細い枝状

https://sites.google.com/site/kokemushiweb/gallery/calcified/cyclostomata/branching/articulated

枝は関節を介して連なる・個虫は主に2列に並ぶ

https://sites.google.com/site/kokemushiweb/gallery/calcified/cyclostomata/branching/tubuliporidae

枝は関節をもたず,細い管状の個虫が枝分かれする