Starfish 'arms' are actually extensions of their head, scientists say

The echinoderms more closely resemble disembodied heads than multi-limbed creatures, experts have discoveredStarfish may appear to have a plethora of limbs, but it turns out the creatures actually resemble something akin to a disembodied head.Experts say it has long been a conundrum how starfish, sea urchins and other animals with a fivefold body plan, known as echinoderms, evolved from an ancestor with twofold symmetry - a body plan common today in animals including insects, molluscs and vertebrates. Continue reading...