Jiagouceras
Encyclopedia
Jiagouceras is an early primitive cephalopod 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, middle and early upper Trempealeauan, northern Anhui, China. It is similar to Paraplectronoceras
except for having more strongly expanded siphuncular segments and less concave septa.
China
Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...
, assigned to the Plectronoceratidae. The shell is small, nearly straight with a slight endogastric curvature and compressed cross section. The siphuncle
Siphuncle
The siphuncle is a strand of tissue passing longitudinally through the shell of a cephalopod mollusk. Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the living nautiluses, cuttlefish, and Spirula...
is close to the ventral margin, with segments expanded into the chambers.
Jiagouceras is found in the Wanwankou member of the Fengshan formation, middle and early upper Trempealeauan, northern Anhui, China. It is similar to Paraplectronoceras
Paraplectronoceras
Paraplectronoceras is a very early nautiloid from the middle Late Cambrian, named by Chen and Qi, 1979, type species Paraplectronoceras pyriforme, for small, endogastrically curved forms found in the upper Yenchou and Wanwankou members of the Fengshan Formation of northeastern China.The shell of...
except for having more strongly expanded siphuncular segments and less concave septa.