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Taxonomy: For all marine species, Project Gastropods uses the taxonomy in the online database WoRMS. When starting a new article, do not use sources of taxonomic information that predate the 2017 revision for all gastropod groups ("Revised Classification, Nomenclator and Typification of Gastropod and Monoplacophoran Families" by Philippe Bouchet & Jean-Pierre Rocroi, Bernhard Hausdorf, Andrzej Kaim, Yasunori Kano, Alexander Nützel, Pavel Parkhaev, Michael Schrödl and Ellen E. Strong in Malacologia, 2017, 61(1–2): 1–526.) (can be dowloaded at Researchgate.net), substituting the previous classification of 2005 Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005). If you need help with any aspect of an article, please leave a note at the Project talk page.
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another pair closely related to this one (Phylliroe atlantica & bucephala), these being the three species of the Phylliroidae family.
there's some that live crawling upon floating material: Fiona pinnata ("only slightly adapted to pelagic life and resembles in habitus the benthic members of the group" - marine spec. id. portal) or Scyllaea pelagica (the sargassum nudi, which at least "can swim upwards by flexing its body vigorously")
but then there's also benthic species that can also swim in bursts, like the spanish dancer.