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Metrolytoceras : ウィキペディア英語版 | Metrolytoceras
''Metrolytoceras'' is an extinct cephalopod genus that lived during the Middle Jurassic, characterized by a planispiral evolute shell with smooth middle and outer whorls, flat sides, and simplified sutures. ''Metrolytoceras'' belongs to the ammonoid suborder Lytoceratina, which is typified by having intricate, moss-like sutures, and to the family Lytoceratidae. Its closest relative is ''Megalytoceras'' ==References==
* * Sepkoski, J. 2002. A compendium of fossil marine animal genera (Cephalopoda); Bulletins of American Paleontology vol 364 p.560 ()
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