Nerve net Nerve net A nerve net consists of interconnected neurons lacking a brain or any form of cephalization. While organisms with bilateral body symmetry are normally associated with a central nervous system, organisms with radial symmetry are associated with nerve nets. Nerve nets can be found in members of the Cnidaria, Ctenophora, and Echinodermata phyla, all of which are found in marine environments. Nerve nets can provide animals with the ability to sense objects through the use of the sensory neurons within the nerve net. The nerve net is the simplest form of a nervous system found in multicellular organisms. Unlike
Bacterial phyla Group A. Two species of the candidate phylum OP10, which is now called Armatimonadetes, where recently cultured: "Armatimonas rosea" isolated from the rhizoplane of a reed in a lake in Japan and "Chthonomonas calidirosea" from an isolate from geothermally heated soil at Hell's Gate, Tikitere, New Zealand. One species, "Caldisericum exile", of the candidate phylum OP5 was cultured, leading to it being named Caldiserica. The candidate phylum VadinBE97 is now known as Lentisphaerae after "Lentisphaera araneosa" and "Victivallis vadensis" were cultured. More recently several candidate phyla have been given provisional names despite the fact that they have no cultured representatives: