Rank Genus | Superfamily Hildocerataceae | |
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Asthenoceras is a dwarfish, Middle Jurassic (Lower Bajocian) ammonoid with an evolute, smooth, compressed, discoidal, strongly keeled shell. Asthenoceras belongs to the Hildoceratidae (subfamily Grammoceratinae) and may be a subgenus of the Lower Jurassic (Upper Toarcian) Grammoceras.
References
Asthenoceras Wikipedia(Text) CC BY-SA