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
HMS Starfish (1916) "Starfish" had transferred to the Gunnery School at the Nore, and in March was supporting the torpedo school at the Nore, while by November she had transferred to the Nore Local Defence Flotilla. On 21 April 1928, "Starfish" was sold for scrap to Alloa of Charlestown. HMS Starfish (1916) HMS "Starfish" was an destroyer which served with the Royal Navy. She was launched on 27 September 1916 and sold to be broken up on 21 April 1928. She was built by Hawthorn Leslie of Hebburn Tyne. "Starfish" was one of ten destroyers ordered by the British Admiralty in December 1915