Retraction of a zooid of Stephanella hina Schwaha, Thomas Retraction MovingImage video/quicktime 384663552 bytes o:441003 hdl:11353/10.441003 http://phaidra.univie.ac.at/o:441003 eng CC BY-NC-SA 4.0 International http://creativecommons.org/licenses/by-nc-sa/4.0/