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260:. Shells are evolute so that all whorls are exposed and have strong ribbing that bifurcates, that is splits in two, on the flanks. Many have tubercles at the point of bifurcation. Whorl sections are generally subequant; the outer rim, or venter, commonly rounded.
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Arkell, Kummel, and Wright, 1957. Mesozoic
Ammonoidea; Treatise on Invertebrate Paleontology, Part L, Mollusca 4.
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267:. Their fossils are found in upper Middle- and lower Upper Jurassic sediments.
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263:Stephanoceratidae is derived from the
252:is a family of planulate and coronate
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515:. You can help Knowledge (XXG) by
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572:Middle Jurassic first appearances
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30:Middle Jurassic–Upper Jurassic
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16:Extinct family of ammonites
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577:Late Jurassic extinctions
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125:Scientific classification
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511:-related article is a
271:Subfamilies and genera
110:Stephanoceras blagdeni
477:Paleobiology Database
562:Ammonitida families
567:Stephanoceratoidea
258:Stephanoceratoidea
211:Stephanoceratoidea
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464:Open Tree of Life
391:Stephanoceratidae
383:Taxon identifiers
297:Stephanoceratinae
250:Stephanoceratidae
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224:Stephanoceratidae
24:Stephanoceratidae
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582:Ammonitina stubs
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331:Skolekostephanus
292:Mollistephaninae
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27:Temporal range:
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317:Kumatostephanus
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338:Stemmatoceras
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287:Garantianinae
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282:Frebolditinae
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236:Subfamilies
229:Neumayr 1875
223:
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324:Skirroceras
277:Cadomitinae
256:within the
172:Cephalopoda
556:Categories
509:Ammonitina
355:References
198:Ammonitida
185:Ammonoidea
178:Subclass:
303:Ermoceras
265:Otoitidae
254:ammonites
242:See text
148:Kingdom:
142:Eukaryota
112:from Mid
414:BioLib:
406:Q7608451
400:Wikidata
217:Family:
162:Mollusca
158:Phylum:
152:Animalia
138:Domain:
114:Jurassic
469:4954826
443:3245880
191:Order:
168:Class:
118:Germany
482:298980
456:103074
417:134090
507:This
451:IRMNG
513:stub
438:GBIF
35:PreꞒ
430:GNN
425:CoL
558::
479::
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363:^
116:-
85:Pg
544:e
537:t
530:v
519:.
221:†
208:†
195:†
182:†
90:N
80:K
75:J
70:T
65:P
60:C
55:D
50:S
45:O
40:Ꞓ
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