The middle part of the alimentary canal, including (in vertebrates) the small intestine.
- There was spiraling of the bowel around the midgut mesentery and the midgut was dusky in color.
- The reproductive system is anatomically simple, and it seems that the two ovaries derive nutrition directly from the midgut, a feature also seen in freshwater chaetonotoid gastrotrichs.
- These grow inward and eventually fuse to form the endoderm of the midgut, while ectoderm is dragged inward behind them at each end to form the foregut and the hindgut.
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