Before revision: Long lasting air layers also occur in aquatic arthropods which breathe via a physical gill (plastron) e. g. the water spider (Argyroneta) and the saucer bug (Aphelocheirus) Air layers are presumably also conductive to the reduction of friction in fast moving animals under water, as is the case for the back swimmer Notonecta.Amabili, M., Giacomello, A., Meloni, S.,& C. M. Casciola, (2015) Unraveling the Salvinia Paradox: Design Principles for Submerged Superhydrophobicity.
After revision: Long lasting air layers also occur in aquatic arthropods which breathe via a physical gill (plastron) e. g. the water spider (Argyroneta) and the saucer bug (Aphelocheirus) Air layers are presumably also conducive to the reduction of friction in fast moving animals under water, as is the case for the back swimmer Notonecta.Amabili, M., Giacomello, A., Meloni, S.,& C. M. Casciola, (2015) Unraveling the Salvinia Paradox: Design Principles for Submerged Superhydrophobicity.