Biologie sous-marine
Les Echinides 800 espèces
Etymologie
- Echinide
- Echine: l'épine
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-echinides2-200x150.jpg)
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-oursin-200x150.jpg)
Oursin régulier (Symétrie radiaire)
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-oursin2-200x150.jpg)
Oursin Irrégulier (Symétrie bilatérale)
Anatomie
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-oursin3-200x134.jpg)
Détails anatomiques
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-piquant-200x149.jpg)
Des piquants
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-podia-200x164.jpg)
Des podias
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-pedicellaire-200x141.jpg)
Des pédicellaires
Système défensif
La lanterne d'aristote
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-lanterne-200x198.jpg)
Nutrition
Les Réguliers
- herbivores
- Mais aussi des bryozoaires, hydraires à l’occasion
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-nutr9-200x150.jpg)
Les Irréguliers
- Micro-organismes vivant dans les sédiments meubles
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-irregu-200x150.jpg)
Et parfois nécrophages …
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-necro-200x135.jpg)
La reproduction
La larve pélagique des oursins
= Echinopluteus
(2 ans pour faire un adulte)
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-larve2-200x281.jpg)
Des animaux qui craignent la lumière
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-bonnet-200x132.jpg)
Tripneutes gratilla, oursin bonnet de prêtre
![](/images/thumbnails/images/remote/http--www.paradise-plongee.com-images-stories-BioEchino-cuir-200x131.jpg)
Asthenosoma varium, oursin cuir venimeux