Animal mesoderm forms by enterocoelic pouching, through invagination of the endoderm. The main deuterostome phyla are the Echinodermata and the Chordata. Echinoderms are exclusively marine and include starfish, sea urchins, and sea cucumbers. The chordates are dominated by the vertebrates (animals with backbones), which consist of fishes, amphibians, reptiles, birds, and mammals. The deuterostomes also include the Hemichordata (acorn worms). The Ecdysozoa are protostomes, named after their shared trait of ecdysis, growth by moulting. They include the largest animal phylum, the Arthropoda, which contains insects, spiders, crabs, and their kin. All of these have a body divided into repeating segments, typically
Phyla-Vell the three heroes and Annihilus as survivors. Ultimately in the battle, Phyla manages to steal away the quantum bands that Annihilus took from Quasar, weakening him and allowing Nova to finally bring an end to the Annihilation Wave. She is then seen re-united with Moondragon, and deciding it's up to her to become the new Quasar. Phyla had her own mini-series as the new Quasar, stating July through October 2007, called " – Quasar". The series was written by Christos Gage (who wrote "Union Jack"), penciled by Mike Lilly. Phyla is finding it hard to follow the footsteps of the