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An echinoderm (/ɪˈkaɪnəˌdɜːrm, ˈɛkə-/) is any animal of the phylum Echinodermata (/ɪˌkaɪnoʊˈdɜːrmətə/), which includes starfish, brittle stars, sea urchins, sand dollars and sea cucumbers, as well as the sessile sea lilies or "stone lilies". While bilaterally symmetrical as larvae, as adults echinoderms are recognisable by their usually five-pointed…
Applications, Anatomy and physiology & Mode of life
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echinoderms sea starfish species arms tube feet stars urchins cucumbers brittle body system larvae crinoids may often many water food
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Ophiothela danae | instance of | six-armed species | 0.80 | text |
| Ophiactis savignyi | instance of | six-armed species | 0.80 | text |
| Ophionotus hexactis exist | instance of | six-armed species | 0.80 | text |
| and Ophiacantha vivipara often has more than six.Echinoderms have secondary radial symmetry in portions of their body at some stage of life | instance of | six-armed species | 0.80 | text |
| most likely an adaptation to a sessile or slow-moving existence | instance of | six-armed species | 0.80 | text |
| Labidiaster annulatus possess up to fifty arms | instance of | starfish | 0.80 | text |
| while the sea-lily Comaster schlegelii has two hundred.Genetic studies have shown that genes directing anterior-most development are expressed along ambulacra in the center of starfish rays | instance of | starfish | 0.80 | text |
| with the next-most-anterior genes expressed in the surrounding fringe of tube feet | instance of | starfish | 0.80 | text |
| molluscs | instance of | Some other species are able to ingest whole food items | 0.80 | text |
| Pelagothuria are pelagic | instance of | Some holothuroid adults | 0.80 | text |
| barnacles restricted the extent of the behaviour | instance of | before competition from organisms | 0.80 | text |
| Echinoderm | related to Anatomy and physiology | Echinoderms | 0.60 | section |
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