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It had growth layers like tree rings, seen within the cavity of the organism and when the cone is sectioned. The cone was light-brown and glassy in appearance. It is distributed widely in North
America. A specimen of a belemnoid had been found in Germany, clearly preserving 10 tentacles as carbon
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was a squidlike animal, probably related to the ancestors of modern squids and cuttlefish. The shell was internal. The rostrum or guard is found the most often and possesses a distinctive slit at its ventral surface and a ridge on the dorsal surface. The phragmocone (internal shell) has a small
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at its tip, and fit into the cavity and the guard. It also had septa and a ventral siphuncle (tube filled with living tissues running through chambers) within the phragmocone, projecting forward as a beak-like blade.
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Neal L. Larson; Steven D. Jorgensen; Robert A. Farrar & Peter L. Larson (1997).
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National
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Ammonites and the Other
Cephalopods of the Pierre Seaway
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films, showing that belemnoids are similar to squids.
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342:. Geoscience Press, Inc. p. 94.
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293:, reference standard in research.
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642:Cretaceous cephalopods of Europe
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637:Prehistoric cephalopod genera
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652:Prehistoric cephalopod stubs
585:. You can help Knowledge by
525:. You can help Knowledge by
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312:(Smithsonian Handbooks) by
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124:Scientific classification
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657:Cretaceous animal stubs
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521:-related article is a
287:Belemnitella americana
116:Belemnitella americana
574:This article about a
484:Paleobiology Database
389:Paleobiology Database
234:Belemnitella bulbosa
16:Genus of cephalopods
375:Paleontology portal
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517:This prehistoric
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471:Open Tree of Life
400:Taxon identifiers
291:Pee Dee Belemnite
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32:84.9β66.043
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445:iNaturalist
184:Belemnitida
171:Cephalopoda
632:Belemnites
626:Categories
576:Cretaceous
519:cephalopod
328:(Page 536)
316:(Page 163)
314:David Ward
297:References
276:protoconch
257:from the
255:belemnite
217:d'Orbigny
147:Kingdom:
141:Eukaryota
423:Q4119899
417:Wikidata
225:Species
190:Family:
161:Mollusca
157:Phylum:
151:Animalia
137:Domain:
476:4154645
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387:in the
310:Fossils
203:Genus:
177:Order:
167:Class:
579:animal
450:480154
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263:Europe
219:, 1840
581:is a
489:15842
458:IRMNG
251:genus
249:is a
583:stub
523:stub
432:GBIF
344:ISBN
265:and
40:Preκ
261:of
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90:Pg
34:Ma
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207:β
194:β
181:β
95:N
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80:J
75:T
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65:C
60:D
55:S
50:O
45:κ
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