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''Cyclocosmia'' or "trapdoor spider" is a genus of spiders in the Ctenizidae family. The abdomen of spiders in this genus is abruptly truncated and ends in a hardened disc which is strengthened by a system of ribs and grooves. They use this to clog the entrance of their 7 to 15 cm deep vertical burrows when threatened,〔Zhu ''et al.'' 2006〕 a phenomenon called phragmosis. Strong spines are located around the edge of the disc. The four spinnerets are found just anterior to it, with the posterior, retractable spinnerets particularly large. ''C. ricketti'' females are 28 mm long, with a disc diameter of 16 mm. Only the bottom portion of the burrow is silk lined.〔Murphy & Murphy 2000〕 The species in this genus are distinguished from each other by the pattern of the abdominal disc, the number of hairs on its seam, and the shape of the spermathecae. == Species == * ''Cyclocosmia lannaensis'' Schwendinger, 2005 — China, Thailand * ''Cyclocosmia latusicosta'' Zhu, Zhang & Zhang, 2006 — China * ''Cyclocosmia loricata'' (C. L. Koch, 1842) — Mexico, Guatemala * ''Cyclocosmia ricketti'' (Pocock, 1901) — China * ''Cyclocosmia siamensis'' Schwendinger, 2005 — Thailand * ''Cyclocosmia torreya'' Gertsch & Platnick, 1975 — USA * ''Cyclocosmia truncata'' (Hentz, 1841) — USA 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「Cyclocosmia」の詳細全文を読む スポンサード リンク
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