from The Century Dictionary and Cyclopedia
- n. The archenteron, or gastrocœle of an embryo in the gastrula stage.
- n. In entomology, the anterior edge of the abdomen: a term used by acarologists.
Sorry, no etymologies found.
In this form, he says, the progaster is already developed, and its wall is differentiated for the first time into an animal or dermal layer (ectoblast), and into a vegetative or intestinal layer (hypoblast).
The cavity which is produced in the foetus by this curving is, in each case, the primitive gut (progaster), and its opening the primitive mouth (prostoma).
This is the primitive gut-cavity or the gastric cavity of the gastrula, progaster or archenteron.
The first and oldest organ of all these metazoa is the primitive gut (or progaster) and its opening, the primitive mouth
As in all the other animals that form an archigastrula, the whole body is nothing but a simple gastric sac or stomach; its internal cavity is the primitive gut (progaster or archenteron, Figure 1.38 g, 1.35 d), and its aperture the primitive mouth (prostoma or blastoporus, o).
I give the name of primitive gut (progaster) and primitive mouth
In this intermediate stage there are two cavities in the embryo -- the original cavity (blastocoel) which is disappearing, and the primitive gut-cavity (progaster) which is forming.