Apomastus schlingeri (misnomer Aptostichus schlingeri) is a species of venomous spiders belonging to a family of trapdoor spiders.

[1] Both known species of the genus are found in the United States.

[2] Apomastus schlingeri have a venom that is highly neurotoxic in effect.

The neurotoxin is actually a complex of proteins called aptotoxins (Aps for short), which in turn belong to a group of neurotoxins called cyrtautoxins.

There are at least nine different peptides, and most of them are directly paralytic and lethal to insect larvae.