Maschwitz, "Secretion-grooming in the water bug Plea minutissima: a chemical defence against microorganisms interfering with the hydrofuge properties of the respiratory region," Ecological Entomology, vol.
Maschwitz, "Secretion-grooming in aquatic beetles (Hydradephaga): a chemical protection against contamination of the hydrofuge respiratory region," Chemoecology, vol.
For parthenogenetic females and both sexes of bisexual adults, we observed 6 types of sensilla, including hydrofuge
scales, trichoid sensilla, 2 types of squamiform sensilla, tuft hairs and Bohm bristles.
One more important bioproperty- chemical polarity of the compounds and structures (water and hydrofuge
organics, alkaline and acid parts of amino acids, polypeptide and polynucleotide chains)- was added to this group by the author.