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
Northern spiny-tailed gecko northern spiny-tailed gecko. A large amount of this species' habitat has been lost or heavily degraded by land clearing and feral invasive species including goats. Habitat degradation and loss should not be considered a major threat at this time due to the wide distribution and a large amount of suitable habitat that remains. Northern spiny-tailed gecko The northern spiny-tailed gecko ("Strophurus ciliaris") is a species of lizard in the family Diplodactylidae which is endemic to Australia. The meaning of the scientific name or binomial, "Strophurus ciliaris", comes from "strophurus" meaning "turning-tail" and "ciliaris" meaning "eyelashed", referring to the spines above