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has a very involute shell with slightly convex sides and a very narrow venter. Side are smooth or with faint sinuous ribs. Early whorls have umbilical tubercles that in later whorls appear higher on the sides. Earlier whorls normally have lower and fine upper ventrolateral clavi. Ornament weakens in
446:
461:
431:
546:
W. A. Cobban and Hook, S. C. 1983 Mid-Cretaceous (Turonian) ammonite fauna from Fence Lake area of west-central New Mexico. Memoir 41, New Mexico Bureau of Mines&Mineral
Resources, Socorro NM.
634:
556:
Discovering
Fossils: How to Find and Identify Remains of the Prehistoric Past (Fossils & Dinosaurs) by Frank A. Garcia, Donald S. Miller, and Jasper Burns
553:(Mantell) ammonite fauna from Upper Cretaceous of Western Interior, United States. Memoir 37, New Mexico Bureau of Mines&Mineral Resources, Socorro NM.
281:
the adult and the last whorl may be smooth. The suture is with numerous adventitious and auxiliary elements, with saddles and lobes that are much frilled.
729:
621:
540:
270:
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290:
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513:
783:
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226:
171:
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41:
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Part L. Geological Soc. of
America, Univ of Kansas Press. R.C. Moore, (Ed)
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have been found in Asia, Europe, North and South
America.
703:
583:
723:
8:
730:
716:
571:
49:
31:
406:
541:Treatise on Invertebrate Paleontology
271:Royal Tyrrell Museum of Palaeontology
7:
684:
682:
551:Collignoniceras woollgari wooollgari
549:W. A. Cobban and Hook, S. C. 1979,
702:. You can help Knowledge (XXG) by
229:, 1870, is the type genus for the
25:
342:Placenticeras memoriaschloenbachi
686:
494:
479:
460:
445:
430:
411:
69:
233:, a family that is part of the
539:, 1957, Mesozoic Ammonoidea,
1:
388:Stantonoceras pseudocostatum
374:Placenticeras pseudoplacenta
337:Placenticeras mediasiaticum
800:
779:Ammonites of South America
774:Ammonites of North America
764:Cretaceous animals of Asia
681:
289:Species list according to
27:Genus of molluscs (fossil)
759:Late Cretaceous ammonites
399:Placenticeras vredenburgi
379:Placenticeras semiornatum
354:Placenticeras orbignyanum
322:Placenticeras intercalare
317:Placenticeras grossouvrei
186:
179:
66:Scientific classification
64:
57:
48:
34:
489:with mosasaur bite marks
440:with mosasaur bite marks
404:Placenticeras whitfieldi
359:Placenticeras paraplanum
327:Placenticeras kolbajense
297:Placenticeras bidorsatum
394:Placenticeras tamulicum
369:Placenticeras polyopsis
332:Placenticeras maherndli
237:, a superfamily of the
698:-related article is a
423:Pierre Shale Formation
364:Placenticeras placenta
312:Placenticeras fritschi
307:Placenticeras cumminsi
302:Placenticeras costatum
274:
227:Fielding Bradford Meek
18:Placenticeras cumminsi
661:Paleobiology Database
566:Paleobiology Database
504:sp. showing sutures.
384:Placenticeras syrtale
252:
769:Ammonites of Europe
348:Placenticeras meeki
59:Placenticeras meeki
275:
754:Ammonitida genera
749:Placenticeratidae
711:
710:
676:
675:
648:Open Tree of Life
577:Taxon identifiers
474:, Alberta, Canada
472:Bearpaw Formation
267:Bearpaw Formation
231:Placenticeratidae
195:
194:
175:
152:Placenticeratidae
16:(Redirected from
791:
784:Ammonitina stubs
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510:Upper Cretaceous
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40:Temporal range:
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455:showing sutures
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208:Late Cretaceous
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42:Late Cretaceous
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468:P. intercalare
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425:, South Dakota
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202:is a genus of
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585:Placenticeras
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561:Placenticeras
558:
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502:Placenticeras
497:
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487:P. whitfieldi
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278:Placenticeras
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254:Placenticeras
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223:Placenticeras
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199:Placenticeras
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189:Diplacmoceras
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166:Placenticeras
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36:Placenticeras
33:
30:
19:
704:expanding it
693:
678:
584:
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536:
518:South Dakota
514:Meade County
506:Pierre Shale
501:
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58:
35:
29:
438:P. placenta
419:P. costatum
245:Description
235:Hoplitoidea
225:, named by
113:Cephalopoda
743:Categories
696:Ammonitina
530:References
470:ammolite,
239:Ammonitida
139:Ammonitida
126:Ammonoidea
119:Subclass:
269:. At the
206:from the
204:ammonites
89:Kingdom:
83:Eukaryota
600:Q3906120
594:Wikidata
453:P. meeki
261:ammolite
218:Taxonomy
181:Synonyms
145:Family:
103:Mollusca
99:Phylum:
93:Animalia
79:Domain:
653:4154023
640:1101811
627:4626178
564:in the
535:Arkell
285:Species
212:fossils
158:Genus:
132:Order:
109:Class:
537:et al.
386:(syn.
210:. Its
174:, 1870
694:This
666:15403
635:IRMNG
700:stub
622:GBIF
614:6R3V
172:Meek
609:CoL
522:USA
745::
663::
650::
637::
624::
611::
596::
516:,
512:;
508:,
421:,
292::
256:sp
241:.
731:e
724:t
717:v
706:.
524:)
520:(
390:)
273:.
264:,
258:.
162:†
149:†
136:†
123:†
20:)
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