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The velvet spiders (family Eresidae) are a small group (about 100 species in 9 genera〔) of almost totally Old World spiders (exception: a few species are known from Brazil). The characteristics of this family of spiders are that they are entelegyne (have a genital plate in the female), eight-eyed araneomorph spiders that build unkempt webs. They are cribellate (use woolly silk). Some species are nearly eusocial, lacking only a specialized caste system and a queen. They cooperate in brood rearing, unlike almost most other spiders except for some African agelenid spiders in the genus ''Agelena'' and a few others. Female velvet spiders exhibit a remarkable type maternal care unique among arachnids. Upon the birth of her brood, the mother spider liquefies her internal organs and regurgitates this material as food. Once her capability to liquefy her insides is exhausted, the young sense this and consume the mother.〔Rachel Nuwer, Scientific American, October 2015.〕 The genus ''Penestomus'' was previously placed in Eresidae as the subfamily Penestominae, but was elevated to its own family, Penestomidae, in 2010. ==Genera== , the World Spider Catalog accepted the following genera: * ''Adonea'' Simon, 1873 — Mediterranean * ''Dorceus'' C. L. Koch, 1846 — Africa * ''Dresserus'' Simon, 1876 — Africa * ''Eresus'' Walckenaer, 1805 — Palearctic to Morocco * ''Gandanameno'' Lehtinen, 1967 — Africa * ''Loureedia'' Miller et al., 2012 - Israel * ''Paradonea'' Lawrence, 1968 — Africa * ''Seothyra'' Purcell, 1903 — Africa * ''Stegodyphus'' Simon, 1873 — Africa, Madagascar, Brazil, Eurasia 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Velvet spider」の詳細全文を読む スポンサード リンク
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