Embryonic Development of Redclaw Crayfish Cherax quadricarinatus:Ⅱ.Development of Digestive System
红螯螯虾胚胎发育的研究:Ⅱ.消化系统的发生

This paper describes the genesis of the digestive system of the redclaw crayfish, Cherax quadricarinatus .The digestive system consists of three parts:fore gut,mid gut and hind gut.The fore gut and hind gut origin from the ectoderm,and the mid gut derives from the mesendodermal cell group.The fore gut begins to form at the egg nauplius stage and is made up by stomodaeum,esophagus and stomach;the mid gut genesis at the egg metanauplius stage and contains a mid gut and a pair of hepatic rudiments;the hind gut starts at the same time as the fore gut to form the protodaeum which lies in the end of it.