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Placeticeratids are characterized by rather involute compressed shells of moderate to large size with narrow flat or grooved venters (outer rims), at least on early whorls. Most are rather smooth or weakly ornamented except for a few later forms in which the outer whorls are strongly tuberculate. The
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suture has numerous, including auxiliary and adventive, elements. Saddles and lobes are typically deep, narrow necked, and raggedly embayed.
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The
Placenticeratidae had their beginning in the Late Albian stage at the end of the Early Cretaceous, starting with
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of the Upper
Cretaceous. The family has the longest duration of the Hoplitaceae, extending well into the
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316:. Geol. Soc. of America and Univ. Kansas Press.
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272:, appears later and is known from the upper
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312:Treatise on Invertebrate Paleontology
253:by an increase in suture complexity.
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233:is an extinct family of mostly Late
474:. You can help Knowledge (XXG) by
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245:) included in the superfamily
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16:Family of molluscs (fossil)
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541:Maastrichtian extinctions
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53:Scientific classification
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536:Albian first appearances
213:Rapidoplacenticeratinae
470:-related article is a
433:Paleobiology Database
314:, Part L (Ammonoidea)
310:Mesozoic Ammonoidea;
287:Hoplitoplacenticeras
185:Hoplitoplacenticeras
526:Ammonitida families
249:, derived from the
46:Placenticeras meeki
266:. The type genus,
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420:Open Tree of Life
334:Placenticeratidae
326:Taxon identifiers
231:Placenticeratidae
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192:Metaplacenticeras
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27:Temporal range:
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531:Hoplitoidea
394:iNaturalist
247:Hoplitoidea
237:ammonites (
178:Hengestites
156:Hyatt, 1900
139:Hoplitoidea
100:Cephalopoda
515:Categories
468:Ammonitina
294:References
243:Ammonitida
239:cephalopod
235:Cretaceous
171:Gissarites
126:Ammonitida
113:Ammonoidea
106:Subclass:
278:Campanian
274:Santonian
76:Kingdom:
70:Eukaryota
357:BioLib:
349:Q7200307
343:Wikidata
308:, 1957.
145:Family:
90:Mollusca
86:Phylum:
80:Animalia
66:Domain:
425:2868943
386:4626167
360:1140206
304:Arkell
299:Sources
162:Genera
119:Order:
96:Class:
412:101793
399:706722
306:et al.
241:order
466:This
438:61786
407:IRMNG
373:625P6
472:stub
381:GBIF
368:CoL
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503:e
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489:v
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149:†
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123:†
110:†
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