After dinosaurs, pterosaurs and marine reptiles vanished off the face of the earth 65 million years ago, the big theme in vertebrate evolution was the rapid progression of mammals from small, timid, mouse-sized creatures to the giant megafauna of the middle to late Cenozoic Era, including oversized wombats, rhinoceroses, camels, and beavers. The defining characteristic of vertebrates is their backbone, an anatomical feature that first appeared in the fossil record about 500 million years ago during the Ordovicianperiod. At first, invertebrates developed tissues from just two embryonic cell layers. Let’s take a closer look at each of these to understand how invertebrates have evolved over time to become the incredible world-dominating animals that they are today. There was an outer cell layer called ectoderm and an inner cell layer called endoderm. It was the first step in the evolution of organs and organ systems. Here are various groups of vertebrates in the order in which they evolved.

We Will Write a Custom Essay Specifically The two cell layers allowed different types of tissues to form.

The three main things that develop as invertebrate animals evolve are symmetry, specialization, and cephalization. The three main things that develop as invertebrate animals evolve are symmetry, specialization, and cephalization.

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