Crinozoa
Subphylum of marine invertebrates
From Wikipedia, the free encyclopedia
Crinozoa is a subphylum of mostly sessile echinoderms, of which the crinoids, or sea lilies and feather stars, are the only extant members.[1][2] Crinozoans have an extremely extensive fossil history.[citation needed]
Matsumoto 1929
| Crinozoa Temporal range: | |
|---|---|
| |
| Crinoid on the reef of Batu Moncho Island, Indonesia | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Subphylum: | Crinozoa Matsumoto 1929 |
| Classes | |
| |
Classes within Crinozoa
As published in the Treatise on Invertebrate Paleontology, Crinozoa included all stemmed groups except for the few stemmed basal solutes.[3] When Blastozoa was erected to contain stalked forms with brachioles rather than arms, only Crinoidea and Paracrinoidea remained within Crinozoa.[4][5] Recent cladistic work has placed Paracrinoidea under Blastozoa,[6] although some sources continue to include Paracrinoidea.[2]
One proposal for the cladistic placement of the Homalozoan classes groups Stylophora together with crinoids to form Crinozoa.[7] A 2024 survey of recent research finds more support for Homalozoa as a paraphyletic assemblage along the echinoderm stem group, but noted that the position of Stylophora in particular was uncertain.[8]
If neither Paracrinoidea nor Stylophora can be included, Crinozoa would be equivalent to the Crinoidea total group.
See also
- List of echinoderm orders
- Blastoids, superficially similar-appearing echinoderms that belong to a different echinoderm subphylum.
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