Hazelia

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]

Hazelia Temporal range: Chengjiang–Middle Ordovician[1] PreꞒ Ꞓ 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:	†Protomonaxonida
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[3] H. grandis Walcott, 1920 H. luteria Rigby, 1986 H. obscura Walcott, 1920 H. lobata Rigby & Collins, 2004[3]

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]

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 Canadiana (2).
3. 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. 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.

External links

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