Kholizah, Siti2022-01-192022-01-192021-07wahyu sari yenihttps://repository.unri.ac.id/handle/123456789/10431Arthropods are the largest group of animal that inhabit the soil taking about 65%. Therefore Arthropods paly an important role in the ecosystem. Spiders have huge diversity because they show adaptability to their environment. The purpose of this study was to determine the diversity of spiders in the residential area of Simpang Baru Pekanbaru and around the Arboretum forest of the Universitas Riau campus. This study identified the pattern of spiders’ preference over environmental factors in the two type areas. The total number of species obtained in this study was 24 species and 139 individuals consisting of eight families. Diversity Index in campus forest and residential areas ranged from 2.7 to 2.9 and 2.0 to 2.2 respectively. In addition, the Evenness Index Value in residential part and campus forest was from 0.77 to 0.95 and from 0.97 to 1.0, respectively.endiversityspiderArachnidaforest arboretum UNRISimpang Baru PekanbaruArticle