| 单词 | phragmocone |
| 例句 | When Whalen first examined the fossil, he looked for the phragmocone, a chambered shell characteristic of most fossil cephalopods that helps them control buoyancy. Fossil of Vampire Squid’s Oldest Ancestor Is Named for Biden 2022-03-11T05:00:00Z A nautilus’ phragmocone is its coiled shell; a cuttlefish’s is its cuttlebone. Fossil of Vampire Squid’s Oldest Ancestor Is Named for Biden 2022-03-11T05:00:00Z The fossilized chambers of a phragmocone are divided by mineralized sheets, which are very distinctive and generally well-preserved, Whalen said. Fossil of Vampire Squid’s Oldest Ancestor Is Named for Biden 2022-03-11T05:00:00Z Klug disputed this conclusion, suggesting the shell is instead a deformed phragmocone and body chamber of G. beargulchensis, the known cephalopod. Fossil of Vampire Squid’s Oldest Ancestor Is Named for Biden 2022-03-11T05:00:00Z |
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