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Temporal range: Early Cambrian–lower Upper Cambrian
An oblong piece of rock with fine interconnected starlike details representing the fossil
Detail of a fossil of Chancelloria eros, on display at the Naturhistorisches Museum, Vienna.
Scientific classification e
Kingdom: Animalia
Phylum: incertae sedis
Class: Coeloscleritophora
Order: Chancelloriida
Family: Chancelloriidae
Genus: Chancelloria
Walcott, 1920
  • C. eros Walcott, 1920 (type)
  • C. pentacta Rigby, 1978[1]
  • C. drusilla Walcott, 1920
  • C. libo Walcott, 1920
  • C. yorkensis Walcott, 1920
  • C. maroccana Szduy, 1969[2]
  • C. lenaica Zhuravleva and Korde, 1955
  • C. symmetrica Vassiljeva, 1985
  • C. altaica Romanenko, 1968
  • C. racemifundis Bengtson, 1990

Chancelloria is a genus of early animals known from the Middle Cambrian Burgess Shale, the Comley limestone,[3] the Wheeler Shale,[1] the Bright Angel Shale[4] and elsewhere. It was first described in 1920 by Charles Doolittle Walcott, who regarded them as one of the most primitive groups of sponges.[5] This appears unlikely, and it is currently placed in the enigmatic group Coeloscleritophora.[6] 178 specimens of Chancelloria are known from the Greater Phyllopod bed, where they comprise 0.34% of the community.[7]

External links[edit]


  1. ^ a b Keith Rigby, J. (1978). "Porifera of the Middle Cambrian Wheeler Shale, from the Wheeler Amphitheater, House Range, in Western Utah". Journal of Paleontology. 52 (6): 1325–1345. doi:10.2307/1303938 (inactive 2017-01-31). JSTOR 1303938. 
  2. ^ Sdzuy, K. (1969). "Unter- and mittelkambrische Porifera. (Chancellorida und Hexactinellida)". Palaontologische Zeitschrift. 43 (3–4): 115–147. doi:10.1007/bf02987647. 
  3. ^ Reid, R. E. H. (2009). "Occurrence of Chancelloria Walcott in the Comley Limestone". Geological Magazine. 96 (3): 261. doi:10.1017/S0016756800060271. 
  4. ^ Elliott, D. K.; Martin, D. L. (1987). "Chancelloria, an enigmatic fossil from the Bright Angel Shale (Cambrian) of Grand Canyon, Arizona". Journal of the Arizona-Nevada Academy of Science. 21 (2): 67–72. JSTOR 40024887. 
  5. ^ Walcott, C. D. (1920). "Cambrian geology and paleontology IV:6—Middle Cambrian Spongiae". Smithsonian Miscellaneous Collections. 67: 261–364. 
  6. ^ Bengtson, S.; Hou, X. (2001). "The integument of Cambrian chancelloriids". Acta Palaeontologica Polonica. 46 (1): 1–22. 
  7. ^ Caron, Jean-Bernard; Jackson, Donald A. (October 2006). "Taphonomy of the Greater Phyllopod Bed community, Burgess Shale". PALAIOS. 21 (5): 451–65. doi:10.2110/palo.2003.P05-070R. JSTOR 20173022.