5, see text Chthonos is a genus of South American ray spiders that was created by Jonathan A. Coddington in 1986 because the previous name was preoccupied.

[2] Originally placed with the Orb-weaver_spiders under the name Tecmessa,[3] it was transferred to the ray spiders in 1986.

[2] As of June 2020[update] it contains five species, found in Peru, Brazil, and Ecuador:[1] Formerly included:

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