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Seothyra
''Seothyra'', commonly known as the buck-spoor spiders, is a psammophilous, burrowing genus of araneomorph spiders in the family Eresidae. The 13 species are endemic to the arid, sandy flats and semistabilized red dunes of southern Africa. They are sexually dimorphic. The tiny males, which are seldom seen,〔(【引用サイトリンク】url=http://www.tirasberge.de/nature/bio/fauna/invertebrates/spiders/index.php )〕 imitate sugar ants or velvet ants in their appearance and habits,〔 while the females hide in and hunt from their characteristic burrows. They are thermophilous,〔 with males as well as females being most active on hot days.〔
==Range and density==
They occur in Namibia, Botswana and South Africa.〔 In South Africa they are present in northern Limpopo, and the Northern Cape as far south as the Tankwa Karoo. Their distribution is patchy, but when forming conspecific aggregations, their webs may even touch one another.〔 Such clusters may contain thousands of females, with a density of 50 m-2, or locally, 100 to 200 m-2.〔 Fossilized sheet webs which closely resemble the modern ones were found in Miocene eolianites of the southern Namib desert, and were dated to some 16 million years ago.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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