Seven New Teeny Tiny Mini-Frogs Discovered in Brazil – Some are the Smallest Ever

KS Nature

These newly discovered mini-frogs are so small they barely fit on your fingernail – but, they do come in some flashy colors!

BrachycephalusĀ (Anura: Brachycephalidae) is a remarkable genus of miniaturized frogs that call theĀ Brazilian Atlantic Rainforest home. The firstĀ BrachycephalusĀ species was foundĀ in 1824, but most of the species have been discovered over the past 15 years.

The seven new species live on seven distinct mountaintops in south eastern Brazil. Their habitats are known as ‘cloud forests.’ Each species is cut off from one another due to dips and valleys with varying climates that act as environmental barriers.

Brachycephalus areĀ a group of frogs known for their bright colors and miniscule sizeĀ – some are theĀ smallest terrestrial vertebrates on record (less than 1cm). Their tiny frog anatomy has shrunk to their size, but one thing has changed. These amphibiansĀ typically have three toes and two fingers, instead of the five toes and four fingers found in most frogs.

Their skin is what sets them apart. They vary in color and texture; some are rough and bumpy, while others are quite smooth. Their bright colors alert predators to the poisonous toxins in their skin.Ā Those with brighter colors often reflectĀ higher levels of the deadly chemical tetrodotoxin.

The severeĀ isolation experienced by these frogs has produced 21 known species ofĀ BrachycephalusĀ – and a new study has pushed that count to 28.

Brachycephalus comes in a variety of bright colors IMAGE: MARCIO R. PIE, CC BY SA
Brachycephalus comes in a variety of bright colors IMAGE: MARCIO R. PIE, CC BY SA

Marcio Pie, a professor at the Universidade Federal do ParanĆ” in Brazil, led researchersĀ into the remote misty rainforest inĀ search ofĀ these tiny critters. Following extensive fieldwork, treacherous hikes, and hours of sifting through dirt and leaves, they found a surprising seven new species ofĀ Brachycephalus!

Marcio Pie’sĀ findings were published June 4 in theĀ journalĀ PeerJ.

Seven New Teeny Tiny Mini-Frogs Discovered in Brazil – Some are the Smallest Ever