arm spines and other subtle physical features, the study said. DNA analysis found the new species had at least 3% genetic divergence from related brittle stars. “Despite being recorded since ...

They’re after brittle stars—marine animals with long, slender, serpent-like arms—to peek into ... 7 “The brittle star can regenerate the arm in just a month, which is very, very fast,” said Parey. In ...

But only the trained brittle stars learned to associate darkness with food. Early in the 10-month-long experiment, the animals stayed hidden when the lights went out. But over time, the animals made ...