http://en.wikipedia.org/wiki/Ascidiacea
Colonial ascidians reproduce both asexually and sexually. Colonies can survive for decades. An ascidian colony consists of individual elements called zooids. Zooids within a colony are usually genetically identical and some have a shared circulation. Different colonial ascidian species produce sexually derived offspring by one of two dispersal strategies- Colonial species are either broadcast spawners (long-range dispersal) or philopatric (very short-range dispersal).
Colonial ascidians reproduce both asexually and sexually. Colonies can survive for decades. An ascidian colony consists of individual elements called zooids. Zooids within a colony are usually genetically identical and some have a shared circulation. Different colonial ascidian species produce sexually derived offspring by one of two dispersal strategies- Colonial species are either broadcast spawners (long-range dispersal) or philopatric (very short-range dispersal).
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