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The
Eoderoceratidae can be divided into two subfamilies, the Xiphoceratinae which is the earliest and in which there is an early maximum development of spines of the inner whorls, and the Eoderoceratinae. Two other subfamilies were included in the Treatise 1957 but are now regarded as families in
199:. Spines, or tubercles, are typically found in two rows on the inner and outer parts of the whorl sides, joined by radial ribs. These are often more developed on the inner and middle whorls, becoming less so or absent on the outer. Sutures are highly complex.
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cephalopods, characterized by evolute, commonly serpenticonic, shells that had long body chambers and would have had no stable floating position; and thus resemble contemporary
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Donovan, D.T. Callomon and
Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association.
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231:. Those attributable to the Eoderoceratinae include
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187:is the ancestral and most primitive family of the
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273:Treatise on Invertebrate Paleontology
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425:. You can help Knowledge (XXG) by
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203:their own right, These are the
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268:, 1957. Mesozoic Ammonoidea,
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487:Early Jurassic extinctions
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62:Scientific classification
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421:-related article is a
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472:Ammonitida families
55:Xipheroceras ziphus
27:Temporal range: L
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371:Open Tree of Life
290:Taxon identifiers
246:Neomicroderoceras
205:Phricodoceratidae
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240:Eoderoceras
216:Bifericeras
165:Spath, 1929
109:Cephalopoda
466:Categories
419:Ammonitina
259:References
228:Xiphoceras
135:Ammonitida
122:Ammonoidea
115:Subclass:
177:See text
85:Kingdom:
79:Eukaryota
321:BioLib:
313:Q5381652
307:Wikidata
193:ammonite
154:Family:
99:Mollusca
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89:Animalia
75:Domain:
29:Jurassic
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264:Arkell
171:Genera
128:Order:
105:Class:
389:194019
363:100056
324:134018
266:et al.
249:, and
225:, and
37:Pleins
417:This
358:IRMNG
337:623ZY
423:stub
345:GBIF
207:and
33:Sine
332:CoL
35:-L
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270:in
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454:e
447:t
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158:†
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31:(
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