| Ctenella chagius Matthai, 1928 | 
|   | 
| photo by 
	Veron, Charlie (J.E.N.) | 
| Family: | Euphylliidae () | |||
| Max. size: | ||||
| Environment: | reef-associated; marine | |||
| Distribution: | Western Indian Ocean: Mauritius to Chagos. | |||
| Diagnosis: | Colonies are mostly submassive and meandroid and valleys are highly convoluted. May be cream, green or light brown in color. | |||
| Biology: | Found in reef slopes (Ref. 83581). | |||
| IUCN Red List Status: | Critically Endangered (CR); Date assessed: 14 April 2024 (A2bc) Ref. 123251) | |||
| Threat to humans: | ||||
| Country info: |  | |||