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# A Brazilian sinkhole yielded two previously undescribed aquatic beetles
- URL: https://intelligence.wildlandseco.com/2026-10-24-brazil-karst-sinkhole-two-riffle-beetles/
- Published: 2026-10-24T13:37:39.000Z
- Updated: 2026-10-24T13:37:39.000Z
- Description: Yearlong sampling of a single karst pool broadened the known habitats of riffle beetles.
- Author: Benjamin Worlund
- Tags: Lagoa Misteriosa, biodiversity, karst sinkhole lake and aquatic macrophytes, Wildlife, Water, #ecological-intelligence, #brief-2026-10-24, #global-radar, #geo-latin-america-caribbean

Evidence

Peer-reviewed taxonomic field study

Geography

Lagoa Misteriosa, Mato Grosso do Sul, Brazil

System

Karst sinkhole lake and aquatic macrophytes

## WHAT THE EVIDENCE SAYS

Researchers described Microcylloepus dimorphus and Hexacylloepus misteriosa from adults and larvae sampled from macrophytes in Lagoa Misteriosa. These represent the first Brazilian riffle-beetle species described from a still-water habitat.

## WHY IT MATTERS / OUR READ

Surveying unusual, apparently isolated microhabitats can change species-range and habitat assumptions even in well-studied taxonomic families.

## CAVEATS / UNCERTAINTY

One sinkhole and one year of targeted collection; taxonomic discovery does not quantify regional abundance or endangerment.

## SOURCE

Neotropical Entomology — Polizei et al. (2026)  
[View original evidence ↗](https://doi.org/10.1007/s13744-026-01441-3?ref=intelligence.wildlandseco.com)

From the Morning Brief · 2026-10-24

[Read the full Morning Brief →](https://intelligence.wildlandseco.com/morning-brief-2026-10-24/)