Yunotubus is a five-specimen early Cambrian fossil colony tested within Pterobranchia; its tubes, zooids and stolon are kept separate from the scored topology.
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Five Yunotubus specimens from the approximately 516 Ma Hongjingshao Formation provide a diagnostic early Cambrian pterobranch minimum, not a Pterobranchia origin date or proof that every older tube fragment belongs to the clade.
claim:taxon:pterobranchia:fossil-rangeYunotubus directly records a pterobranch colony in the approximately 516 Ma Xiaoshiba Lagerstätte of Yunnan; this locality sample does not establish a complete early Cambrian or global pterobranch distribution.
claim:taxon:pterobranchia:biogeographyYunotubus combines fusellar tubes, zooids and a connecting stolon recovered within Pterobranchia by sampled morphology matrices, while that placement remains a scored phylogenetic hypothesis rather than observed ancestry.
claim:taxon:pterobranchia:taxonomyVideo and electron microscopy directly document suspension feeding by millimetre-scale, tube-dwelling zooids of living Rhabdopleura normani; this sampled ecology is not projected unchanged onto fossil pterobranchs.
claim:taxon:pterobranchia:ecologyYunotubus preserves colonial zooids connected by a stolon inside fusellar tubes, whereas living Rhabdopleura supplies direct tentacle and ciliary anatomy; the traits come from different sampled taxa and times.
claim:taxon:pterobranchia:morphology