127:
406:
106:
527:
but the glabella is diamond-shaped in outline, and it has a ridge along the midline (it is carinate). The glabella gradually transforms into the spine, which makes it difficult to determine where the spine begins. The long median glabellar spine is subquadrate in section and is directed horizontally
528:
forward, from the frontal tip of the glabella. The glabella has 2 pairs of muscle scars. The genal spines are also subquadrate in section. The thorax has 5 segments. The pleural regions of pygidium have 2 pairs of narrow pleural furrows.
726:
978:
973:
462:
is known from the Upper
Ordovician of Estonia (Narva open pit, and Lasnamägi, Kukruse Stage, Sandbian) and Latvia (Remte 3 borehole, and Adze 6 borehole, Kukruse Stage,
547:
869:
856:
456:
was collected from the
Ordovician of Nevada (Eureka Quartzite, sandy limestone, 60–90 ft above base, Ranger Mountains, Nevada Test Site))
963:
771:
472:
was excavated from the Middle
Ordovician of Argentina (Portillo del Cajón, Cerro Morado; Cerro Suri; Puesto El Despacho; Las Pircas; all
983:
785:
988:
933:
699:. Tallinn University of Technology, University of Tartu, Finnish Museum of Natural History, Swedish Museum of Natural History
938:
722:. Department of Geology, University of Kansas Special Publication. Lawrence: University of Kansas Press. pp. 1–276.
943:
126:
968:
958:
953:
948:
776:, Boulder, CO & Lawrence, KA: The Geological Society of America & The University of Kansas Press, pp.
338:
487:
928:
623:
923:
420:
is found in the Upper
Ordovician of the United States (Lower Member and Botetourt limestone Member, of the
801:
602:
Whittington, H. B.; Kindle., C.H. (1963). "Middle
Ordovician Table Head Formation, western Newfoundland".
895:
432:
630:
337:, and had a long straight sword-like frontal spine, that gradually transforms into the relatively long
584:
611:
437:
473:
421:
378:
121:
752:
900:
753:
On the lower
Didymograptus zone (3B) at Ringsaker, and contemporaneous deposits in Scandinavian
548:
New data on trilobites from Hecker mud mounds (Ordovician) in the
Leningrad region (in Russian)
882:
874:
843:
781:
649:
447:
341:. Both the glabellar spine and the backward directed genal spines are subquadrate in section.
887:
619:
573:
382:
405:
105:
564:
Whittington, H. B.; I.I. Evitt, W.R. (1953). "Silicified
Middled Ordovician trilobites".
615:
334:
197:
345:
has five thorax segments and the pleural area of the pygidium has two narrow furrows.
917:
386:
63:
358:
223:
848:
38:
824:
483:
424:, Shenandoah County, Virginia, 39.0° N, 78.4° W Blackriveran 460.9 - 449.5 Ma)
330:
83:
48:
32:
671:
516:
512:
482:
occurs in the Lower
Ordovician of the Russian Federation (Volkhovian level,
350:
326:
171:
158:
138:
88:
490:
and Babino quarries, St.Petersburg region). It was originally described as
835:
818:
672:"Brachiopods and Trilobites from the Basin Ranges, Western United States"
552:
Vestnik Sankt-Petersburgskogo
Universiteta, Seriya Geologiya i Geografiya
463:
394:
390:
184:
78:
73:
58:
53:
43:
861:
362:
238:
93:
68:
577:
374:
370:
366:
354:
148:
795:
524:
404:
322:
692:
799:
446:
is present in the Upper Ordovician of Oklahoma, United States (
430:
is present in the Middle Ordovician of Newfoundland, Canada (
624:
10.1130/0016-7606(1963)74[745:mothfw]2.0.co;2
650:"Genal spine attached to Ampyx (Lonchodomas) mcgeheei"
808:
440:; Table Point, "Middle Table Head" and Table Cove).
681:. Geological Survey Professional Paper 523-D.
8:
693:"Species Lonchodomas rostratus (Sars, 1835)"
542:
540:
979:Paleozoic life of the Northwest Territories
974:Paleozoic life of Newfoundland and Labrador
727:"Lonchodomas suriensis occurrences listing"
796:
104:
20:
718:Harrington, H.J.; Leanza, A.F. (1957).
536:
604:Geological Society of America Bulletin
772:Treatise on Invertebrate Paleontology
566:Geological Society of America Memoirs
7:
720:Ordovician trilobites of Argentina
14:
774:, Part O, Arthropoda 1, Trilobita
657:Journal of the Academy of Science
519:) are subtriangular in outline.
125:
511:is eyeless. The headshield (or
116:, Bromide Formation, Oklahoma
1:
679:Contributions to Paleontology
295:Harrington & Leanza, 1957
964:Fossils of the United States
498:in 1952 by Steinar Skjeseth.
349:occurred in what are today
333:. It was eyeless, like all
287:Ross jr. & Barnes, 1967
16:Extinct genus of trilobites
1005:
769:Moore, R. C., ed. (1959),
751:Steinar Skjeseth, 1952. "
244:
237:
229:
222:
122:Scientific classification
120:
112:
103:
23:
984:Paleozoic life of Quebec
507:Like all raphiophorids,
329:, that lived during the
989:Paleozoic life of Yukon
759:., v. 30, p. 138 — 182.
670:Ross, R.J. jr. (1967).
733:. Macquarie University
413:
934:Ordovician trilobites
896:Paleobiology Database
780:+ 560 pp., 415 figs,
731:Paleobiology Database
697:Baltoscandian fossils
648:Decker, C.E. (1939).
635:Paleobiology Database
589:Paleobiology Database
546:A.V. Krylov (2003). "
515:) and tailshield (or
433:Histiodella kristinae
410:Lonchodomas suriensis
408:
939:Fossils of Argentina
438:Table Cove Formation
757:Norsk geol. tidsskr
616:1963GSAB...74..745W
422:Edinburgh Formation
944:Fossils of Estonia
414:
379:Russian Federation
969:Bromide Formation
959:Fossils of Russia
954:Fossils of Norway
949:Fossils of Latvia
911:
910:
883:Open Tree of Life
802:Taxon identifiers
523:looks a lot like
448:Bromide Formation
314:
313:
304:
296:
288:
276:
268:
267:Whittington, 1965
260:
252:
218:
996:
904:
903:
891:
890:
878:
877:
865:
864:
852:
851:
839:
838:
829:
828:
827:
797:
791:
790:
766:
760:
749:
743:
742:
740:
738:
723:
715:
709:
708:
706:
704:
689:
683:
682:
676:
667:
661:
660:
654:
645:
639:
638:
627:
599:
593:
592:
581:
578:10.1130/mem59-p1
561:
555:
544:
494:but assigned to
383:Leningrad Oblast
302:
294:
286:
274:
266:
258:
250:
216:
209:
196:
183:
170:
130:
129:
108:
98:
35:
29:Temporal range:
21:
1004:
1003:
999:
998:
997:
995:
994:
993:
929:Asaphida genera
914:
913:
912:
907:
899:
894:
886:
881:
873:
868:
860:
855:
847:
842:
834:
832:
823:
822:
817:
804:
794:
788:
768:
767:
763:
750:
746:
736:
734:
725:
717:
716:
712:
702:
700:
691:
690:
686:
674:
669:
668:
664:
652:
647:
646:
642:
629:
601:
600:
596:
583:
563:
562:
558:
545:
538:
534:
505:
492:Ampyx volborthi
436:conodont zone,
403:
307:Ampyx volborthi
303:(Schmidt, 1894)
233:
215:
207:
194:
181:
168:
124:
99:
97:
96:
91:
86:
81:
76:
71:
66:
61:
56:
51:
46:
41:
31:
30:
27:
17:
12:
11:
5:
1002:
1000:
992:
991:
986:
981:
976:
971:
966:
961:
956:
951:
946:
941:
936:
931:
926:
924:Raphiophoridae
916:
915:
909:
908:
906:
905:
892:
879:
866:
853:
840:
830:
814:
812:
806:
805:
800:
793:
792:
786:
761:
744:
710:
684:
662:
640:
610:(6): 745–758.
594:
556:
535:
533:
530:
504:
501:
500:
499:
477:
467:
457:
451:
441:
425:
402:
399:
312:
311:
310:
309:
297:
289:
281:
279:Ampyx mcgeheei
275:(Decker, 1931)
269:
261:
253:
242:
241:
235:
234:
231:Ampyx rostrata
227:
226:
220:
219:
205:
201:
200:
198:Raphiophoridae
192:
188:
187:
179:
175:
174:
166:
162:
161:
156:
152:
151:
146:
142:
141:
136:
132:
131:
118:
117:
110:
109:
101:
100:
92:
87:
82:
77:
72:
67:
62:
57:
52:
47:
42:
37:
36:
28:
15:
13:
10:
9:
6:
4:
3:
2:
1001:
990:
987:
985:
982:
980:
977:
975:
972:
970:
967:
965:
962:
960:
957:
955:
952:
950:
947:
945:
942:
940:
937:
935:
932:
930:
927:
925:
922:
921:
919:
902:
897:
893:
889:
884:
880:
876:
871:
867:
863:
858:
854:
850:
845:
841:
837:
831:
826:
820:
816:
815:
813:
811:
807:
803:
798:
789:
787:0-8137-3015-5
783:
779:
775:
773:
765:
762:
758:
754:
748:
745:
732:
728:
721:
714:
711:
698:
694:
688:
685:
680:
673:
666:
663:
658:
651:
644:
641:
636:
632:
625:
621:
617:
613:
609:
605:
598:
595:
590:
586:
579:
575:
571:
567:
560:
557:
553:
549:
543:
541:
537:
531:
529:
526:
522:
518:
514:
510:
502:
497:
493:
489:
485:
481:
478:
475:
471:
468:
465:
461:
458:
455:
454:L. retrolatus
452:
449:
445:
442:
439:
435:
434:
429:
426:
423:
419:
416:
415:
411:
407:
400:
398:
396:
392:
388:
387:United States
384:
380:
376:
372:
368:
364:
360:
356:
352:
348:
344:
340:
336:
335:raphiophorids
332:
328:
324:
320:
319:
308:
301:
298:
293:
290:
285:
284:L. retrolatus
282:
280:
273:
270:
265:
262:
257:
254:
249:
246:
245:
243:
240:
236:
232:
228:
225:
221:
217:Angelin, 1854
214:
213:
206:
203:
202:
199:
193:
190:
189:
186:
180:
177:
176:
173:
167:
164:
163:
160:
157:
154:
153:
150:
147:
144:
143:
140:
137:
134:
133:
128:
123:
119:
115:
111:
107:
102:
95:
90:
85:
80:
75:
70:
65:
60:
55:
50:
45:
40:
34:
26:
22:
19:
809:
777:
770:
764:
756:
747:
735:. Retrieved
730:
719:
713:
703:14 September
701:. Retrieved
696:
687:
678:
665:
656:
643:
634:
607:
603:
597:
588:
569:
565:
559:
551:
520:
508:
506:
495:
491:
480:L. volborthi
479:
470:L. suriensis
469:
460:L. rostratus
459:
453:
450:, Sandbian).
443:
431:
427:
418:L. carinatus
417:
409:
401:Distribution
359:Newfoundland
346:
342:
317:
316:
315:
306:
300:L. volborthi
299:
292:L. suriensis
291:
283:
278:
271:
263:
259:Cooper, 1953
256:L. carinatus
255:
251:(Sars, 1835)
248:L. rostratus
247:
230:
224:Type species
211:
210:
113:
24:
18:
810:Lonchodomas
554:3(33):95-96
521:Lonchodomas
509:Lonchodomas
503:Description
496:Lonchodomas
444:L. mcgeheei
428:L. clavulus
412:, 4 mm long
347:Lonchodomas
343:Lonchodomas
318:Lonchodomas
272:L. mcgeheei
264:L. clavulus
212:Lonchodomas
114:L. mcgeheei
25:Lonchodomas
918:Categories
659:: 107–108.
532:References
484:Syas River
385:) and the
331:Ordovician
327:trilobites
159:Arthropoda
33:Ordovician
737:1 October
724:cited in
628:cited in
582:cited in
572:: 1–139.
351:Argentina
172:Trilobita
145:Kingdom:
139:Eukaryota
833:BioLib:
825:Q6669670
819:Wikidata
631:"104800"
517:pygidium
513:cephalon
488:Putilovo
474:La Rioja
464:Sandbian
395:Virginia
391:Oklahoma
339:glabella
305:synonym
277:synonym
191:Family:
185:Asaphida
155:Phylum:
149:Animalia
135:Domain:
888:5129597
875:1054454
862:4635343
612:Bibcode
585:"73341"
363:Estonia
239:Species
204:Genus:
178:Order:
165:Class:
836:457196
784:
377:, the
375:Sweden
371:Norway
367:Latvia
355:Canada
901:20035
870:IRMNG
675:(PDF)
653:(PDF)
525:Ampyx
323:genus
321:is a
857:GBIF
849:5GB9
782:ISBN
739:2013
705:2013
39:PreꞒ
844:CoL
778:xix
755:":
620:doi
574:doi
550:".
397:).
361:),
325:of
920::
898::
885::
872::
859::
846::
821::
729:.
695:.
677:.
655:.
633:.
618:.
608:74
606:.
587:.
570:59
568:.
539:^
486:,
466:).
393:,
373:,
369:,
365:,
353:,
89:Pg
741:.
707:.
637:.
626:.
622::
614::
591:.
580:.
576::
476:)
389:(
381:(
357:(
208:†
195:†
182:†
169:†
94:N
84:K
79:J
74:T
69:P
64:C
59:D
54:S
49:O
44:Ꞓ
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