Proctodaeum Definition

Proctodaeum Sentence Examples

• The third or outermost chamber, the proctodaeum, is closed externally by the sphincter ani; the orifice is quite circular.

• The penis, and its much reduced vestige of the female, is developed from the ventral wall of the proctodaeum.

• In some parasitic Hymenoptera there is only a single the proctodaeum respectively.

• They have appeared independently in connexion with a change in the excretion of nitrogenous waste in Arachnids, Crustacea, and the other classes of Arthropoda when aerial, as opposed to aquatic, respiration has been established - and they have been formed in some cases from the mesenteron, in other cases from the proctodaeum.

• After the formation of the gastrula by epibole the larva becomes enclosed by an ectodermic test covering the whole of the original surface of the body, including the shell-gland, and leaving only a small opening at the posterior end in which the stomodaeum and proctodaeum are formed.