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This category has the following 4 subcategories, out of 4 total.
155:
The following 80 pages are in this category, out of 80 total.
152:
Pages in category "Middle
Ordovician first appearances"
33:
694:
52:Category:Early Ordovician first appearances
31:, between 470 and 458.4 million years ago.
56:Category:Late Ordovician first appearances
136:Middle Ordovician genus first appearances
157:This list may not reflect recent changes
695:
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116:Darriwilian first appearances
708:Ordovician first appearances
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103:Dapingian first appearances
10:
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50:See also the preceding
25:Middle Ordovician epoch
703:Middle Ordovician life
591:Slender Oncoceratidae
380:Fenestella (bryozoan)
299:Cyrtogomphoceratidae
559:Reudemannoceratidae
54:and the succeeding
44:Paleontology portal
507:Perischoechinoidea
252:Barrandeoceratidae
640:Valcouroceratidae
623:Tripteroceratidae
185:Apocrinoceratidae
180:Allotrioceratidae
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657:Westonoceratidae
407:Graciloceratidae
402:Geisonoceratidae
294:Cyrtogomphoceras
200:Archinacelloidea
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662:Winneshiekia
652:Westonoceras
601:Strandoceras
441:Landeroceras
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397:Geisonoceras
348:Encrinuridae
279:Chaetocladus
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517:Plectoceras
497:Parryoceras
485:Orthotetida
331:Discosorida
284:Cornulitida
257:Bathmoceras
247:Baltoniodus
205:Armenoceras
170:Actinoceras
23:during the
697:Categories
618:Thelodonti
606:Symphysops
522:Pliomerina
512:Planaterga
475:Oncocerida
453:Nybyoceras
424:Kionoceras
385:Flexibilia
353:Encrinurus
326:Discoceras
321:Dekatriata
242:Baltoceras
220:Astraspida
87:(2 C, 3 P)
586:Sinoceras
502:Pectinida
480:Ormoceras
465:Oncoceras
368:Estlandia
358:Endoceras
343:Ecdyceras
316:Danoceras
304:Cystoidea
274:Ceraurus
225:Atrypida
581:Sagavia
120:(12 P)
140:(1 P)
107:(5 P)
19:that
27:of
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679:Z
647:W
635:V
613:T
571:S
549:R
492:P
460:O
448:N
436:L
414:K
392:G
375:F
338:E
311:D
264:C
237:B
165:A
129:G
96:D
72:A
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