Abstract. We describe a new species of the genus Notonecta, i.e. Notonecta mazzoniae n. sp. from the Lower Cretaceous of Argentina. It is the fi rst fossil representative of the family described from South America, demonstrating the great antiquity of the genus, bearing identical ventral chaetal system correlated wih respiratory for such a long period. The new species is recorded only by immature stages from the second to the fi fth instars. Specimens are considered to be exuviae and not body fossils. Absence of body fossils may be due to taphonomic bias instead of palaeoecological constrains. In addition we found some specimens of Anisopinae, also considered as nymph exuviae, which represent the oldest record of the taxon.
Résumé. Le genre récent
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