Above floats the angelic Betta splendens (more commonly known as the Siamese fighting fish or the beta fish). It is a deuterostome due to its development as an embryo. All chordates like this fish, along with echinoderms, hemichordates, and xenoturbelliates, are considered deuterostomes because during their development their anus forms before their mouth. note: lego Luke is behind the glass of the beta tank.
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