“…Nymphal stages move slower than adults and carry sand grains on their bodies, presumably for the purpose of concealment (Bobb 1951 ). Konopko ( 2010Konopko ( , 2012Konopko ( , 2013, , Konopko and Melo ( 2009 ), and Konopko et al ( 2010 provided a series of descriptions of nymphs of the Corixidae from Argentina: Ectemnostega montana (Lundblad), E. quechua (Bachmann), E. stridulata (Hungerford), Sigara schadei (Hungerford), S. denseconscripta (Breddin), Tenagobia incerta Lundblad, T. schadei Lundblad, and Trichocorixa mendozana Jaczewski. Detritus, algae, cladocerans, and larvae of Chironomidae were supplied as food, the nymphs being fed solely with algae.…”