Hazelia

Hazelia Temporal range: Chengjiang–Middle Ordovician[1] PreЄ Є O S D C P T J K Pg N
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]

External links

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

References

1. 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 Canadia (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 (Paleontological Society) 71 (6): 994–997. doi:10.2307/1306598 (inactive 2015-01-09). JSTOR 1306598.