, in the Cambrian of Utah". Journal of Paleontology. 71 (6): 994–997. JSTOR 1306598.
  5. ^ Walcott, C. D. (1920). "Cambrian geology and paleontology IV:6—Middle Cambrian Spongiae". Smithsonian Miscellaneous Collections. 67: 261–364.

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