Please, next time a biologist wants to find a name for a species of blood sucker, please think of the recording industry.
Should have been Gnathia riaaa

Its 18" long, so width is some 4". The metal piece can slide up into the wooden part, numbers on it range from 15 to 25. So non zero scale.
Primitive foot measuring device? 15-25 unit range indicates Japanese shoe. Deduce: A Japanese foot measuring device.

A Day Without Nuclear Fusion L Black

http://www.malepregnancy.com/

that is all