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Necturus Small Intestine, 400X c.s.
Necturus is a genus of aquatic salamanders endemic to the eastern United States and Canada. They are commonly known as waterdogs and mudpuppies. The common mudpuppy (N. maculosus) is probably the best-known species. As an amphibian with gill slits, it is often dissected in comparative anatomy classes. The anterior part of the small intestine is about one inch in length. It receives the openings of the bile and pancreatic ducts. The duodenum continues posteriorly for a short distance and then turns forward and to the right to join the next part of the intestinal tract.