Myriazoa
| Myriazoa | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Clade: | Myriazoa Schultz et al., 2023 |
| Clades | |
|
sister: Ctenophora | |
The Myriazoa are a proposed basal clade of animals consisting of the Porifera and ParaHoxozoa as sister of the Ctenophora. The phylogeny is based on irreversible changes in synteny in the ancestral Myriazoa.[1] The competing hypothesis is the Eumetazoa/Diploblast clade with Porifera as basal animals. Placozoa are not basal Animals, but appear sister to Cnidaria in ParaHoxozoa, or are basal ParaHoxozoa.
Since the Porifera do not have neurons and muscles (which is also absent in Placozoa), neurons and/or muscles either emerged twice, or there was a secondary loss in Porifera.
References
- ^ Schultz, Darrin T.; Haddock, Steven H. D.; Bredeson, Jessen V.; Green, Richard E.; Simakov, Oleg; Rokhsar, Daniel S. (2023-05-17). "Ancient gene linkages support ctenophores as sister to other animals". Nature. doi:10.1038/s41586-023-05936-6. ISSN 0028-0836.