286:
46:
163:, suborthochoanitic septal necks, and endosiphuncular rod; in many aspects similar to rod-bearing orthocones of the Ordovician. It is thought by some that Ordovician-Silurian orthocones with continuous longitudinal endosiphuncular laminar deposits constitute a single phylogenetic stock.
213:
Bjorn Kroger, 2008. A new genus of middle
Tremadocian orthoceratoids and the Early Ordovician origin of orthoceratoid cephalopods. Brief Report Acta Palaeontologica Polonica 53 (4): 745–749
210:
A. A. Shevyrev 2004, The
Cephalopod Macrosystem: A Historical Review, the Present State of Knowledge, and Unsolved Problems: 2. Classification of Nautiloid Cephalopods.
379:
179:
738:
548:
428:
167:
243:
784:
799:
236:
789:
216:
804:
794:
221:
45:
229:
779:
291:
756:
285:
706:
751:
743:
8:
446:
40:
345:
191:
175:
171:
159:
Zhuravleva, 1964, a
Silurian orthoconic genus with a wide, nearly central, tubular
145:
587:
570:
493:
100:
729:
650:
554:
503:
498:
460:
773:
358:
351:
182:. The Polymeridae and Rangeroceratidae were proposed by Evans in 2005 for
681:
674:
668:
617:
601:
565:
508:
386:
372:
251:
597:
561:
453:
439:
421:
321:
661:
655:
624:
611:
607:
593:
531:
477:
433:
400:
327:
274:
253:
141:
87:
28:
688:
542:
520:
407:
314:
160:
152:
has a continuous lining or a longitudinal rod-like structure within.
149:
57:
700:
723:
524:
301:
264:
77:
32:
537:
365:
194:
was established by
Kobayashi in 1935 and is based on the genus
67:
155:
198:. The Dissidoceratidae was established by Zhuravleva for
771:
237:
166:The Dissidocerida as understood includes the
244:
230:
517:First appearance of long-lasting lineages
148:orthoceratoid cephalopods in which the
772:
705:
704:
225:
190:Hook and Flower 1977, respectively.
13:
284:
14:
816:
490:Earliest unambiguous cephalopods
44:
586:the earliest cephalopod group
272:The belemnite-cuttlefish-like
1:
785:Prehistoric cephalopod orders
645:Probable misidentified genera
616:Earliest coiled cephalopods:
204:
800:Ordovician first appearances
257:(listed by first occurrence)
7:
217:Paleobiology -Dissidocerida
10:
821:
530:Probable coleoid ancestor
713:
638:
579:
485:
476:
416:
396:
336:
309:
300:
282:
263:
128:
123:
41:Scientific classification
39:
23:
16:Extinct order of molluscs
790:Ordovician cephalopods
289:
27:Temporal range: Lower
752:Paleobiology Database
288:
140:is an order of Early
805:Silurian extinctions
795:Silurian cephalopods
200:Dissidoceras undosum
157:Dissidoceras undosum
186:Murchison 1839 and
290:
767:
766:
707:Taxon identifiers
698:
697:
634:
633:
472:
471:
380:Paleocirroteuthis
135:
134:
119:
118:Zhuravleva (1994)
812:
760:
759:
747:
746:
734:
733:
732:
702:
701:
483:
482:
346:Muensterelloidea
307:
306:
258:
246:
239:
232:
223:
222:
192:Troedssonellidae
176:Troedssonellidae
172:Rangeroceratidae
117:
112:
99:
49:
48:
21:
20:
820:
819:
815:
814:
813:
811:
810:
809:
780:Orthoceratoidea
770:
769:
768:
763:
755:
750:
742:
737:
728:
727:
722:
709:
699:
694:
630:
588:Ellesmerocerida
575:
571:Phragmoteuthids
494:Plectronocerida
468:
412:
392:
332:
296:
293:
280:
259:
256:
252:Notable fossil
250:
207:
180:Dissidocertidae
116:
110:
101:Orthoceratoidea
97:
43:
35:
25:
17:
12:
11:
5:
818:
808:
807:
802:
797:
792:
787:
782:
765:
764:
762:
761:
748:
735:
719:
717:
711:
710:
696:
695:
693:
692:
685:
678:
671:
666:
651:Nectocarididae
648:
646:
642:
640:
636:
635:
632:
631:
629:
628:
620:
614:
604:
590:
584:
580:
577:
576:
574:
573:
568:
558:
555:Syllipsimopodi
534:
528:
518:
514:
513:
504:Monoplacophora
499:Plectronoceras
486:
480:
474:
473:
470:
469:
467:
466:
465:
464:
461:Belemnotheutis
457:
450:
437:
426:
424:
417:
414:
413:
411:
410:
404:
397:
394:
393:
391:
390:
383:
376:
369:
362:
355:
348:
343:
341:
340:Early coleoids
337:
334:
333:
331:
330:
324:
319:
317:
310:
304:
298:
297:
283:
281:
279:
278:
269:
267:
261:
260:
249:
248:
241:
234:
226:
220:
219:
214:
211:
206:
203:
146:Early Silurian
133:
132:
126:
125:
121:
120:
108:
104:
103:
95:
91:
90:
85:
81:
80:
75:
71:
70:
65:
61:
60:
55:
51:
50:
37:
36:
26:
15:
9:
6:
4:
3:
2:
817:
806:
803:
801:
798:
796:
793:
791:
788:
786:
783:
781:
778:
777:
775:
758:
753:
749:
745:
740:
736:
731:
725:
721:
720:
718:
716:
715:Dissidocerida
712:
708:
703:
691:
690:
686:
684:
683:
679:
677:
676:
672:
670:
667:
664:
663:
658:
657:
652:
649:
647:
644:
643:
641:
639:Misidentified
637:
627:
626:
621:
619:
615:
613:
609:
605:
603:
599:
595:
591:
589:
585:
582:
581:
578:
572:
569:
567:
563:
559:
557:
556:
551:
550:
545:
544:
539:
535:
533:
529:
526:
522:
519:
516:
515:
511:
510:
505:
501:
500:
495:
491:
488:
487:
484:
481:
479:
475:
463:
462:
458:
456:
455:
451:
449:
448:
444:
443:
441:
438:
436:
435:
430:
427:
425:
423:
419:
418:
415:
409:
405:
402:
399:
398:
395:
389:
388:
384:
382:
381:
377:
375:
374:
370:
368:
367:
363:
361:
360:
359:Styletoctopus
356:
354:
353:
352:Proteroctopus
349:
347:
344:
342:
339:
338:
335:
329:
325:
323:
320:
318:
316:
312:
311:
308:
305:
303:
299:
295:
287:
277:
276:
271:
270:
268:
266:
262:
255:
247:
242:
240:
235:
233:
228:
227:
224:
218:
215:
212:
209:
208:
202:
201:
197:
196:Troedssonella
193:
189:
185:
181:
177:
173:
169:
164:
162:
158:
153:
151:
147:
143:
139:
138:Dissidocerida
131:
127:
122:
115:
114:Dissidocerida
109:
106:
105:
102:
96:
93:
92:
89:
86:
83:
82:
79:
76:
73:
72:
69:
66:
63:
62:
59:
56:
53:
52:
47:
42:
38:
34:
30:
24:Dissidocerida
22:
19:
714:
687:
682:Shelbyoceras
680:
675:Volborthella
673:
669:Kirengellida
660:
654:
623:
618:Tarphycerida
606:Brevicones:
602:Actinocerida
592:Orthocones:
566:Aulacocerids
553:
549:Gordoniconus
547:
541:
509:Knightoconus
507:
506:-like form:
497:
489:
459:
452:
445:
432:
387:Vampyronassa
385:
378:
373:Palaeoctopus
371:
364:
357:
350:
292:Evolution of
273:
199:
195:
188:Rangeroceras
187:
183:
165:
156:
154:
137:
136:
129:
113:
18:
622:Spirulid?:
598:Orthocerida
583:Early forms
454:Belemnopsis
429:Diplobelids
322:Nautilaceae
294:cephalopods
254:cephalopods
168:Polymeridae
88:Cephalopoda
774:Categories
662:Nectocotis
656:Nectocaris
625:Shimanskya
612:Oncocerida
608:Ascocerida
594:Endocerida
562:belemnoids
532:Bactritida
478:Palaeozoic
447:Belemnites
440:Belemnites
434:Diplobelus
422:belemnoids
315:nautiloids
275:Belosaepia
205:References
142:Ordovician
94:Subclass:
29:Ordovician
689:Pohlsepia
560:Earliest
543:Jeletzkya
527:ammonoids
521:Goniatite
420:Advanced
408:Nautilida
403:ammonoids
401:Ceratitid
328:ammonites
313:Advanced
184:Polymeres
161:siphuncle
150:siphuncle
130:See text
124:Families
64:Kingdom:
58:Eukaryota
730:Q5282776
724:Wikidata
538:coleoids
525:ceratite
302:Mesozoic
265:Cenozoic
78:Mollusca
74:Phylum:
68:Animalia
54:Domain:
33:Silurian
31:- Lower
366:Keuppia
144:to the
107:Order:
84:Class:
757:142974
536:Early
178:, and
744:11846
739:IRMNG
406:late
326:True
523:and
653:: (
546:?,
776::
754::
741::
726::
659:,
610:,
600:,
596:,
564::
552:,
540::
502:,
496::
492::
442::
431::
174:,
170:,
665:)
512:?
245:e
238:t
231:v
111:†
98:†
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
