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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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- 2129 (xsd:nonNegativeInteger)
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- *Grammoceras striatulum
*Grammoceras chateleti
*Grammoceras thouarsense
*Grammoceras penestriatulum
*Grammoceras arenaceum
*Grammoceras glabrum (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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