Some mature members of this species are only 7.9 mm long, aww. But it is depressingly inevitable that their habitat in Southeast asia is threatened so they might not be around for much longer.
Paedocypris, a new genus of Southeast Asian cyprinid fish with a remarkable sexual dimorphism, comprises the world’s smallest vertebrate. Proceedings: Biological Sciences. In press. http://www.journals.royalsoc.ac.uk/link.asp?id=y0g7834174u82404 (featured article available free for a limited period)