Idiosoma nigrum

{{Short description|Black rugose trapdoor spider from Australia}}

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| image =Idiosoma nigrum.jpg

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| taxon = Idiosoma nigrum

| authority = Main, 1952

| range_map = Distribution.idiosoma.nigrum.png

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Idiosoma nigrum, also called black rugose trapdoor spider, occurs only in south-western Western Australia, in dry woodlands east of the Darling Scarp and north to Moore River.

Females can reach a length of about 30mm, males about 18mm.{{Cite web|url=https://www.environment.gov.au/cgi-bin/sprat/public/publicspecies.pl?taxon_id=66798|title=Idiosoma nigrum — Shield-backed Trapdoor Spider, Black Rugose Trapdoor Spider|website=Department of Agriculture, Water and the Environment}}

Idiosoma nigrum digs burrows up to 32 cm deep.{{cite web | title = Black Rugose Trapdoor Spider factsheet | url=http://www.amonline.net.au/factsheets/rugose.htm |archiveurl=https://web.archive.org/web/20090508164147/http://www.amonline.net.au/factsheets/rugose.htm|archivedate=2009-05-08|url-status=dead|website=Australian Museum| accessdate = 2006-08-17}}