Researchers formally describe Helmetia expansa, offering new insights into its anatomy, behavior and evolutionary relationships.

For over a century, scientists have been puzzled by a mysterious fossil called Helmetia expansa, an ancient arthropod from ...

The new study found the characteristics in Helmetia expansa differed from previous studies. It is said that these species had ...

For over a century, the Cambrian arthropod Helmetia expansa remained a mystery. Discovered by paleontologist Charles Doolittle Walcott in 1918, it was ...

"Molting is the period of an arthropod's life when it's most vulnerable," he says. "While its soft shell is exposed, the animal is in danger from predators or, in some cases, even hungry cannibals ...

Filmed in the **Louisiana bayou**, the documentary follows the **life cycle of a crayfish**, from **fertilized egg to adulthood**, showcasing its growth, molting, and survival adaptations.