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35: 211: 252: 170: 281: 245: 238: 34: 276: 271: 188: 138: 183: 175: 226: 8: 115: 86: 29: 127: 222: 161: 265: 218: 111: 76: 66: 46: 132: 155: 56: 210: 263: 246: 253: 239: 264: 137: 136: 205: 13: 14: 293: 209: 33: 1: 121: 282:Prehistoric echinoderm stubs 225:. You can help Knowledge by 16:Extinct order of sea urchins 7: 10: 298: 204: 145: 110:were an order of extinct 30:Scientific classification 28: 23: 221:-related article is a 184:Paleobiology Database 116:Perischoechinoidea 87:Perischoechinoidea 234: 233: 217:This prehistoric 199: 198: 139:Taxon identifiers 105: 104: 24:Echinocystitoida 289: 277:Echinoidea stubs 272:Echinocystitoida 255: 248: 241: 213: 206: 192: 191: 179: 178: 166: 165: 164: 147:Echinocystitoida 134: 133: 114:in the subclass 108:Echinocystitoida 100:Echinocystitoida 98: 38: 37: 21: 20: 297: 296: 292: 291: 290: 288: 287: 286: 262: 261: 260: 259: 202: 200: 195: 187: 182: 174: 169: 160: 159: 154: 141: 124: 96: 32: 17: 12: 11: 5: 295: 285: 284: 279: 274: 258: 257: 250: 243: 235: 232: 231: 214: 197: 196: 194: 193: 180: 167: 151: 149: 143: 142: 131: 130: 123: 120: 103: 102: 94: 90: 89: 84: 80: 79: 74: 70: 69: 64: 60: 59: 54: 50: 49: 44: 40: 39: 26: 25: 15: 9: 6: 4: 3: 2: 294: 283: 280: 278: 275: 273: 270: 269: 267: 256: 251: 249: 244: 242: 237: 236: 230: 228: 224: 220: 215: 212: 208: 207: 203: 190: 185: 181: 177: 172: 168: 163: 157: 153: 152: 150: 148: 144: 140: 135: 129: 126: 125: 119: 117: 113: 109: 101: 95: 92: 91: 88: 85: 82: 81: 78: 75: 72: 71: 68: 67:Echinodermata 65: 62: 61: 58: 55: 52: 51: 48: 45: 42: 41: 36: 31: 27: 22: 19: 227:expanding it 216: 201: 146: 107: 106: 99: 18: 128:Answers.com 266:Categories 219:echinoidea 122:References 112:sea urchin 83:Subclass: 77:Echinoidea 53:Kingdom: 47:Eukaryota 162:Q5332473 156:Wikidata 63:Phylum: 57:Animalia 43:Domain: 93:Order: 73:Class: 189:32738 176:10725 171:IRMNG 223:stub 268:: 186:: 173:: 158:: 118:. 254:e 247:t 240:v 229:. 97:†