Les Cynipides associés aux <I>Quercus</i> capturés en Corse et description d'une nouvelle espèce de <i>Plagiotrochus</i> (Hymenoptera, Cynipoidea)

Des Cynipidae ont été collectés en Corse, dans différents peuplements de chêne-liège Querus suber et de chêne vert Querus ilex, à l’aide de pièges Malaise et de pièges jaunes. Six espèces cécidogènes du genre Plagiotrochus (P. quer-cusilicis, P. australis, P. britaniae, P. amenti, P. cardiguensis et P. vilageliui Pujade-Villar n. sp.) et une espèce d’Andricus, ainsi que huit espèces commensales (Ceropres cerri, C. clavicornis, Saphonecrus lusitanicus, Saphonecrus barbotini, Saphonecrus haimi, Synergus ilicinus, Synergus crassicornis, and Synergus apicalis) ont été récoltées. Toutes sont signalées pour la première fois de Corse. Plusieurs problèmes nomenclaturaux concernant Andricus niger et Plagiotrochus amenti Tavares sont discutés. Plagiotrochus amenti Tavares, 1902 est mis en synonymie avec Plagiotrochus amenti Kieffer, 1901. Un certain nombre des spécimens d’Andricus collectés demeure indéterminé ; ils ont d’étroites affinités avec Andricus niger et A. burgundus. D’autres spécimens obtenus de galles des rameaux sont proches morphologiquement de Plagiotrochus cardiguensis et appartiennent probablement à cette espèce.The Cynipidae material studied in this work was collected using Malaise and yellow pan traps in various Corsican oak stands, some of them consisting of Quercus suber and others of Querus ilex. Six Plagiotrochus species P. quercusilicis, P. australis, P. britaniae, P. amenti, P. cardiguensis, and P. vilageliui Pujade-Villar n. sp., one Andricus and eight inquiline species (Ceropres cerri, C. clavicornis, Saphonecrus lusitanicus, Saphonecrus barbotini, Saphonecrus haimi, Synergus ilicinus, Synergus crassicornis, and Synergus apicalis) have been collected. All are recorded for the first time from Corsica. Different nomenclaturial problems in Andricus niger and Plagiotrochus amenti denominations are commented upon. Plagiotrochus amenti Tavares, 1902 is presented as a new synonym of Plagiotrochus amenti Kieffer, 1901. Some specimens of undeterminated Andricus were obtained in floral galls of Q. suber; they are closely related to Andricus niger and A. burgundus. Some specimens obtained from twig galls are morphologically related to Plagiotrochus cardiguensis and are probably conspecific with this species.</p

Establishment and new hosts of the non-native seed beetle Stator limbatus (Coleoptera, Chrysomelidae, Bruchinae) on acacias in Europe

Stator limbatus is a phytophagous beetle native to warm regions of North and Central America, feeding on Fabaceae seeds and one of the most polyphagous species within the subfamily Bruchinae, here reported for the first time in Europe and on new hosts. Adult beetles emerged from Acacia spp. seeds collected in the islands of Corsica (France), and Sardinia (Italy). The wide presence in Sardinia and Corsica supports the hypothesis that this alien species was introduced several years ago. In both islands, S. limbatus emerged from Acacia mearnsii seeds, with infestation rates of up to 74.2 and 90.8% in 2019 and 2020, respectively. This seed beetle also emerged from two previously unreported host species, Acacia saligna and A. pycnantha, showing highest infestation rates of 4.0 and 95.1%, respectively. Both Acacia species are reported as new host associations with S. limbatus. Overall, seed infestation rates recorded in 2019 and 2020 indicate that S. limbatus is well established and that Mediterranean bioclimatic conditions are suitable for its population ncrease in size. This study lays the foundations for further research on known and potential host species and the spread and distribution of S. limbatus in Europe