Wikipedia
Jangziceras
Jangziceras is a genus of fossil nautiloid cephalopods from the Middle Silurian of southern China belonging to the Orthocerida incertae sedis, its familial association undetermined. The type is Jangziceras sichuanense Lai Chai-Geen . Its description falls within the characters of the Orthocerida.
Jangziceras sichuanense was found in the Middle Silurian ( Telychian) Lojoping Formation in Szechuan and Kweichow Provinces associated with orthoderids such as Sichuanaceras and Neosichuanoceras and oncocerids such as Oocerina and Guangyuanoceras among other nautiloid genera in reefal environments