Asthenoceras

Asthenoceras; Temporal range: Bajocian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ammonitida
Superfamily:	Hildocerataceae
Family:	Hildoceratidae
Genus:	Asthenoceras; Buckman, 1899
Species
	See text.

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

^ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28. {{cite web}}: Cite has empty unknown parameter: |coauthors= (help)

Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.

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[Sepkoski_Ceph-1] Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28. {{cite web}}: Cite has empty unknown parameter: |coauthors= (help)

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