[{"n": "Echinoidea", "u": "/e/sea-urchins/echinoidea/", "s": "Spiny, globular echinoderms found in all oceans and depths."}, {"n": "Cidaroidea (subclass)", "u": "/e/sea-urchins/cidaroidea-subclass/", "s": "Primitive sea urchins with widely separated primary spines."}, {"n": "Fossil echinoids", "u": "/e/sea-urchins/fossil-echinoids/", "s": "Fossilised sea urchins with a rich cultural and geological history."}, {"n": "Irregularia", "u": "/e/sea-urchins/irregularia/", "s": "Irregularia are sea urchins with bilateral symmetry and irregular tests."}, {"n": "Neognathostomata", "u": "/e/sea-urchins/neognathostomata/", "s": "A superorder of irregular sea urchins including sand dollars."}, {"n": "Clypeasteroida", "u": "/e/sea-urchins/sand-dollar/", "s": "Flat, burrowing sea urchins with a coin-like test."}, {"n": "Sea urchin injury", "u": "/e/sea-urchins/sea-urchin-injury/", "s": "Puncture wounds from brittle spines cause pain and inflammation."}, {"n": "Sea urchin skeletogenesis", "u": "/e/sea-urchins/sea-urchin-skeletogenesis/", "s": "Larval skeleton formation in the sea urchin, critical yet transient."}, {"n": "Sea urchins of the Gulf of California", "u": "/e/sea-urchins/sea-urchins-of-the-gulf-of-california/", "s": "Sea urchins of the Gulf of California, a biodiverse region."}, {"n": "Test (biology)", "u": "/e/sea-urchins/test-biology/", "s": "Hard shell of sea urchins and foraminiferans, made of calcium carbonate."}, {"n": "Aspidodiadema", "u": "/e/sea-urchins/aspidodiadema/", "s": "A genus of sea urchins with slender whorled spines."}, {"n": "Coelopleurus", "u": "/e/sea-urchins/coelopleurus/", "s": "Brightly colored abyssal sea urchins with fossil records from the Eocene."}, {"n": "Diadema (echinoderm)", "u": "/e/sea-urchins/diadema-echinoderm/", "s": "A widespread, ecologically important genus of tropical sea urchins."}, {"n": "Echinocyamus", "u": "/e/sea-urchins/echinocyamus/", "s": "A genus of echinoderms with almost cosmopolitan distribution."}, {"n": "Echinolampas", "u": "/e/sea-urchins/echinolampas/", "s": "A cosmopolitan genus of echinoderms in the family Echinolampadidae."}, {"n": "Echinus (echinoderm)", "u": "/e/sea-urchins/echinus-echinoderm/", "s": "A genus of sea urchins first described by Linnaeus in 1758."}, {"n": "Heliophora", "u": "/e/sea-urchins/heliophora/", "s": "A morphologically variable sand dollar from West African waters."}, {"n": "Hemicentrotus", "u": "/e/sea-urchins/hemicentrotus/", "s": "Monotypic sea urchin genus with a long harvest history."}, {"n": "Heterocentrotus", "u": "/e/sea-urchins/heterocentrotus/", "s": "Brightly colored sea urchins with thick, slate-pencil-like spines."}, {"n": "Lovenia", "u": "/e/sea-urchins/lovenia/", "s": "A genus of sea urchin with fossil and Recent species worldwide."}, {"n": "Loxechinus", "u": "/e/sea-urchins/loxechinus/", "s": "Monotypic genus of sea urchin native to southern South America."}, {"n": "Mespilia", "u": "/e/sea-urchins/mespilia/", "s": "A tropical sea urchin with vibrant blue zones and small spines."}, {"n": "Salmacis (echinoderm)", "u": "/e/sea-urchins/salmacis-echinoderm/", "s": "A genus of Indo-Pacific sea urchins with hemispherical tests and sharp spines."}, {"n": "Spatangus", "u": "/e/sea-urchins/spatangus/", "s": "A genus of heart urchins that graze on subsurface deposits."}, {"n": "Sphaerechinus", "u": "/e/sea-urchins/sphaerechinus/", "s": "The only species in its genus, found in the Mediterranean and eastern Atlantic."}, {"n": "Sterechinus", "u": "/e/sea-urchins/sterechinus/", "s": "A genus of Antarctic sea urchins with a fossil European origin."}, {"n": "Cassiduloida", "u": "/e/sea-urchins/cassiduloida/", "s": "A once-diverse order of sea urchins, now reduced to seven species."}, {"n": "Psychocidaridae", "u": "/e/sea-urchins/psychocidaridae/", "s": "A sea urchin family with one living genus and a Jurassic fossil record."}, {"n": "Dendraster excentricus", "u": "/e/sea-urchins/dendraster-excentricus/", "s": "A burrowing sand dollar with an off-center flower pattern."}, {"n": "Echinothurioida", "u": "/e/sea-urchins/echinothurioida/", "s": "Deepsea sea urchins with flexible tests and hollow spines."}, {"n": "Pelanechinus", "u": "/e/sea-urchins/pelanechinus/", "s": "Extinct Jurassic sea urchin with a flexible, tile-like test."}, {"n": "Phormosoma placenta", "u": "/e/sea-urchins/phormosoma-placenta/", "s": "A deepwater Atlantic sea urchin with a flexible, collapsing test."}, {"n": "Evechinus chloroticus", "u": "/e/sea-urchins/evechinus-chloroticus/", "s": "Endemic New Zealand sea urchin, overabundant due to overfishing and climate change."}, {"n": "Paracentrotus lividus", "u": "/e/sea-urchins/paracentrotus-lividus/", "s": "A purple-spined sea urchin of the Mediterranean and eastern Atlantic."}, {"n": "Psammechinus miliaris", "u": "/e/sea-urchins/psammechinus-miliaris/", "s": "A shallow-water sea urchin with depth-dependent coloration."}, {"n": "Red sea urchin", "u": "/e/sea-urchins/red-sea-urchin/", "s": "A keystone grazer and ecosystem engineer of temperate rocky reefs."}, {"n": "Strongylocentrotus droebachiensis", "u": "/e/sea-urchins/strongylocentrotus-droebachiensis/", "s": "A green sea urchin found in northern oceans worldwide."}, {"n": "Strongylocentrotus purpuratus", "u": "/e/sea-urchins/strongylocentrotus-purpuratus/", "s": "First echinoderm genome sequenced; key kelp forest species."}, {"n": "Holasteroida", "u": "/e/sea-urchins/holasteroida/", "s": "An order of irregular sea urchins with marked bilateral symmetry."}, {"n": "Echinarachnius parma", "u": "/e/sea-urchins/echinarachnius-parma/", "s": "A Northern Hemisphere sand dollar with a purplish brown test."}, {"n": "Echinocyamus pusillus", "u": "/e/sea-urchins/echinocyamus-pusillus/", "s": "A small sand dollar that buries in gravel and turns green when injured."}, {"n": "Mellita quinquiesperforata", "u": "/e/sea-urchins/mellita-quinquiesperforata/", "s": "A tropical sand dollar with nocturnal feeding and righting behavior."}, {"n": "Spatangoida", "u": "/e/sea-urchins/spatangoida/", "s": "Heart urchins are bilaterally symmetrical sea urchins with a distinct heart shape."}, {"n": "Echinocardium cordatum", "u": "/e/sea-urchins/echinocardium-cordatum/", "s": "A heart-shaped urchin that buries in sand worldwide."}, {"n": "Meoma ventricosa", "u": "/e/sea-urchins/meoma-ventricosa/", "s": "A large Caribbean urchin with dual symmetry and burrowing habits."}, {"n": "Glyptocidaridae", "u": "/e/sea-urchins/glyptocidaridae/", "s": "A monotypic sea urchin family with a single living species."}, {"n": "Stomopneustes", "u": "/e/sea-urchins/stomopneustes/", "s": "The sole living species in its family Stomopneustidae."}, {"n": "Eucidaris", "u": "/e/sea-urchins/eucidaris/", "s": "Slate pencil urchins with stout, beaded spines and wide distribution."}, {"n": "Goniocidaris", "u": "/e/sea-urchins/goniocidaris/", "s": "A genus of sea urchins typical of the subfamily Goniocidarinae."}, {"n": "Aspidodiadema jacobyi", "u": "/e/sea-urchins/aspidodiadema-jacobyi/", "s": "A deep-sea urchin studied for its unusual reproductive biology."}, {"n": "Cidaridae", "u": "/e/sea-urchins/cidaridae/", "s": "Basal sea urchin family with stout tests and massive spines."}, {"n": "Cidaris blakei", "u": "/e/sea-urchins/cidaris-blakei/", "s": "A deep-sea urchin with distinctive fan-like spines."}, {"n": "Goniocidaris umbraculum", "u": "/e/sea-urchins/goniocidaris-umbraculum/", "s": "A brooding sea urchin from southern New Zealand waters."}, {"n": "Prionocidaris thomasi", "u": "/e/sea-urchins/prionocidaris-thomasi/", "s": "A fuzzy-spined urchin with maroon secondary spines from the Pacific."}, {"n": "Aporocidaris incerta", "u": "/e/sea-urchins/aporocidaris-incerta/", "s": "Deep-sea Antarctic urchin with a compressed test and dark brown color."}, {"n": "Diadematidae", "u": "/e/sea-urchins/diadematidae/", "s": "Sea urchins with eyes and long, hollow spines."}, {"n": "Astropyga radiata", "u": "/e/sea-urchins/astropyga-radiata/", "s": "A large, venomous Indo-Pacific urchin with blue-spotted bare areas."}, {"n": "Centrostephanus coronatus", "u": "/e/sea-urchins/centrostephanus-coronatus/", "s": "A nocturnal, carnivorous sea urchin with long, sharp spines."}, {"n": "Centrostephanus longispinus", "u": "/e/sea-urchins/centrostephanus-longispinus/", "s": "A sea urchin with long, toxic spines and two Atlantic subspecies."}, {"n": "Echinothrix calamaris", "u": "/e/sea-urchins/echinothrix-calamaris/", "s": "A sea urchin with banded spines and a rudimentary visual system."}, {"n": "Echinothrix diadema", "u": "/e/sea-urchins/echinothrix-diadema/", "s": "Long-spined tropical urchin with blue-black sheen."}, {"n": "Arbacia lixula", "u": "/e/sea-urchins/arbacia-lixula/", "s": "A black sea urchin with uniform spines and an anal valve."}, {"n": "Arbacia nigra", "u": "/e/sea-urchins/arbacia-nigra/", "s": "The most common sea urchin on the coasts of Peru and Chile."}, {"n": "Arbacia punctulata", "u": "/e/sea-urchins/arbacia-punctulata/", "s": "A spherical, dark purple-spined sea urchin used in developmental biology."}, {"n": "Coelopleurus exquisitus", "u": "/e/sea-urchins/coelopleurus-exquisitus/", "s": "Deepwater urchin discovered via eBay, prized for vivid colouration."}]