Toxeus magnus

Toxeus magnus is a species of jumping spider of the genus Toxeus. It is endemic to Taiwan and Southeast Asia. The species was originally classified as a part of the genus Myrmarachne in 1933 by Saitō in his work Notes on the spiders from Formosa, but it was later reclassified as Toxeus by the Polish arachnologist Jerzy Prószyński in November 2016. The species is notable for being a non-mammalian animal that nurses its offspring through a form of lactation.

Toxeus magnus is exceptional because of its social behaviour. Of the nearly 48,000 known different species of spiders only around 120 are known to be able to tolerate the company of others (including their own siblings) for more than three weeks, and only around 30 species of spiders are known to engage in life-long social lives.