Nielsen, C. (abril 2008) Six major steps in animal evolution: are we derived sponge larvae?Архивная копия от 7 марта 2016 на Wayback Machine Evolution & Development, Vol. 10, No. 2., pp. 241-257. doi:10.1111/j.1525-142X.2008.00231.x Key: citeulike:2484586. Consultado el 15 de enero de 2012 «The metazoan ancestor, «choanoblastaea», was a pelagic sphere consisting of choanocytes.»
Nielsen, C. (abril 2008) Six major steps in animal evolution: are we derived sponge larvae?Архивная копия от 7 марта 2016 на Wayback Machine Evolution & Development, Vol. 10, No. 2., pp. 241-257. doi:10.1111/j.1525-142X.2008.00231.x Key: citeulike:2484586. Consultado el 15 de enero de 2012 «The metazoan ancestor, «choanoblastaea», was a pelagic sphere consisting of choanocytes.»