Sentence:  It was in this area, as well, that he found, among other creatures, his first "Dicynodon", one of those famous mammal-like reptiles that he called <WSD>bidentals</WSD> because they had only two tusks in the upper jaw and no teeth. 
Meaning of the word marked with <WSD> tags:  An organism that has only two teeth, especially a dinosaur of the infraorder (noshow=1).