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Despite the alarming rates of deforestation and forest fragmentation, Madagascar still harbors extraordinary biodiversity. However, in many arthropod groups, such as spiders, this biodiversity remains mostly unexplored and undescribed. The first subsocial Madagascan species of the theridiid spider genus    Anelosimus    were described in 2005 when six new species were found to coexist in the Périnet forest fragment within Andasibe-Mantadia NP. However, this discovery was based only on a few specimens and the extent of this Madagascan radiation has remained unknown. We here report on a thorough survey of &gt;350 colonies from Périnet, and three pilot surveys into additional Madagascar forests (Ambohitantely, Ranamofana, and Montagne d’Ambre). The morphological, molecular and natural history data from these surveys facilitated a revised taxonomy and phylogenetic hypothesis of Madagascan    Anelosimus   . This subsocial clade currently comprises six previously known (   A.   andasibe    Agnarsson &amp; Kuntner, 2005,    A.   may    Agnarsson, 2005,    A.   nazariani    Agnarsson &amp; Kuntner, 2005,    A.   sallee    Agnarsson &amp; Kuntner, 2005,    A.   salutAgnarsson &amp; Kuntner, 2005,    A.   vondrona    Agnarsson &amp; Kuntner, 2005) and 10 new species:    A.   ata    sp. n. ,    A.   buffoni    sp. n. ,    A.   darwini    sp. n. ,    A.   hookeri    sp. n. ,    A.   huxleyi    sp. n. ,    A.   lamarcki    sp. n. ,    A.   moramora    sp. n. ,    A.   tita    sp. n. ,    A.   torfi    sp. n. ,    A.   wallacei    sp. n. . With the exception of    A.   may    and    A.   vondrona   , all other species appear to be single forest endemics. While additional sampling is necessary, these data imply a much higher local richness and endemism in Madagascan forests than in any other comparable area globally. The phylogenetic results establish a sister clade relationship between the subsocial    Anelosimus    in Madagascar and the American ‘ eximius  group’, and between the solitary    A.   decaryi    on Madagascar and a solitary American clade. These findings imply duplicate colonizations from America, an otherwise rare biogeographical pattern, calling for more detailed investigation of    Anelosimus    biogeography.

Systematics of the Madagascar Anelosimus spiders: remarkable local richness and endemism, and dual colonization from the Americas