Rhaesus

Rhaesus

*Rhaesus* Motschulsky, 1875 is a monotypic genus of large, robust Prioninae longhorn beetles, represented in Europe by the single species *R. serricollis*, one of the continent's rarest and most imperilled cerambycids. Adults are nocturnal, flying in summer (June–August) in lowland riparian forests of the Danube basin, where ancient willows and poplars still stand. The larvae develop deep within the heartwood of old *Salix* and *Populus* trees over three to four years, requiring veteran trees that are increasingly scarce. The genus is listed under the EU Habitats Directive Annex II, reflecting its critically threatened status.

Seasonal activity

Flight season: Summer–Autumn

Green = active months · Orange = peak

Host plants

Primary hosts: poplar

External resources

GBIF · Wikidata · Käfer der Welt

Field tip: Jeden z nejvzácnějších EU kozlíčků! V starých vrbách/topolech Podunají. EU Habitats II. Noční.