First records of the introduced African carder bee, Pseudoanthidium (Immanthidium) repetitum (Hymenoptera : Megachilidae), in Western Australia.

Globalisation has increased the occurrence of species being introduced outside of their natural range. The African carder bee, Pseudoanthidium (Immanthidium) repetitum (Hymenoptera: Megachilidae), is one such species. P. repetititum was first recorded in Australia in 2000 in Queensland (north-east Australia), and rapidly spread down the east coast of Australia, and by 2015 was reported to be a common component of bee assemblages in urban community gardens in Victoria (southern Australia). Here, I report the first occurrences of this species in Western Australia, on the other side of the continent, representing a major expansion of the distribution of the species. Thus far there are three confirmed and one unconfirmed localities where this species has been seen, all localised to the Mandurah region in residential areas of Western Australia. Female specimens were collected from a garden in Halls Head, where it was observed to be abundant. Other bees, both native and the introduced European honeybee, were foraging alongside it. The occurrence of P. repetitum represents a major expansion in its distribution. It remains rare and localised; however, given known negative impacts of introduced species on native fauna and flora, especially in Australia, vigilance is required to monitor this species. The African carder bee, Pseudoanthidium (Immanthidium) repetitum (Hymenoptera: Megachilidae), is an introduced species in Australia. It was first reported in 2000 and rapidly spread across the east coast. This paper reports the first observations of P. repetitum on the other side of the continent in Western Australia, representing a major range expansion. Potential impacts on native fauna and flora of this species are discussed. [ABSTRACT FROM AUTHOR]