Anomalocaris canadensis, an apex predator half a billion years ago, liked its food tender.
. Some researchers had suggested that it could have preyed upon another iconic Cambrian critter — the trilobite. Over the years, scads of fossilized injured trilobites have been unearthed, suggesting something had attacked them.
But paleobiologist Russell Bicknell of the American Museum of Natural History in New York City had reservations. Trilobite exoskeletons were hard and thick, and no one had yet presented evidence thatSo Bicknell and colleagues compared the flexible appendages to those of some modern arthropods and tested the primitive appendages’ toughness, range of motion and optimal swimming position via computer simulations.
The findings also imply that even the earliest predators may have been specialized hunters, says evolutionary biologist Joanna Wolfe of Harvard University, who was not involved in the study. “These were complicated ecosystems, even though they’re really ancient.”
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