Cambrian Explosion: Trilobites as predators (Introduction)

by David Turell , Sunday, March 13, 2016, 15:17 (3177 days ago) @ David Turell

New research has found strong evidence of the methods Trilobites used to hunt for prey:-https://www.sciencedaily.com/releases/2016/02/160217140323.htm-"The Cambrian Period, which occurred between 541 million and 485 million years ago, is an important point in evolutionary history where most of the major groups of animals first appear in the fossil record. Often called the "Cambrian explosion," fossils from this time provide glimpses into evolutionary history as the world's ecosystems were rapidly diversifying.....fossils from southeast Missouri are helping scientists unlock clues about the behaviors of these predators and their interactions with their prey. Evidence shows that these ancient organisms were behaviorally sophisticated, tailoring their attacks for effectiveness.-"Using sophisticated three-dimensional laser scanning and digital photograph analyses, sections of the rocks revealed burrows or trails left behind by trilobites and their prey -- often worm-like creatures -- in ocean sediments. To the scientists, these intersecting trails show how the predators caught their prey. Additionally, previous studies by former MU geology professor, James Stitt, revealed that the trilobites had very large eyes, so the researchers were looking for clues as to how their anatomy played into their feeding habits.-"Tracks from the site showed that the predators attacked from above, moving alongside to use their many legs for more effective grappling of their prey. Further, predators preferentially selected smaller prey, indicating that they attacked their food rather than randomly bumping into it.-"'Predation, or the action of attacking one's prey, is a significant factor in evolution; this discovery is extremely important in the study of how organisms evolved in the Cambrian Period," Schiffbauer said. "In this study, we provide evidence that these trilobites were likely visual predators, displaying selectivity in seeking and hunting their food."-"'Because we had an abundance of samples from the site, we were able to conduct more rigorous statistical analyses" Huntley said. "Our findings are important not only because of the large sample size, but because these early arthropods displayed such sophisticated predatory behavior.'"-Comment: Trilobites have bifocal mineral lenses in their eyes to fight the distortion of seeing under water. This is sophistication of living design without precursors. Darwin cannot explain this.