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
Spiny-flanked chameleon gives birth to live young. "Trioceros laterispinis" was first described in 1932 by British herpetologist and biologist Arthur Loveridge as "Chamaeleon laterispinis". It was described under the same name in 1966 by Daan and Hillenius. In 1982, Böhme described it as the "Chamaeleo laterispinis brookesiaeformis", and in 1999, Necas described it as the "Chamaeleo laterispinis". Tilbury and Tolley described it as "Trioceros laterispinis" in 2009. It is commonly also known as the spiny-flanked chameleon. Spiny-flanked chameleon The spiny-flanked chameleon (also known as the spiny-sided chameleon), Trioceros laterispinis, is a species of chameleon endemic to the United Republic of Tanzania, East