Its most unusual feature, however, is its dentition: it was regarded by its describers as being heterodont.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

Carcharodon is actually quite heterodont: the upper jaw teeth are wider and stouter than the lower jaw teeth, the teeth decrease markedly in size towards the corners of the mouth, and the crown of the third upper jaw tooth is short compared to its neighbours, and has.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

If you have an organism with mammary glands, we can predict it will have a complex eukaryote cell structure with organelles, ingest other organisms for nourishment, have bilateral symmetry, integument, alimentary canal, a bony head at one end with an array of sense organs, vertebrae protecting a nerve cord, jaws, ribs, four limbs during at least at some stage of life, neck, neocortex, endothermic, internal fertilization, four-chambered heart, lungs with alveoli and a muscular diaphragm, two eyes, three ear bones in each of two ears, hair or at least hair follicles at some stage of life, sebaceous glands, most will have heterodont dentition, etc. All that from teats.    From Wordnik.com.  [A New Book] Reference