After years of expeditions to Brazilian mountains, scientists recorded seven new species of petite frogs.

Scientists unveiled the latest additions to the Brachycephalus frog group of 21 species, which now totals 28, according to the study reported in PeerJ.

All of the frogs are less than 1 centimenter (about 0.3 inches) long and vary in coloration and skin roughness. They have fewer digits than most frogs, too, clocking in at two fingers and three toes compared to a frog's typical four fingers and five toes.

The genus' diversity may be quite underestimated: The first time the species was documented was 1824, but more than half have been named in the last 15 years.

Luiz Fernando Ribeiro / CC BY SA / Via eurekalert.org