Jiagouceras

Jiagouceras Temporal range: Upper Cambrian (m-u Tremp) PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Order:	†Plectronocerida
Family:	†Plectronoceridae
Genus:	†Jiagouceras Chen, 1979

Jiagouceras is a genus of early primitive cephalopods from the Upper Cambrian of China, assigned to the Plectronoceratidae. The shell is small, nearly straight with a slight endogastric curvature and compressed cross section. The siphuncle is close to the ventral margin, with segments expanded into the chambers.

Jiagouceras is found in the Wanwankou member of the Fengshan formation (Early, Middle and Upper Trempealeauan) in northern Anhui, China. It is similar to Paraplectronoceras except for having more strongly expanded siphuncular segments and less concave septa.

References

• Chen Jun-yuan et al., 1979 Late Cambrian Cephalopods of North China -- Plectronocerida, Protactinocerida (Ord Nov) and Yanhecerida (Ord Nov)
• Chen, J. Y.; Teichert, C. (1983). "Cambrian cephalopods". Geology. 11 (11): 647–650. Bibcode:1983Geo....11..647J. ISSN 0091-7613. doi:10.1130/0091-7613(1983)11<647:CC>2.0.CO;2. 
• Teicher, C. 1988. Main Feature of Cephalopod Evolution. in The Mollusca, volume 12, Paleontology and Neontology of Cephalopods. Clark and Trueman (eds). Academic Press.
• Paleobiology DB - Jiagouceras