126:
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108:
749:
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725:. The University of Kansas Paleontological Contributions: Paper 109. Paleontological Institute, University of Kansas. pp. 1–60.
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722:
Cambrian
Agnostida of North America and Greenland: Part I: Ptychagnostidae
794:
719:
Richard A. Robison (1984). "Cambrian trilobites of east-central Alaska".
494:
385:
339:
335:
307:
80:
75:
60:
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45:
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34:
30:
347:
343:
169:
771:
452:
842:
775:
784:
338:that are more or less uniform in size and shape (
8:
772:
431:. The family was first established by the
124:
106:
20:
314:). The family includes several important
410:Ptychagnostidae is classified under the
392:). The earliest member of the family is
660:
700:. A Guide to the Orders of Trilobites
691:
689:
666:
664:
7:
346:is composed of two body segments (
14:
441:in 1939. Its name comes from the
759:
747:
146:
350:). They are completely blind.
1:
933:Miaolingian first appearances
451:. It includes the following
16:Extinct family of trilobites
959:
362:. They existed during the
354:Distribution and age range
395:Ptychagnostus praecurrens
360:cosmopolitan distribution
272:
267:
254:
247:
143:Scientific classification
141:
132:
123:
114:
105:
23:
938:Miaolingian extinctions
674:. Paleobiology Database
499:Hawle & Corda, 1847
698:"Agnostida Fact Sheet"
358:Ptychagnostidae has a
330:, ptychagnostids have
890:Paleobiology Database
135:Ptychagnostus cuyanus
768:at Wikimedia Commons
117:Ptychagnostus gibbus
918:Cambrian trilobites
696:Samuel M. Gon III.
400:Burgess Shale fauna
928:Trilobite families
457:taxonomic synonyms
905:
904:
877:Open Tree of Life
778:Taxon identifiers
764:Media related to
672:"Ptychagnostidae"
650:
640:
630:
620:
608:
566:
556:
555:Pokrovskaya, 1958
544:
534:
524:
512:
500:
490:
480:
470:
439:Teiichi Kobayashi
390:million years ago
312:million years ago
279:
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752:Data related to
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551:Pseudophalacroma
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27:Temporal range:
21:
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816:Ptychagnostidae
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786:Ptychagnostidae
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766:Ptychagnostidae
754:Ptychagnostidae
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282:Ptychagnostidae
263:
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235:Ptychagnostidae
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29:
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24:Ptychagnostidae
17:
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756:at Wikispecies
743:
742:External links
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711:
685:
659:
658:
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649:Özdikmen, 2009
641:
631:
621:
615:Schismagnostus
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632:
627:
626:
625:Tomagnostella
622:
619:Robison, 1994
617:
616:
612:
611:
607:
603:
602:Canotagnostus
599:
595:
591:
587:
583:
582:Solenagnostus
579:
578:Huarpagnostus
575:
574:Triplagnostus
570:
569:
563:
562:
561:Ptychagnostus
558:
553:
552:
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531:
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477:
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448:Ptychagnostus
444:
440:
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430:
427:
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397:
396:
391:
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384:Epoch in the
383:
380:of the early
379:
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369:
365:
361:
353:
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337:
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329:
321:
319:
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316:index fossils
313:
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258:
257:Ptychagnostus
253:
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236:
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226:
223:
217:
215:Superfamily:
214:
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36:
32:
22:
19:
785:
721:
714:
702:. Retrieved
676:. Retrieved
643:
639:Howell, 1935
633:
623:
613:
606:Zeteagnostus
605:
601:
597:
593:
589:
586:Pentagnostus
585:
581:
577:
573:
565:Jaekel, 1909
559:
549:
542:Agnostonymus
541:
529:Onymagnostus
527:
519:Myrmecomimus
517:
509:
493:
489:Howell, 1935
485:Goniagnostus
483:
473:
465:Allobodochus
463:
455:(with their
446:
409:
393:
388:(509 to 497
357:
325:
310:(509 to 497
281:
280:
273:
262:Jaekel, 1909
255:
234:
133:
115:
18:
923:Agnostoidea
810:Wikispecies
704:18 November
678:18 November
635:Tomagnostus
594:Aotagnostus
415:Agnostoidea
412:superfamily
322:Description
222:Agnostoidea
912:Categories
655:References
590:Aristarius
533:Opik, 1979
523:Opik, 1979
510:Miagnostus
479:Opik, 1979
469:Opik, 1979
443:type genus
293:trilobites
249:Type genus
180:Arthropoda
731:0075-5052
645:Yakutiana
475:Criotypus
429:Agnostida
422:Agnostina
398:from the
382:Furongian
364:5th Stage
340:isopygous
332:cephalons
328:agnostids
326:Like all
297:5th Stage
295:from the
274:See text
240:Kobayashi
209:Agnostida
195: (?)
193:Trilobita
166:Kingdom:
160:Eukaryota
801:Q1241316
795:Wikidata
598:Acidusus
495:Lejopyge
433:Japanese
419:suborder
406:Taxonomy
386:Cambrian
368:Series 3
308:Cambrian
290:agnostid
228:Family:
176:Phylum:
170:Animalia
156:Domain:
943:Paibian
882:4707244
856:4639507
843:4319802
417:of the
375:Paibian
373:to the
366:of the
348:somites
342:). The
336:pygidia
306:of the
301:Paibian
299:to the
268:Genera
202:Order:
186:Class:
35:Paibian
31:Wuliuan
869:116371
729:
453:genera
344:thorax
286:family
242:, 1939
895:85401
864:IRMNG
830:6275Z
426:order
371:Epoch
284:is a
851:GBIF
727:ISSN
706:2012
680:2012
334:and
41:PreꞒ
838:EoL
825:CoL
459:):
378:Age
304:Age
288:of
914::
892::
879::
866::
853::
840::
827::
812::
797::
688:^
663:^
604:,
600:,
596:,
592:,
588:,
584:,
580:,
576:,
540:=
445:,
424:,
402:.
318:.
91:Pg
33:-
733:.
708:.
682:.
572:=
507:=
232:†
219:†
206:†
190:†
96:N
86:K
81:J
76:T
71:P
66:C
61:D
56:S
51:O
46:Ꞓ
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