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Cette grande libellule se reconnait par son thorax vert métallique marqué de bandes antéhumérales et latérales jaunes et son abdomen noirâtre avec des
taches jaunes médiodorsales. Elle peut se confondre avec les Cordulegaster.
Elle est endémique au sud de la France et à la péninsule Ibérique et y est localisée, rare et peu abondante.
On la rencontre sur les rivières aux eaux calmes et chaudes aux berges boisées, mais elle peut aussi coloniser des réservoirs à niveau d’eau variable et
dépourvus de végétation, à des altitudes inférieurs à 500 m.
Malgré sa taille, elle ne s’observe pas facilement. Odonate infatigable, au vol puissant, on l’observe rarement posé, suspendu à la verticale. En matinée,
les adultes, présents de fin mai à mi-août (pic de mi-juin à mi-juillet), sont dans les clairières et les lisières ensoleillées et abritées du vent. Ils
chassent le long des lisières forestières et au-dessus des prairies.
Les larves, bien reconnaissables à leurs pattes immenses, se tiennent à proximité des rives entre 30 et 150 m de profondeur, à des endroits calmes et
ombragés.
La pollution et les aménagements des cours d’eau ainsi que le déboisement, la rectification des berges et l’exploitation des granulats peuvent anéantir les
populations.
[D’après Dijkstra K.-D.B., 2007. Guide des Libellules de France et d’Europe. Delachaux et Niestlé SA, Paris, 320 pages.
Grand D., Boudot J.-P., 2006.
Les Libellules de France, Belgique et Luxembourg
. Biotope, Mèze, (Collection Parthénope), 480 pages.]
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.