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About: Grammoceras

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Grammoceras is an extinct genus of ammonite found in Yorks Ravenscar, England, from Jurassic period sediments. Its overall distribution is fairly worldwide. Grammoceras has a thin, discoidally evolute shell with simple, gently sigmoid ribbing and a low ventral keel. and from the same age are similar except that Dumortiera has a more rounded venter and Catulloceras has a subquadrate whorl section. Asthenoceras from the slightly younger lower Bajocian may be a subgenus.

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  • Grammoceras is an extinct genus of ammonite found in Yorks Ravenscar, England, from Jurassic period sediments. Its overall distribution is fairly worldwide. Grammoceras has a thin, discoidally evolute shell with simple, gently sigmoid ribbing and a low ventral keel. and from the same age are similar except that Dumortiera has a more rounded venter and Catulloceras has a subquadrate whorl section. Asthenoceras from the slightly younger lower Bajocian may be a subgenus. (en)
  • Grammoceras – rodzaj głowonogów z wymarłej podgromady amonitów, z rzędu Ammonitida. Żył w epoce wczesnej jury (toark). (pl)
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  • 35945497 (xsd:integer)
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  • 2129 (xsd:nonNegativeInteger)
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  • 1091680488 (xsd:integer)
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  • Hyatt, 1867 (en)
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  • *Grammoceras striatulum *Grammoceras chateleti *Grammoceras thouarsense *Grammoceras penestriatulum *Grammoceras arenaceum *Grammoceras glabrum (en)
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  • Species (en)
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  • Grammoceras (en)
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  • Grammoceras is an extinct genus of ammonite found in Yorks Ravenscar, England, from Jurassic period sediments. Its overall distribution is fairly worldwide. Grammoceras has a thin, discoidally evolute shell with simple, gently sigmoid ribbing and a low ventral keel. and from the same age are similar except that Dumortiera has a more rounded venter and Catulloceras has a subquadrate whorl section. Asthenoceras from the slightly younger lower Bajocian may be a subgenus. (en)
  • Grammoceras – rodzaj głowonogów z wymarłej podgromady amonitów, z rzędu Ammonitida. Żył w epoce wczesnej jury (toark). (pl)
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  • Grammoceras (en)
  • Grammoceras (pl)
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