Hazelia

Hazelia
Temporal range: Chengjiang–Middle Ordovician[1]
A specimen of Hazelia at the Mount Stephen Trilobite Beds
Scientific classification
Kingdom:Animalia
Phylum:Porifera
Class:Demospongiae
Order:Monaxonida
Family:Hazeliidae
Genus:Hazelia
Walcott 1920
Species
  • 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
  • H. grandis Walcott, 1920
  • H. luteria Rigby, 1986
  • H. obscura Walcott, 1920
  • H. lobata Rigby & Collins, 2004

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]

  • "Hazelia palmata". Burgess Shale Fossil Gallery. Virtual Museum of Canada. 2011.

References

  1. 1 2 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. 1 2 3 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. doi:10.2307/1306598 (inactive 2018-09-26). JSTOR 1306598.


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