Sunday, November 9, 2025

[Arachnida • 2025] Pseudotyrannochthonius rucapillanElusive, Rare, or simply Underexplored? A New Species of Pseudotyrannochthonius Beier, 1930 (Pseudoscorpiones: Pseudotyrannochthoniidae) from a Chilean Lava Tube


Pseudotyrannochthonius rucapillan 
 Prado & Ferreira, 2025
 

 Abstract  
A new pseudoscorpion species, Pseudotyrannochthonius rucapillan sp. nov., from a lava tube cave in Chile, is described. This species exhibits distinct characteristics that differ from other congeneric species, including variations in chelal and cheliceral dentition and measurements. In addition, we provide ecological remarks on the new species, possible threats, and a key to Pseudotyrannochthonius species in Chile.

KEYWORDS: cave dwelling, South America, taxonomy

Type locality and habitat of Pseudotyrannochthonius rucapillan sp. nov.
A Villa Rica volcanic landscape; B main cave entrance sur-roundings;
C live male holotype; D Villa Rica cave interior, showing altered interior. 

Pseudotyrannochthonius rucapillan sp. nov.

Etymology: Named after the type location Villarrica Volcano, referred to as Rucapillán in the Mapuche local language. The name should be treated as a noun in apposition.


Guilherme C. Prado and Rodrigo L. Ferreira. 2025. Elusive, Rare, or simply Underexplored? A New Species of Pseudotyrannochthonius Beier, 1930 (Pseudoscorpiones: Pseudotyrannochthoniidae) from a Chilean Lava Tube. Arachnology. 20(2); 317-322. DOI: doi.org/10.13156/arac.2025.20.2.317 (7 July 2025)