Ctenopyga Ashmead, 1906 Acanthostichus is a predatory and predominantly subterranean genus of ant in the subfamily Dorylinae.

[2][3] They are found in the New World, from the southern United States to Uruguay, Paraguay and northern Argentina.

[4] They are probably common, but due to their subterranean nature, they are seldom collected or seen.

Many are known only from a few collections, or even single specimen, which makes it hard to determine variability within species.

For this reason, many described members of this genus may be synonyms.