Idiosoma formosum

{{Short description|Species of spider}}

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|image = Idiosoma formosum (10.3897-zookeys.756.24397) Figures 145–154.jpg

|image_caption = Male holotype

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| genus = Idiosoma

| species = formosum

| authority = Rix & Harvey, 2018{{cite journal |last1=Rix|first1=MG |last2=Huey |first2=JA |last3=Cooper |first3=SJB |last4=Austin |first4=AD |last5=Harvey |first5=MS |date=2018 |title= Conservation systematics of the shield-backed trapdoor spiders of the nigrum-group (Mygalomorphae, Idiopidae, Idiosoma): integrative taxonomy reveals a diverse and threatened fauna from south-western Australia|url=https://zookeys.pensoft.net/article/24397/ |journal= ZooKeys|issue= 756|pages=1–121 [35] |doi=10.3897/zookeys.756.24397 |access-date=2023-09-05|doi-access=free |pmid=29773959 |pmc=5956031 |bibcode=2018ZooK..756....1R }}

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Idiosoma formosum is a species of mygalomorph spider in the Idiopidae family. It is endemic to Australia. It was described in 2018 by Australian arachnologists Michael Rix and Mark Harvey. The specific epithet formosum comes from Latin formosus (‘beautiful’), in reference to the ornate colouration of the abdomen.{{cite web |url= https://biodiversity.org.au/afd/taxa/55521a81-bce8-495e-ac7f-c42c933387e3|title=Species Idiosoma formosum Rix & Harvey, 2018|author= |date=2023-02-03|website= Australian Faunal Directory |publisher=Dept of Climate Change, Energy, the Environment and Water, Australia |access-date= 2023-09-05}}