| gptkbp:instanceOf | gptkb:class 
 | 
                        
                            
                                | gptkbp:class | gptkb:lake 
 | 
                        
                            
                                | gptkbp:commonName | gptkb:Sand_dollars gptkb:Sea_urchins
 
 | 
                        
                            
                                | gptkbp:defenseMechanism | Spines Toxins (in some species)
 
 | 
                        
                            
                                | gptkbp:diet | Omnivorous 
 | 
                        
                            
                                | gptkbp:distribution | Worldwide oceans 
 | 
                        
                            
                                | gptkbp:economicImportance | Aquarium trade Fisheries
 
 | 
                        
                            
                                | gptkbp:firstAppearance | gptkb:Ordovician_period 
 | 
                        
                            
                                | gptkbp:fossil | Extensive 
 | 
                        
                            
                                | gptkbp:habitat | Marine 
 | 
                        
                            
                                | gptkbp:kingdom | gptkb:Animalia 
 | 
                        
                            
                                | gptkbp:larvalStage | gptkb:Pluteus_larva 
 | 
                        
                            
                                | gptkbp:lifespan | Up to 30 years 
 | 
                        
                            
                                | gptkbp:motility | Slow-moving 
 | 
                        
                            
                                | gptkbp:notableFeature | gptkb:Aristotle's_lantern Spines
 Tube feet
 
 | 
                        
                            
                                | gptkbp:notableSpecies | gptkb:Paracentrotus_lividus gptkb:Strongylocentrotus_purpuratus
 gptkb:Clypeaster_rosaceus
 gptkb:Dendraster_excentricus
 gptkb:Echinus_esculentus
 
 | 
                        
                            
                                | gptkbp:order | gptkb:Cidaroida gptkb:Clypeasteroida
 gptkb:Diadematoida
 gptkb:Echinoida
 gptkb:Spatangoida
 Arbacioida
 Holasteroida
 Temnopleuroida
 
 | 
                        
                            
                                | gptkbp:phylum | gptkb:Echinodermata 
 | 
                        
                            
                                | gptkbp:predators | gptkb:Humans gptkb:fish
 gptkb:Sea_otters
 gptkb:Starfish
 
 | 
                        
                            
                                | gptkbp:reproduction | Sexual 
 | 
                        
                            
                                | gptkbp:respiration | Tube feet Peristomial gills
 
 | 
                        
                            
                                | gptkbp:scientificName | gptkb:lake 
 | 
                        
                            
                                | gptkbp:shape | Radial symmetry Pentaradial symmetry
 
 | 
                        
                            
                                | gptkbp:skeletonType | Calcareous endoskeleton 
 | 
                        
                            
                                | gptkbp:studiedBy | Developmental biology 
 | 
                        
                            
                                | gptkbp:subfamily | gptkb:Echinozoa 
 | 
                        
                            
                                | gptkbp:bfsParent | gptkb:Lower_Jurassic 
 | 
                        
                            
                                | gptkbp:bfsLayer | 8 
 | 
                        
                            
                                | https://www.w3.org/2000/01/rdf-schema#label | Echinoids 
 |