Nearctic-introduction

Guides

• Bledius gallicus

  Bledius gallicus is a rove beetle in the family Staphylinidae, first described by Gravenhorst in 1806 under the name Oxytelus gallicum. The species has a broad native distribution across Europe, Russia, the Caucasus, Middle East, Central Asia, Mongolia, and China. It has been introduced to eastern North America, with established populations in Canada and the northeastern United States. The genus Bledius comprises species often associated with sandy or muddy habitats, though specific ecological details for B. gallicus remain limited in published sources.

  rove-beetleStaphylinidaeintroduced-speciesPalearcticNearctic-introduction

• Callisto denticulella

  Garden Apple Slender

  Callisto denticulella is a small leaf-mining moth in the family Gracillariidae. Adults are active from May to June and have a wingspan of approximately 11 mm. The species is notable for its distinctive wing pattern featuring white triangular striae on a brown forewing. Larvae are specialized miners of Malus leaves, with additional records from Crataegus, Cotoneaster, and Pyrus. The species has a broad distribution across Europe, eastern North America, and parts of Russia.

  leaf-minerorchard-pestRosaceae-feederPalearcticNearctic-introduction

• Helophorus grandis

  Helophorus grandis is a species of water scavenger beetle in the family Helophoridae. It has a broad geographic distribution spanning Africa, Europe, Northern Asia (excluding China), and North America. The species has been introduced to parts of Canada and the United States. It is an aquatic beetle inhabiting standing water habitats.

  aquatic-beetlewater-scavenger-beetleintroduced-speciesColeopteraHelophoridaePalearcticNearctic-introduction

• Philonthus concinnus

  Philonthus concinnus is a rove beetle in the family Staphylinidae, first described by Gravenhorst in 1802. The genus Philonthus is a large and diverse group of predatory rove beetles, though specific ecological details for P. concinnus remain poorly documented in available sources. The species has a broad distribution spanning Europe, North Africa, the Middle East, Central Asia, and parts of East Asia, and has been introduced to North America where it is now established in Canada and the United States. Like other members of its genus, it is presumed to be predatory, but direct observations of its biology are sparse.

  Staphylinidaerove-beetleColeopterapredatory-beetleintroduced-speciesPalearcticNearctic-introduction

• Quedius molochinus

  Quedius molochinus is a large, robust rove beetle in the subgenus Quedius sensu stricto. It is one of the most widespread species in its genus across the Palearctic region. The species has been introduced to eastern Canada, likely through historical ship ballast transport. Recent molecular studies have revealed unexpected cryptic diversity within this morphologically uniform species.

  Staphylinidaerove-beetleintroduced-speciescryptic-speciesship-ballast-dispersalHolarcticPalearcticNearctic-introductionCOI-barcode-polymorphismQuedius-molochinus-group

• Stenarella domator

  Stenarella domator is a western Palaearctic ichneumonid wasp recently introduced to the Nearctic region. It belongs to the subtribe Osprynchotina within the subfamily Cryptinae. The species is an ectoparasitoid that targets aculeate Hymenoptera nesting in mud or earth substrates. Its establishment in North America represents a notable range expansion for this parasitoid lineage.

  ectoparasitoidadventiveichneumonidaecryptinaepalaearctic-originnearctic-introductionaculeate-parasitoidmud-nest-parasite

• Thyraylia nana

  Birch Conch

  Thyraylia nana is a small tortricid moth commonly known as the Birch Conch. First described by Haworth in 1811, this species occurs across Europe, extends into the Amur Oblast of Russia, and has been recorded in Nova Scotia, Canada. The species is associated with birch host plants, reflecting its common name.

  LepidopteraTortricidaeBirchEuropePalearcticNearctic-introductionsmall-mothleafroller-mothCochylini