Remarkable micro-endemism and high congeneric richness: eight new cave-restricted species of Pseudochthonius Balzan, 1892 (Pseudoscorpiones, Chthoniidae) from the Brazilian semi-arid

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  Remarkable micro-endemism and high congeneric richness: eight new cave-restricted species of Pseudochthonius Balzan, 1892 (Pseudoscorpiones, Chthoniidae) from the Brazilian semi-arid Abstract Eight new species of pseudoscorpions belonging to the genus Pseudochthonius Balzan, 1892 are described from the semi-arid region of Brazil. Comprehensive morphological descriptions, diagnostic characters, detailed illustrations, and ecological remarks of the habitats are provided for Pseudochthonius celestialis sp. nov., P. caritas sp. nov., P. patientia sp. nov., P. temperantia sp. nov., P. diligentia sp. nov., P. castitas sp. nov., P. humilitas sp. nov., and P. benignitas sp. nov. In addition, we present a brief discussion of the potential factors underlying the remarkable congeneric species richness observed in this geographically restricted region, as well as the principal threats faced by these species. These findings underscore the importance of conserving caves in order to pr...

Ballistic high-powered spider webs overcome dangerous prey defenses

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Ballistic high-powered spider webs overcome dangerous prey defenses

Summary

Predator–prey interactions are a major selective force shaping kinematic performance, driving the evolution of extreme speed and power in animal movements1. Small animals such as mantis shrimps, trap-jaw ants and slingshot spiders achieve some of the fastest biological movements to capture prey by using latch-mediated spring actuation mechanisms that produce power outputs several orders of magnitude greater than muscle alone2,3,4. These known power-amplified systems are actively controlled by the predator and act on non-specific prey. Here, we report a unique spring-actuated snare in the Australian ballista spider Propostira sp. that is selectively triggered by the defensive behavior of a specific prey — the green tree ant, Oecophylla smaragdina. We argue that the prey specialization of the ballista spider has driven the evolution of exceptional snare performance.



Narendra, A., Joshi, P., Liprandi, D., Anderson, G. J., & Wolff, J. O. (2026). Ballistic high-powered spider webs overcome dangerous prey defenses. Current Biology, 36(12), R691-R692. https://doi.org/10.1016/j.cub.2026.04.066