New data on the occurrence of Steatoda triangulosa (Walckenaer, 1802) (Araneae: Theridiidae) in Poland

Steatoda triangulosa (Walckenaer, 1802) is a spider species known from most areas of the Palaearctic, and has also been introduced to North America. In the southern part of its range, this spider species lives in natural habitats, while in regions with a colder climate, e.g. Western and Central Europe, it is usually found in synanthropic conditions. The first records of S. triangulosa were made in Poland at the beginning of the 21st century and probably represent single, accidentally introduced specimens. This paper presents information on recent observations and new localities that now indicate that S. triangulosa is a well-established synanthropic species in Poland.