During embryological development, all of the following organs develop in the peritoneal cavity suspended on a mesentery, EXCEPT:

Kidney is a retroperitoneal organ.During development, some organs develop in the peritoneal cavity suspended on a mesentery called as intraperitoneal organs. They include,StomachFirst pa of duodenumJejunumIleumTransverse colonSigmoid colonLiver SpleenSome abdominal organs develop behind the peritoneum and are called retroperitoneal organs. They are,KidneysUretersSuprarenal glandsRectumRef: Grant's Dissector By Patrick W. Tank, John Charles Boileau Grant, 2012, Page 99.