| Hyocrinida | |
|---|---|
 | |
| Hyocrinus sp. | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| Order: | Hyocrinida [1] |
| Synonyms [1] | |
Hyocrinina | |
Hyocrinida is an order of sea lilies which contains a single extant family, Hyocrinidae. [1]
| Hyocrinida | |
|---|---|
| | |
| Hyocrinus sp. | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| Order: | Hyocrinida [1] |
| Synonyms [1] | |
Hyocrinina | |
Hyocrinida is an order of sea lilies which contains a single extant family, Hyocrinidae. [1]
Members of this order have long slender stems consisting of a large number of identical columnar units. There are no cirri, and the basal disc of the stem attaches directly to the substrate. The calyx is globular or conical, and consists of five widely-spaced, undivided arms attached to five radial ossicles. [2]
Most hyocrinids are found at depths below 700 m (2,300 ft), in the range 400 to 6,300 m (1,300 to 20,700 ft), in all the ocean basins and on seamounts. [2]
Crinoids are marine animals that make up the class Crinoidea. Crinoids that are attached to the sea bottom by a stalk in their adult form are commonly called sea lilies, while the unstalked forms, called feather stars or comatulids, are members of the largest crinoid order, Comatulida. Crinoids are echinoderms in the phylum Echinodermata, which also includes the starfish, brittle stars, sea urchins and sea cucumbers. They live in both shallow water and in depths as great as 9,000 meters (30,000 ft).
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