Biology / Unit 10 Bio 2277 short lesson, about 20 seconds
Deuterostomia Defined
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The idea
Deuterostomia groups animals sharing the pattern of Bio 2225, where the first embryonic opening becomes the anus; echinoderms, hemichordates, chordates belong here.
In practice
A sea star and a human both develop by the deuterostome pattern despite very different adult body plans.
Where people slip
Shared deuterostome development does not mean similar adult appearance — this clade spans some of the most divergent plans.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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