Living in the water column above the bottom of a water body (e.g. sea, lake, or river).
Elacatinus jarocho M.S. Taylor & L. Akins, 2007
Pseudotocinclus (Genus) Nichols, 1919
Euaugaptilus hyperboreus Brodsky, 1950
Clione (Genus) - sea-butterfly
Stylocheilus longicauda (Quoy & Gaimard, 1825) - longtail seacat
Paleanotus heteroseta O. Hartman, 1945
Yndolaciidae (Family) Støp-Bowitz, 1987
Bolinopsis infundibulum (O.F. Müller, 1776)
Dryodora glandiformis (Mertens, 1833)
Mertensia ovum (Fabricius, 1780)
Oikopleura labradoriensis
Plotocnide borealis Wagner, 1885
Thysanostoma (Genus) L. Agassiz, 1862