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227:Pages in category "Ordovician first appearances"
232:This list may not reflect recent changes
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211:Ordovician species first appearances
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187:Middle Ordovician first appearances
115:Extant Ordovician first appearances
49:Category:Silurian first appearances
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43:See also the preceding
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564:Proterocameroceratidae
618:Stereoplasmoceratidae
69:Paleontology portal
47:and the succeeding
444:Hemicosmorthoceras
38:geological periods
679:Ordovician events
289:Carcinosomatoidea
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119:(1 C, 26 P)
102:(2 C, 53 P)
28:during the
673:Categories
660:Tryblidium
623:Styginidae
603:Sactoceras
559:Proetoidea
456:Ivoechiton
255:Ascocerida
143:(2 C, 3 P)
53:See also:
613:Stenaster
373:Eophacops
608:Spirifer
468:Liwiidae
309:Craniops
294:Chelodes
272:Blastoid
534:Phacops
26:evolved
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245:Acodus
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279:C
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240:A
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87:E
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