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
Fiery spiny mouse the skin quite easily. Unlike other species in the genus, the fiery spiny mouse does not lose its bare, scaled tail as easily. The fiery spiny mouse varies in color from a deep brown to a reddish mixed with some black on its back while the belly is white. The dorsal surface color has also been described as being orange in color. It has medium-sized ears and black eyes. The fiery spiny mouse is found in Northeastern Tanzania, near the Usambara Mountains and in Southern Kenya. It has a strictly confined habitat, occupying primarily rocky habitats in dry savannas in