Trilobites Sexual Dimorphism: The Discover of the Oldest Known Morphological Difference between Male and Female Dating Back to Cambrian

Do you collect trilobite? Or you are one of the researchers study trilobites? They are more than 10000 species of trilobites exist on the earth before, one of the most diverse groups of extinct marine arthropod. Even a single species, they exhibit a series of different variance. And this small variance, revealed a big secret of prehistoric animal, the Sexual Dimorphism! This is about a topic going to discuss over this book, it provides a fossil evidence to show the earlier appearance difference between male and female start not later than Cambrian period, about 521 million years ago!