351:
1311:
111:
132:
1317:
1322:
1343:
1329:
382:
at the outside and the back. The front and side margin is bordered by a flatted and undecorated zone of almost constant length/width. The area within that band is densely covered in pustules. Two distinctly raised eyes that are circular to oval are located at the outer rim of what could be compared
391:) consists of 11 segments (or possibly sometimes 10 or 12) perpendicular to the midline, that terminate to the sides in small spines that angle to the back. Each segment carries a spine at midline too that is directed backward, a character that distinguishes
289:, in what are now Utah and Wisconsin. It has an inverted egg-shape, with a semi-circular head, 11 abdominal segments and a tail spine. It is a typical member of the group
1423:
304:
was named after Frank
Beckwith, editor and publisher of the Millard County Chronicle of Delta, Utah in the early to middle 1900s, who had a passion for trilobites.
1410:
1487:
1482:
342:, but it has now been established that the defining character (that the terminal segments appeared to be fused) is actually an artifact.
508:
477:
1310:
274:
is an extinct genus of average to large size (5 centimetres or 2.0 inches to 12 centimetres or 4.7 inches), soft bodied
131:
1401:
384:
350:
1321:
501:
439:
1363:
813:
416:
1449:
243:
1316:
1477:
1328:
820:
320:
865:
646:
110:
1286:
893:
844:
1220:
1056:
948:
900:
836:
767:
378:) is semi-circular, with the margin curving smoothly from the front to an acute, but rather small
1346:
1229:
962:
941:
872:
753:
738:
630:
494:
456:
324:
126:
976:
920:
828:
760:
1454:
1045:
886:
690:
1436:
1428:
1257:
983:
969:
955:
1441:
1100:
774:
856:
746:
448:
1003:
806:
639:
286:
1079:
1031:
669:
590:
189:
1471:
1072:
722:
544:
64:
1120:
1024:
911:
731:
1395:
1017:
934:
798:
785:
683:
388:
363:
316:
315:
has been collected from the Middle and Upper
Cambrian of Utah (Weeks Formation,
290:
202:
39:
1386:
1156:
1147:
1136:
1111:
1093:
1086:
1065:
1038:
879:
604:
452:
84:
49:
1275:
1264:
1205:
1198:
1183:
711:
697:
611:
583:
565:
550:
535:
517:
379:
278:
275:
176:
163:
143:
89:
33:
1380:
1250:
1236:
1174:
1129:
927:
704:
653:
618:
282:
101:
79:
74:
59:
54:
44:
1415:
1243:
1163:
597:
460:
375:
94:
69:
529:
371:
153:
1357:
1191:
349:
1361:
490:
370:
is an inverted egg-shape with a stout sword-like tail spine or
387:, with a strongly effaced outline and lobes. The abdomen (or
486:
433:
Stephen P. Hesselbo (1989). "The aglaspidid arthropod
1370:
1274:
1219:
1173:
1146:
1119:
1110:
1055:
1001:
910:
855:
784:
721:
667:
629:
563:
374:. The dorsal shield covering the cephalothorax (or
327:(in North-America called Sunwaptan) of Wisconsin.
478:Description of the Aglaspididae with emphasis on
395:from other Aglaspidid genera. Only one species,
338:was previously placed in a separate family, the
502:
8:
281:that lived during the late Middle and Upper
1358:
1116:
1009:
790:
675:
575:
571:
560:
509:
495:
487:
437:from the Cambrian of Utah and Wisconsin".
428:
426:
109:
20:
408:
121:collected in the Weeks Formation, Utah
7:
482:(in Italian) with many illustrations
14:
1342:
1341:
1327:
1320:
1315:
1309:
130:
1:
1488:Fossil taxa described in 1931
1483:Fossils of the United States
417:"Beckwithia typa Aglaspids"
399:, is currently recognized.
16:Extinct genus of arthropods
1504:
1337:
1307:
1012:
793:
678:
578:
574:
559:
524:
453:10.1017/S0022336000041263
249:
242:
127:Scientific classification
125:
117:
108:
23:
287:paleocontinent Laurentia
440:Journal of Paleontology
1402:Beckwithia (arthropod)
359:
1450:Paleobiology Database
353:
362:The outline of the
360:
1465:
1464:
1437:Open Tree of Life
1364:Taxon identifiers
1355:
1354:
1305:
1304:
1301:
1300:
1297:
1296:
1215:
1214:
997:
996:
993:
992:
663:
662:
331:Taxonomic history
267:
266:
223:
1495:
1458:
1457:
1445:
1444:
1432:
1431:
1419:
1418:
1406:
1405:
1404:
1391:
1390:
1389:
1359:
1345:
1344:
1332:
1331:
1324:
1319:
1313:
1117:
1010:
857:Tremaglaspididae
791:
676:
576:
572:
561:
511:
504:
497:
488:
465:
464:
430:
421:
420:
413:
258:
254:
221:
214:
201:
188:
175:
135:
134:
113:
99:
36:
29:Temporal range:
21:
1503:
1502:
1498:
1497:
1496:
1494:
1493:
1492:
1468:
1467:
1466:
1461:
1453:
1448:
1440:
1435:
1427:
1422:
1414:
1409:
1400:
1399:
1394:
1385:
1384:
1379:
1366:
1356:
1351:
1333:
1326:
1293:
1270:
1211:
1169:
1142:
1106:
1051:
1006:
1004:Trilobitomorpha
989:
906:
851:
821:Chacharejocaris
807:Australaglaspis
780:
717:
672:
659:
640:Acanthomeridion
625:
568:
555:
520:
515:
474:
469:
468:
432:
431:
424:
415:
414:
410:
405:
397:Beckwithia typa
383:to a trilobite
356:Beckwithia typa
348:
333:
323:) and from the
310:
299:
263:
260:
256:Beckwithia typa
252:
251:
238:
220:
212:
199:
186:
173:
129:
119:Beckwithia typa
104:
98:
97:
92:
87:
82:
77:
72:
67:
62:
57:
52:
47:
42:
31:
30:
27:
25:Beckwithia typa
17:
12:
11:
5:
1501:
1499:
1491:
1490:
1485:
1480:
1470:
1469:
1463:
1462:
1460:
1459:
1446:
1433:
1420:
1407:
1392:
1376:
1374:
1368:
1367:
1362:
1353:
1352:
1350:
1349:
1338:
1335:
1334:
1308:
1306:
1303:
1302:
1299:
1298:
1295:
1294:
1292:
1291:
1290:
1289:
1280:
1278:
1272:
1271:
1269:
1268:
1261:
1254:
1247:
1240:
1233:
1225:
1223:
1217:
1216:
1213:
1212:
1210:
1209:
1202:
1195:
1188:
1179:
1177:
1171:
1170:
1168:
1167:
1160:
1152:
1150:
1144:
1143:
1141:
1140:
1133:
1125:
1123:
1114:
1108:
1107:
1105:
1104:
1097:
1090:
1083:
1080:Phytophilaspis
1076:
1069:
1061:
1059:
1053:
1052:
1050:
1049:
1042:
1035:
1032:Pygmaclypeatus
1028:
1021:
1013:
1007:
1002:
999:
998:
995:
994:
991:
990:
988:
987:
980:
973:
966:
959:
952:
945:
938:
931:
924:
916:
914:
908:
907:
905:
904:
897:
890:
883:
876:
869:
866:Brachyaglaspis
861:
859:
853:
852:
850:
849:
841:
833:
825:
817:
810:
803:
794:
788:
782:
781:
779:
778:
771:
764:
757:
750:
743:
735:
727:
725:
719:
718:
716:
715:
708:
701:
694:
687:
679:
673:
670:Vicissicaudata
668:
665:
664:
661:
660:
658:
657:
650:
647:Australimicola
643:
635:
633:
627:
626:
624:
623:
615:
608:
601:
594:
591:Falcatamacaris
587:
579:
569:
564:
557:
556:
554:
553:
547:
538:
532:
525:
522:
521:
516:
514:
513:
506:
499:
491:
485:
484:
473:
472:External links
470:
467:
466:
447:(5): 636β642.
422:
407:
406:
404:
401:
354:A cephalon of
347:
344:
332:
329:
321:Millard County
309:
306:
298:
295:
285:on the former
265:
264:
261:
247:
246:
240:
239:
231:
229:
225:
224:
210:
206:
205:
197:
193:
192:
190:Vicissicaudata
184:
180:
179:
171:
167:
166:
161:
157:
156:
151:
147:
146:
141:
137:
136:
123:
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93:
88:
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73:
68:
63:
58:
53:
48:
43:
38:
37:
28:
15:
13:
10:
9:
6:
4:
3:
2:
1500:
1489:
1486:
1484:
1481:
1479:
1476:
1475:
1473:
1456:
1451:
1447:
1443:
1438:
1434:
1430:
1425:
1421:
1417:
1412:
1408:
1403:
1397:
1393:
1388:
1382:
1378:
1377:
1375:
1373:
1369:
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1360:
1348:
1340:
1339:
1336:
1330:
1325:
1323:
1318:
1312:
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1234:
1232:
1231:
1227:
1226:
1224:
1222:
1218:
1208:
1207:
1203:
1201:
1200:
1196:
1194:
1193:
1189:
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1185:
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1180:
1178:
1176:
1172:
1166:
1165:
1161:
1159:
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1134:
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1131:
1127:
1126:
1124:
1122:
1118:
1115:
1113:
1109:
1103:
1102:
1098:
1096:
1095:
1091:
1089:
1088:
1084:
1082:
1081:
1077:
1075:
1074:
1073:Luohuilinella
1070:
1068:
1067:
1063:
1062:
1060:
1058:
1054:
1048:
1047:
1043:
1041:
1040:
1036:
1034:
1033:
1029:
1027:
1026:
1022:
1020:
1019:
1015:
1014:
1011:
1008:
1005:
1000:
986:
985:
981:
979:
978:
974:
972:
971:
967:
965:
964:
960:
958:
957:
953:
951:
950:
946:
944:
943:
939:
937:
936:
932:
930:
929:
925:
923:
922:
918:
917:
915:
913:
909:
903:
902:
898:
896:
895:
894:Quasimodaspis
891:
889:
888:
884:
882:
881:
877:
875:
874:
870:
868:
867:
863:
862:
860:
858:
854:
847:
846:
845:Rozhkovocaris
842:
839:
838:
834:
831:
830:
826:
823:
822:
818:
816:
815:
811:
809:
808:
804:
801:
800:
796:
795:
792:
789:
787:
783:
777:
776:
772:
770:
769:
765:
763:
762:
758:
756:
755:
751:
749:
748:
744:
741:
740:
736:
734:
733:
729:
728:
726:
724:
723:Cheloniellida
720:
714:
713:
709:
707:
706:
702:
700:
699:
695:
693:
692:
688:
686:
685:
681:
680:
677:
674:
671:
666:
656:
655:
651:
649:
648:
644:
642:
641:
637:
636:
634:
632:
628:
621:
620:
616:
614:
613:
609:
607:
606:
602:
600:
599:
595:
593:
592:
588:
586:
585:
581:
580:
577:
573:
570:
567:
562:
558:
552:
548:
546:
545:Panarthropoda
542:
539:
537:
534:Superphylum:
533:
531:
527:
526:
523:
519:
512:
507:
505:
500:
498:
493:
492:
489:
483:
481:
476:
475:
471:
462:
458:
454:
450:
446:
442:
441:
436:
429:
427:
423:
418:
412:
409:
402:
400:
398:
394:
390:
386:
381:
377:
373:
369:
365:
357:
352:
345:
343:
341:
340:Beckwithiidae
337:
330:
328:
326:
322:
318:
314:
307:
305:
303:
296:
294:
292:
288:
284:
280:
277:
273:
272:
259:
257:
248:
245:
244:Binomial name
241:
237:
236:
230:
227:
226:
219:
218:
211:
208:
207:
204:
198:
195:
194:
191:
185:
182:
181:
178:
172:
169:
168:
165:
162:
159:
158:
155:
152:
149:
148:
145:
142:
139:
138:
133:
128:
124:
120:
116:
112:
107:
103:
100:Middle/Upper
96:
91:
86:
81:
76:
71:
66:
61:
56:
51:
46:
41:
35:
32:502β492
26:
22:
19:
1371:
1314:
1263:
1256:
1249:
1242:
1235:
1228:
1221:Conciliterga
1204:
1197:
1190:
1182:
1162:
1155:
1135:
1128:
1121:Emucarididae
1099:
1092:
1085:
1078:
1071:
1064:
1057:Xandarellida
1044:
1037:
1030:
1025:Kwanyinaspis
1023:
1016:
982:
975:
968:
961:
954:
949:Glypharthrus
947:
940:
933:
926:
919:
912:Aglaspididae
901:Tremaglaspis
899:
892:
885:
878:
871:
864:
843:
837:Obrutschewia
835:
827:
819:
812:
805:
797:
773:
768:Pseudarthron
766:
759:
752:
745:
737:
732:Cheloniellon
730:
710:
703:
696:
689:
682:
652:
645:
638:
617:
610:
603:
596:
589:
582:
540:
479:
444:
438:
434:
411:
396:
392:
367:
361:
355:
339:
335:
334:
312:
311:
308:Distribution
301:
300:
270:
269:
268:
262:Resser, 1931
255:
250:
235:B. typa
234:
233:
222:Resser, 1931
216:
215:
183:(unranked):
170:(unranked):
118:
24:
18:
1478:Aglaspidida
1396:Wikispecies
1230:Haifengella
1018:Arthroaspis
963:Hesselbonia
942:Chraspedops
935:Aglaspoides
873:Chlupacaris
799:Angarocaris
786:Aglaspidida
754:Neostrabops
739:Drabovaspis
684:Emeraldella
631:Protosutura
389:opisthosoma
380:genal spine
364:exoskeleton
346:Description
317:House Range
302:Beckwithia
291:Aglaspidida
203:Aglaspidida
1472:Categories
1372:Beckwithia
1157:Misszhouia
1148:Naraoiidae
1137:Kangacaris
1112:Nektaspida
1094:Xandarella
1087:Sinoburius
1066:Cindarella
1039:Retifacies
977:Tuboculops
921:Aglaspella
880:Cyclopites
829:Girardevia
814:Beckwithia
761:Paraduslia
605:Squamacula
551:Arthropoda
480:Beckwithia
435:Beckwithia
403:References
393:Beckwithia
368:Beckwithia
336:Beckwithia
325:Franconian
313:Beckwithia
279:arthropods
276:artiopodan
271:Beckwithia
217:Beckwithia
164:Arthropoda
1287:Trilobita
1276:Trilobita
1265:Tegopelte
1206:Tariccoia
1199:Soomaspis
1184:Buenaspis
1046:Tonglaiia
887:Flobertia
712:Carimersa
698:Kodymirus
691:Eozetetes
612:Thulaspis
584:Bailongia
566:Artiopoda
536:Ecdysozoa
528:Kingdom:
518:Artiopoda
297:Etymology
228:Species:
177:Artiopoda
150:Kingdom:
144:Eukaryota
1387:Q4878791
1381:Wikidata
1347:Category
1258:Skioldia
1251:Saperion
1237:Helmetia
1175:Liwiidae
1130:Emucaris
984:Uarthrus
970:Setaspis
956:Gogglops
928:Aglaspis
705:Sidneyia
654:Zhiwenia
619:Urokodia
549:Phylum:
530:Animalia
385:glabella
283:Cambrian
160:Phylum:
154:Animalia
140:Domain:
102:Cambrian
1442:5324604
1429:1106343
1416:3267254
1244:Kuamaia
1164:Naraoia
1101:Zhugeia
775:Triopus
598:Molaria
461:1305623
376:prosoma
358:, 25 mm
253:†
232:†
209:Genus:
196:Order:
747:Duslia
459:
372:telson
1455:18897
1424:IRMNG
1192:Liwia
541:Clade
457:JSTOR
1411:GBIF
1285:see
40:Preκ
449:doi
366:of
1474::
1452::
1439::
1426::
1413::
1398::
1383::
543::
455:.
445:63
443:.
425:^
319:,
293:.
90:Pg
34:Ma
1187:?
848:?
840:?
832:?
824:?
802:?
742:?
622:?
510:e
503:t
496:v
463:.
451::
419:.
213:β
200:β
187:β
174:β
95:N
85:K
80:J
75:T
70:P
65:C
60:D
55:S
50:O
45:κ
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