The last common ancestor of animals and choanoflagellates was unicellular, perhaps forming simple colonies; in contrast, the last common ancestor of all eumetazoan animals was a multicellular organism, with differentiated tissues, a definite "body plan", and embryonic development (including gastrulation).
O último antepasado común dos animais e coanoflaxelados era unicelular, e seguramente formaba colonias simples; e ao contrario, o último antepasado común de todos os animais eumetazoos era un organismo multicelular, con tecidos diferenciados e un "plan corporal" definido, e un desenvolvemento embrionario que incluía a gastrulación.