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First reports of 5 species of scale insects are given for the Comoros (Prococcus acutissimus, Pulvinaria psidii, Paracoccus burnerae, Planococcus minor, Unaspis citri,) and 8 species for the Seychelles (Protopulvinaria pyriformis, Nipaecoccus viridis, Phenacoccus madeireinis, Phenacoccus parvus, Pseudococcus jackbeardsleyi, Saccharucoccus sacchari, Conchaspi angraeci, Aulacaspis tubercularis)

The status of knowledge on the entomofauna of La Réunion appears quite variable depending on the insect order considered. While Coleoptera and Lepidoptera have received sustained attention, it is only recently that some other groups such as Odonata, Dictyoptera, Thysanoptera or Hemiptera Auchenorrhyncha have been extensively studied. Other important orders such as Diptera and Hymenoptera appear to be far less known and will require extensive studies in the future. Within the on going process of the creation of a National Park in the highlands of La Réunion, a series of studies was initiated by the "Mission Parc National des Hauts de la Réunion", aiming at synthetising the current knowledge on various groups of plant and animals. CIRAD was in charge of the work on entomofauna. In collaboration with the Natural History Museum, the Insectarium of La Réunion and some individual specialists, an attempt was made to synthetize the current status of knowledge on the different insect orders based on existing literature records. The attention was focused on four groups (Odonata, Hemiptera Auchenorrhyncha, Coleoptera, Lepidoptera) selected on the base of their knowledge status or their possible interest as bio-indicators. All endemic taxa from La Réunion or from the Mascarenes were listed and their known geographical distribution precised. The corresponding database was used with GIS to draw maps of areas showing a particular interest for the conservation of these endemic taxa. Further studies should be conducted to extend to database to all orders of insects and other group of arthropods. (Texte intégral)

To our present knowledge Auchenorrhyncha are represented in Reunion island by 102 species described : 66 Fulgoromorpha and 36 Cicadomorpha. Inmost of the undisturbed biotopes studied, Fulgoromorpha show more significant diversity than Cicadomorpha. Except for Delphacidae and Flatidae which feed primarily on exotic plants, the other families of the Fulgoromorpha are characterised by a strong proportion of endemic species mainly dependent on indigenous plants. Our research shows preferential trophic relation between some Fulgoromorpha families or species and particular plant taxa. This is the case with Derbidae which are all associated with indigenous Monocotyledones. Achilidae and a new endemic species of Meenoplidae attached to the new genus Insulisia Bonfils,1998, seem to be monophagous on some indigenous plants. Cixiidae and other families are mostly polyphagous but linked with indigenous plants. These preferential associations between endemic Fulgoromorpha and indigenous plants allow to provide informations on the structure and evolution of ecosystems in Reunion island. With the objective of maintaining the original character of Reunion biodiversity, these studies would allow to direct conservation decisions for this endangered insular biotope. Lastly, these results also open new fields of research : comparative studies of the evolution of Mascarene islands environments, as well as modalities of Mascarenes colonization by Auchenorrhyncha.