899:
321:
124:
153:
329:
912:
415:"One of Evolution's Oddest Creatures Finds a Fossilized Family Member - Opabinia, which swam the seas of Earth's Cambrian era some 500 million years ago, was not just a one hit wonder"
624:
Walcott, Charles D. (13 March 1912). "Cambrian geology and paleontology II: No. 6.—Middle
Cambrian Branchiopoda, Malacostraca, Trilobita, and Merostomata".
992:
317:. Opabiniids also distinguishable from radiodonts by setal blades covering at least part of the body flaps and serrated caudal rami.
372:
prompted laughter when it was first revealed at a paleontological conference. In 2022, more opabiniids were discovered. That being
979:
1033:
898:
696:
637:
Whittington, H. B. (26 June 1975). "The enigmatic animal
Opabinia regalis, Middle Cambrian, Burgess Shale, British Columbia".
396:
is sometimes suggested to be an opabiniid, but morphological features supporting this interpretation are controversial.
581:
Pates, Stephen; Wolfe, Joanna M.; Lerosey-Aubril, Rudy; Daley, Allison C.; Ortega-Hernández, Javier (9 February 2022).
530:
152:
689:
342:
320:
17:
414:
364:
was restudied in the 1970s, and reinterpreted as a stranger animal. Stephen Jay Gould referred to
932:
1038:
1010:
997:
970:
915:
682:
482:
Briggs, D. E. G.; Nedin, C. (1997). "The
Taphonomy and Affinities of the Problematic Fossil
646:
8:
882:
650:
639:
Philosophical
Transactions of the Royal Society of London. Series B, Biological Sciences
662:
607:
582:
558:
511:
503:
419:
147:
1005:
612:
550:
546:
515:
43:
562:
955:
654:
602:
594:
542:
495:
357:
278:
123:
803:
39:
583:"New opabiniid diversifies the weirdest wonders of the euarthropod stem group"
499:
1027:
763:
729:
554:
393:
81:
328:
826:
812:
785:
749:
705:
658:
616:
598:
441:
439:
437:
197:
964:
860:
771:
380:
353:
301:
252:
56:
434:
984:
871:
738:
735:
666:
507:
350:
310:
282:
101:
66:
723:
388:
314:
262:
184:
164:
106:
50:
926:
949:
853:
846:
778:
374:
297:
291:
242:
232:
138:
132:
96:
91:
76:
71:
61:
819:
111:
86:
531:"Anatomy and relationships of the Early Cambrian worm Myoscolex"
717:
674:
174:
792:
580:
445:
286:
486:
from the Lower
Cambrian Emu Bay Shale of South Australia".
313:, but their frontal appendages were basally fused into a
587:
Proceedings of the Royal
Society B: Biological Sciences
463:
258:
248:
238:
228:
451:
349:. Walcott interpreted Opabiniidae as a family of
1025:
690:
368:as a "weird wonder", and an illustration of
636:
481:
469:
406:
697:
683:
122:
606:
475:
412:
327:
319:
623:
457:
14:
1026:
931:
930:
678:
626:Smithsonian Miscellaneous Collections
528:
345:in 1912, alongside its type species
336:
24:
413:Tamisiea, Jack (8 February 2022).
27:Extinct family of basal arthropods
25:
1050:
911:
910:
897:
704:
547:10.1111/j.1463-6409.2004.00136.x
151:
54:
1034:Prehistoric arthropod families
573:
522:
13:
1:
399:
7:
10:
1055:
356:, most closely related to
285:. Its type and best-known
939:
906:
895:
870:
836:
802:
758:
747:
712:
500:10.1017/S0022336000038919
343:Charles Doolittle Walcott
341:Opabiniidae was named by
225:
220:
148:Scientific classification
146:
130:
121:
34:
488:Journal of Paleontology
659:10.1098/rstb.1975.0033
599:10.1098/rspb.2021.2093
333:
325:
331:
323:
529:Dzik, Jerzy (2004).
651:1975RSPTB.271....1W
295:. It also contains
420:The New York Times
334:
326:
1021:
1020:
1006:Open Tree of Life
933:Taxon identifiers
924:
923:
893:
892:
535:Zoologica Scripta
446:Pates et al. 2022
309:closely resemble
272:
271:
216:
44:Middle Ordovician
16:(Redirected from
1046:
1014:
1013:
1001:
1000:
988:
987:
975:
974:
973:
960:
959:
958:
928:
927:
914:
913:
901:
756:
755:
699:
692:
685:
676:
675:
670:
633:
620:
610:
567:
566:
526:
520:
519:
479:
473:
470:Whittington 1975
467:
461:
455:
449:
443:
432:
431:
429:
427:
410:
358:Thamnocephalidae
337:History of study
260:
250:
240:
230:
214:
209:
196:
156:
155:
126:
116:
53:
38:Temporal range:
32:
31:
21:
1054:
1053:
1049:
1048:
1047:
1045:
1044:
1043:
1024:
1023:
1022:
1017:
1009:
1004:
996:
991:
983:
978:
969:
968:
963:
954:
953:
948:
935:
925:
920:
902:
889:
866:
832:
804:Kerygmachelidae
798:
752:
743:
708:
703:
673:
576:
571:
570:
527:
523:
480:
476:
468:
464:
456:
452:
444:
435:
425:
423:
411:
407:
402:
339:
332:Size comparison
281:of marine stem-
213:
207:
194:
150:
117:
115:
114:
109:
104:
99:
94:
89:
84:
79:
74:
69:
64:
59:
48:
47:
40:Middle Cambrian
36:
28:
23:
22:
15:
12:
11:
5:
1052:
1042:
1041:
1036:
1019:
1018:
1016:
1015:
1002:
989:
976:
961:
945:
943:
937:
936:
922:
921:
919:
918:
907:
904:
903:
896:
894:
891:
890:
888:
887:
886:
885:
876:
874:
868:
867:
865:
864:
857:
850:
842:
840:
834:
833:
831:
830:
823:
816:
808:
806:
800:
799:
797:
796:
789:
782:
775:
767:
759:
753:
748:
745:
744:
742:
741:
732:
726:
720:
713:
710:
709:
702:
701:
694:
687:
679:
672:
671:
634:
621:
577:
575:
572:
569:
568:
521:
474:
462:
450:
433:
404:
403:
401:
398:
338:
335:
277:is an extinct
270:
269:
268:
267:
256:
246:
236:
223:
222:
218:
217:
205:
201:
200:
192:
188:
187:
182:
178:
177:
172:
168:
167:
162:
158:
157:
144:
143:
128:
127:
119:
118:
110:
105:
100:
95:
90:
85:
80:
75:
70:
65:
60:
55:
37:
26:
9:
6:
4:
3:
2:
1051:
1040:
1037:
1035:
1032:
1031:
1029:
1012:
1007:
1003:
999:
994:
990:
986:
981:
977:
972:
966:
962:
957:
951:
947:
946:
944:
942:
938:
934:
929:
917:
909:
908:
905:
900:
884:
880:
879:
878:
877:
875:
873:
869:
863:
862:
858:
856:
855:
851:
849:
848:
844:
843:
841:
839:
835:
829:
828:
824:
822:
821:
817:
815:
814:
810:
809:
807:
805:
801:
795:
794:
790:
788:
787:
783:
781:
780:
776:
774:
773:
768:
766:
765:
764:Caryosyntrips
761:
760:
757:
754:
751:
746:
740:
737:
733:
731:
730:Panarthropoda
727:
725:
722:Superphylum:
721:
719:
715:
714:
711:
707:
700:
695:
693:
688:
686:
681:
680:
677:
668:
664:
660:
656:
652:
648:
645:(910): 1–43.
644:
640:
635:
631:
627:
622:
618:
614:
609:
604:
600:
596:
592:
588:
584:
579:
578:
564:
560:
556:
552:
548:
544:
540:
536:
532:
525:
517:
513:
509:
505:
501:
497:
493:
489:
485:
478:
471:
466:
459:
454:
447:
442:
440:
438:
422:
421:
416:
409:
405:
397:
395:
394:Emu Bay Shale
391:
390:
385:
383:
382:
377:
376:
371:
367:
363:
359:
355:
352:
348:
344:
330:
324:Cross section
322:
318:
316:
312:
308:
304:
303:
299:
294:
293:
288:
284:
280:
276:
265:
264:
257:
255:
254:
247:
245:
244:
237:
235:
234:
227:
226:
224:
219:
215:Walcott, 1912
212:
206:
203:
202:
199:
193:
190:
189:
186:
183:
180:
179:
176:
173:
170:
169:
166:
163:
160:
159:
154:
149:
145:
141:
140:
135:
134:
129:
125:
120:
113:
108:
103:
98:
93:
88:
83:
78:
73:
68:
63:
58:
52:
49:507–475
45:
41:
33:
30:
19:
1039:Dinocaridida
940:
859:
852:
845:
837:
827:Mobulavermis
825:
818:
813:Kerygmachela
811:
791:
786:Pambdelurion
784:
777:
770:
762:
750:Dinocaridida
706:Dinocaridida
642:
638:
629:
625:
590:
586:
541:(1): 57–69.
538:
534:
524:
494:(1): 22–32.
491:
487:
483:
477:
465:
458:Walcott 1912
453:
424:. Retrieved
418:
408:
387:
386:
379:
373:
369:
365:
361:
346:
340:
306:
296:
290:
274:
273:
261:
251:
241:
231:
210:
198:Dinocaridida
137:
131:
29:
971:Opabiniidae
965:Wikispecies
941:Opabiniidae
861:Mieridduryn
838:Opabiniidae
772:Parvibellus
574:Works cited
426:10 February
381:Mieridduryn
354:crustaceans
302:Mieridduryn
275:Opabiniidae
253:Mieridduryn
211:Opabiniidae
35:Opabiniidae
1028:Categories
956:Q110903763
883:Radiodonta
872:Radiodonta
739:Arthropoda
736:Stem-group
400:References
351:anostracan
311:radiodonts
307:Opabiniids
283:arthropods
185:Arthropoda
136:(top) and
724:Ecdysozoa
716:Kingdom:
555:1463-6409
516:131851540
484:Myoscolex
389:Myoscolex
315:proboscis
263:Myoscolex
171:Kingdom:
165:Eukaryota
142:(bottom)
950:Wikidata
916:Category
854:Utaurora
847:Opabinia
779:Omnidens
734:Phylum:
718:Animalia
617:35135344
593:(1968).
563:85216629
375:Utaurora
370:Opabinia
366:Opabinia
362:Opabinia
347:Opabinia
298:Utaurora
292:Opabinia
243:Utaurora
233:Opabinia
204:Family:
181:Phylum:
175:Animalia
161:Domain:
139:Utaurora
133:Opabinia
18:Opabinid
1011:4708900
985:4666706
820:Utahnax
728:Clade:
667:2417412
647:Bibcode
608:8826304
508:1306537
221:Genera
191:Class:
998:101394
665:
615:
605:
561:
553:
514:
506:
378:, and
300:, and
279:family
993:IRMNG
793:Youti
663:JSTOR
559:S2CID
512:S2CID
504:JSTOR
392:from
287:genus
980:GBIF
881:see
632:(6).
613:PMID
551:ISSN
428:2022
57:PreꞒ
655:doi
643:271
603:PMC
595:doi
591:289
543:doi
496:doi
289:is
1030::
1008::
995::
982::
967::
952::
661:.
653:.
641:.
630:57
628:.
611:.
601:.
589:.
585:.
557:.
549:.
539:33
537:.
533:.
510:.
502:.
492:71
490:.
436:^
417:.
384:.
360:.
305:.
107:Pg
51:Ma
46:,
42:-
769:?
698:e
691:t
684:v
669:.
657::
649::
619:.
597::
565:.
545::
518:.
498::
472:.
460:.
448:.
430:.
266:?
259:†
249:†
239:†
229:†
208:†
195:†
112:N
102:K
97:J
92:T
87:P
82:C
77:D
72:S
67:O
62:Ꞓ
20:)
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