Phoronis muelleri is a species of marine horseshoe worm in the phylum Phoronida. Like most phoronids, Phoronis muelleri has a biphasic life-cycle consisting of a pelagic larval stage, the actinotrocha, and a benthic, sessile adult stage.Bartolomaeus, Thomas. 1989. Ultrastructure and relationship between protonephridia and metanephridia in Phoronis muelleri (Phoronida). Zoomorphology, 109(2), 113–122. doi:10.1007/bf00312317
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