Corps en ovale allongé, convexe, couvert d'une dense pubescence dorée, entièrement jaune-brun avec de nombreuses petites taches noires sur les élytres. Les antennes sont jaune-brun avec l'apex rembruni. Le pronotum est fortement transverse, à côtés arrondis, fortement rétréci en arrière, finement ponctué avec deux fossettes médianes, plus étroit que la base des élytres. Les élytres sont finement et densément ponctués avec l'apex arrondi. Les antennes dépassent la base des élytres de trois articles.
Détermination
Difficile.
Espèces proches
Pyrrhalta viburni est plus grande et ne vit pas dans le même milieu. Ophraella communa, autre petite espèce invasive qui vit sur les ambroisies, a des lignes longitudinales noires sur les élytres.
Période d'observation
Les adultes s'observent d'août à novembre.
Biologie-éthologie
Espèce phytophage dont les larves se développent sur Atriplex halimus. Les adultes se trouvent sur les feuilles de leur plante-hôte.
Biogéographie-écologie
Cette espèce invasive d'origine nord-américaine s'est répandue récemment dans les milieux littoraux du Bassin méditerranéen.
Sources
Alonso, C. & Lefebvre, V. 2022. Découverte en France continentale et en Corse de Monoxia obesula Blake, 1939 (Coleoptera Chrysomelidae Galerucinae). L'Entomologiste, 78: 29-32.
The map presents a summary at the 10 x 10 km grid of the observation data for the species transmitted to the SINP. These data have been subjected to validation filters.
Distribution map from the Atlas of Departmental Biodiversity and Marine Sectors program
Current distribution in metropolitan France
The map presents a reference distribution layer of the species at the scale of departments and marine sectors. The presence and absence data were established by expertise within a network of partners. This reference distribution is used in the validation process of the SINP data at the INPN level.
Distribution map from the Atlas of Departmental Biodiversity and Marine Sectors program
Certain presence
Corresponds to a report on the basis of at least one observation proved within a period of 10 years (20 years for little-known invertebrates) preceding the year and no presumption of extinction since obtaining the last data nor doubt on reproductive and implemented nature of this population. For migratory species, the presence indicated concerns areas of reproduction.
Probable presence
This status is based on one or more of the following criteria:
search of species incomplete but presence of supportive environments;
ecology of the species consistent with the hypothesis of his presence;
the last reliable sighting is older than 10 years compared to the reference date, no recent specific research and no presumption of extinction from that date [vertebrates, invertebrates and plants well studied (rhopalocera, grasshoppers, dragonflies ...)] ;
the last reliable observation being older than 20 years, no recent specific research and no presumption of extinction from that date [poorly known taxa: fungus, many invertebrates...].
Probable or certain absence
This point covers the absence, more difficult by nature to demonstrate than presence. This status is based on one or more of the following criteria:
intensive but unsuccessful targeted research;
lack of adequate environments;
unobserved species while its presence is easily detected;
unlikely presence for historical or biogeographical reasons.
This status must be assigned to a department in which the presence of the species is casual.
Absence due to a proven extinction
Particular case of absence due to a proven extinction less than a half century ago (older disappearances are treated as "no probable or definite").
No information
In the state of knowledge, we can not comment on the presence or absence in the current department. This is the default status when not comprised in one of the previous categories or whenever there is doubt.
French Version
