Asterstreidia
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![](http://static.miraheze.org/sagan4betawiki/e/e4/Extant.jpg)
Asterstreidia are sessile, cnidarian-like Asterzoa. They use modified bait cells to attach to shells or flora, and they have free-swimming developmental stages.
Subgroups
Gymnopolypia (Class)
The class which contains all extant Asterstreidians.