194:
has a slender, subcylindrical shell with a bluntly pointed apex, long chambers, straight transverse sutures, and a smooth or faintly cancellated surface. The siphuncle is central, tubular, and empty; septal necks short, orthochoanitic; connecting rings cylindrical or only faintly expanded. Chambers
227:
Sweet, W.C. 1964. Nautiloidea- Orthocerida. Treatise on
Invertebrate Paleontology, Part K. Geol. Soc. of America and Univ Kansas Press
236:
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has been found in Upper
Triassic sediments in Afghanistan, Kazakhstan, and the Russian Federation.
36:
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contain prominent lamellar mural and episeptal deposits.
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169:of Europe and Asia named by Eichwald in 1851.
8:
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20:
223:
221:
217:
7:
165:nautiloid cephalopod from the Upper
14:
1:
16:Extinct genus of nautiloids
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37:Scientific classification
35:
23:
286:Paleobiology Database
131:Michelinoceratinae
27:Temporal range: U
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254:Taxon identifiers
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108:Orthocerataceae
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182:Orthoceratidae
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149:Eichwald, 1851
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120:Orthoceratidae
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103:Superfamily:
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262:Trematoceras
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240:-Paleobio db
238:Trematoceras
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204:Trematoceras
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199:Distribution
192:Trematoceras
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158:Trematoceras
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143:Trematoceras
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24:Trematoceras
18:
127:Subfamily:
96:Orthocerida
84:Nautiloidea
72:Cephalopoda
314:Nautiloids
211:References
187:Morphology
163:orthoconic
79:Subclass:
43:Kingdom:
308:Category
277:Q7838046
271:Wikidata
173:Taxonomy
167:Triassic
115:Family:
60:Mollusca
55:Phylum:
48:Animalia
29:Triassic
137:Genus:
91:Order:
67:Class:
161:is an
291:12618
310::
288::
273::
220:^
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