Isocrinidae

Isocrinidae is one of four extant families of crinoids in the order Isocrinida.

Metacrinus is a genus of stalked crinoids in the family Isocrinidae. Members of this genus live on hard surfaces in deeper parts of the ocean. The genus has extant species and is also represented in the fossil record. Members of the genus grow to a maximum height of and are found in the eastern Pacific Ocean from Japan to Australia.