Reference
Christoph Hörweg, Milan Rezac (2018): Synanthropic is best: Nuctenea umbratica (Araneae: Araneidae) and Steatoda bipunctata (Araneae: Theridiidae) are the European Spiders of the Years 2017 and 2018 – Arachnologische Mitteilungen – 56: 32 - 35.