Chelifer ischnochelus is a species of pseudoscorpion, commonly known as a book scorpion. It is a small arachnid, measuring around 2-3 millimeters in length. It is characterized by its elongated body, two large pincers, and a segmented tail-like structure called a pedipalp. Chelifer ischnochelus is typically found in leaf litter and soil, where it preys on small insects and mites.