# Smallest living organism with a brain

**URL:** <https://boards.straightdope.com/t/smallest-living-organism-with-a-brain/311037>\
**Category:** Factual Questions\
**Created:** [July 4, 2005, 5:43pm UTC](https://boards.straightdope.com/t/smallest-living-organism-with-a-brain/311037 "2005-07-04T17:43:23Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![scr4](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@scr4](https://boards.straightdope.com/u/scr4)\
**Post date:** [July 7, 2005, 5:44pm UTC](https://boards.straightdope.com/t/smallest-living-organism-with-a-brain/311037/21 "2005-07-07T17:44:01Z")

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How small are the smallest nematodes, exactly? Are they smaller than the smallest mites?

Also, are we talking about the size of the organism at the time it first develops a central nervous system, or size of the fully grown organism?

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