A bit more detail on the proconsul teeth as I know you've been waiting with bated breath
It was the speed of the eruption of the teeth that showed that proconsul was in transition between monkey and ape. Monkey teeth erupt fast because monkeys generally lead much shorter lives that apes - maturing quicker and dying sooner. Proconsul teeth erupted faster than monkeys but not quite as fast as apes. The teeth also showed that their diet was similar to modern siamangs (lots of leaves) with evidence (I think through tooth enamel) that showed they also ate fruit like modern gibbons.