Neocrepidodera

Members of Neocrepidodera can be distinguished from related flea beetle genera by genitalic characters, particularly the structure of the aedeagus and spermatheca. Specific species-level identification often requires examination of these internal structures. Body size ranges from approximately 3.5–5.5 mm in examined species. Coloration varies from metallic blue-green to orange, rusty red, or brown depending on species.

Species occupy diverse habitats including open grassy areas, fens, saltmarshes, agricultural lands, parks, and gardens. Many Western Palearctic species are associated with medium and high elevation mountain ecosystems. N. ferruginea has been recorded from both wild habitats and cultivated areas in its introduced North American range.

Native distribution centered in the Western Palearctic, with species widespread across Europe (except northern Scandinavia and Iceland for some species), extending to Anatolia, Cyprus, Azerbaijan, and Iran. Some species have narrow endemic ranges, such as N. ligurica in the Western Alps. At least one species (N. ferruginea) has been introduced to North America, with established populations in Ontario and Québec, Canada.

Adults of examined species are active primarily from late June through October; some populations appear as early as April. Adults of N. transversa do not usually survive into winter.

N. ferruginea, the European rusted flea beetle, represents a potential agricultural threat in North America. Adults feed on various grasses including cultivated species such as Alopecurus pratense, Dactylis glomerata, Festuca rubra, and Poa pratensis. Larvae are suspected to develop within roots and central stems of cereals, posing particular concern for cereal production if the species expands into western Canadian agricultural regions.

• CrepidoderaHistorically confused with Neocrepidodera; separated based on genitalic morphology and other structural characters
• Other Alticini generaDistinguished by specific aedeagus and spermatheca structure; external morphology often insufficient for identification

• flea beetle
• Chrysomelidae
• Alticini
• Western Palearctic
• mountain fauna
• invasive species
• agricultural pest

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• First Record of the European Rusted Flea Beetle,Neocrepidodera ferruginea(Scopoli, 1763), in North America (Coleoptera: Chrysomelidae: Galerucinae: Alticini)
• The role of climate and biotic factors in shaping current distributions and potential future shifts of European Neocrepidodera (Coleoptera, Chrysomelidae)
• The genome sequence of a flea beetle, Neocrepidodera transversa (Marsham, 1802).