In a river of southern China, a “slender” creature with “tiny scales” under its skin paused to rest along the gravel riverbed. Its coloring helped it blend in, but not well enough. Nearby scientists ...

Researchers soon realized they’d discovered a new species: Homatula gelao, or the Gelao loach. Several views of a Homatula gelao, or Gelao loach fish. Photos from Xiao, Guo, Cao, Lin ...