Morphological differences on the carapace of hypogean and epigean species of Pseudochthonius: eyes (denoted with red circle), and the narrowing of the posterior region of the carapace (marked with dashed line on the sides of the carapace) A hypogean P. ramalho sp. nov. (male) B epigean P. thibaudi C epigean P. arabicus.

  Part of: Assis L, von Schimonsky DM, Bichuette ME (2021) The first troglobitic Pseudochthonius Balzan, 1892 (Pseudoscorpiones, Chthoniidae) from the karst area of Serra do Ramalho, Brazil: a threatened species. Subterranean Biology 40: 109-128.