Collagen IV exists in all metazoan phyla. Molluscs have more varied forms than other invertebrate phyla. Additionally, the phylum Fibrobacteres is indicated to be specifically related to these two phyla. Archaea are further divided into multiple recognized phyla. The deuterostomes include the echinoderms, hemichordates, chordates, and a few smaller phyla. The Archaea are further divided into multiple recognized phyla. The gymnosperms are divided into six phyla. Kingdoms are divided into smaller groups called phyla. This process occurs naturally in at least 67 prokaryotic species (in seven different phyla). The morphological characteristics of MTOCs vary between the different phyla and kingdoms. The animal Kingdom contains some 35 extant phyla. It is one of two phyla of archaea, the other being crenarchaeota. Around 1000 species of bacteria from 19 bacterial phyla have been found. Histological evidence in a large number of species belonging to all major phyla. The main deuterostome phyla are the Echinodermata and the Chordata.