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・ Procyanidin B6
・ Procyanidin B8
・ Procyanidin C1
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・ Procyanidin dimer
・ Procycle Group
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Procymatoceras
・ Procymbopteryx
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・ Procynosuchidae
・ Procynosuchus
・ PROCYON
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・ Procyon (disambiguation)
・ Procyon (genus)
・ Procyon Peaks
・ Procyonidae
・ Procypha
・ Procypris


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Procymatoceras : ウィキペディア英語版
Procymatoceras


''Procymatoceras'' is a nautiloid cephalopod from the Middle Jurassic with a large, tightly involute, rapidly expanding shell. Early, inner, whorls are round in cross section. Later, outer, whorls, and mature living chamber are flattened on the sides and venter. Surface covered with sinuous ribs. Sutures have shallow ventral and dorsal lobes. Probably gave rise to ''Cymatonautilus'' and is the likely ancestor of ''Cymatoceras'' and ''Paracymatoceras''. ''Procymatoceras'' has its origin in the earliest Nautilidae, in ''Cenoceras''.
==References==

*Bernhard Kümmel, 1964. Nautiloidea - Nautilida. Treatise on iInvertebrate Paleontology Part K. Geol. Soc. of America and Univ. Kans. Press, Teichert & Moore (eds)

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