| 21. | It is infesting " Ophiocomina nigra ", the black brittle star, in the Firth of Clyde, Scotland.
|
| 22. | It is a fast-growing brittle star and is not thought to live for more than three years.
|
| 23. | Brittle stars of the genus " Ophiomastix " as well as shelled gastropods are also not attacked.
|
| 24. | Brittle stars are the most agile of the echinoderms, raising their discs and taking strides when moving.
|
| 25. | Sea urchins are close relatives of starfish, crinoids, brittle stars and sea cucumbers, all being echinoderms ('spiny skins').
|
| 26. | The smallest brittle stars found have just two segments per arm and a disc diameter of two millimetres.
|
| 27. | In the Paleozoic era, brittle stars had open ambicular grooves, but in modern forms, these are turned inward.
|
| 28. | In these starfish and brittle stars, direct development without passing through a bilateral larval stage usually takes place.
|
| 29. | This brittle star usually metamorphose into young brittle stars which drift in the plankton for about three weeks before settling.
|
| 30. | This brittle star usually metamorphose into young brittle stars which drift in the plankton for about three weeks before settling.
|
