From Wikipedia, the free encyclopedia
Jump to: navigation, search
Not to be confused with Cotyledon.
Cotyledion tylodes
Temporal range: Cambrian Stage 3
Scientific classification e
Kingdom: Animalia
Superphylum: Lophotrochozoa
Stem group: Entoprocta
Genus: Cotyledion
Species: † C. tylodes
Binomial name
Cotyledion tylodes

Cotyledion is a monotypic genus of stalked filter-feeder known from the Chengjiang lagerstatten. It reached a couple of centimetres in height, and bore a loose scleritome of ovoid sclerites. It has proven difficult to classify; an echinoderm affinity was posited but discarded,[1] and its apparently U-shaped gut and a crown of tentacles seems to place it in the entoprocta stem group.[2]

See also[edit]


  1. ^ Clausen, S. B.; Hou, X. G.; Bergström, J.; Franzén, C. (2010). "The absence of echinoderms from the Lower Cambrian Chengjiang fauna of China: Palaeoecological and palaeogeographical implications". Palaeogeography, Palaeoclimatology, Palaeoecology 294 (3–4): 133. doi:10.1016/j.palaeo.2010.01.001.  edit
  2. ^ Zhang, Z.; Holmer, L. E.; Skovsted, C. B.; Brock, G. A.; Budd, G. E.; Fu, D.; Zhang, X.; Shu, D.; Han, J.; Liu, J.; Wang, H.; Butler, A. N.; Li, G. (2013). "A sclerite-bearing stem group entoproct from the early Cambrian and its implications". Scientific Reports 3. doi:10.1038/srep01066.  edit