| 1. | This genus is characterized by a high density of siliceous spicules.
|
| 2. | It has no calcareous spicules, but it has integumental concrements.
|
| 3. | The skeletons include spicules or consists of a horny external cuticle.
|
| 4. | The spicules are composed of 3 perpendicular rays giving them 6 points.
|
| 5. | The sclerocytes produce spicules via formation of a cellular triad.
|
| 6. | In pairs, the sclerocytes secrete the minerals which create the spicules.
|
| 7. | Some equatorial regions of upwelling, where nutrients are abundant and spicules.
|
| 8. | Siliceous spicules come in two sizes called megascleres and microscleres.
|
| 9. | In ontogeny the first spicules to be secreted are diactines.
|
| 10. | Amoeboid sperm crawl along the spicule into the female worm.
|
मोबाइल