Nils Hjalmar Odhner, 1940
More than that, they are the most extreme example of the pull of the Recent, which is a term in palaeontology. All fossil groups have a first and last appearance in the fossil record but, for living species, their last appearance is the present day. This may be very much later than their last appearance as a fossil. The discovery of the living monoplacs extended their time range by 400 million years.
- meaning 'bearing one plate
- Hallam A. and Wignall P.B. 1997. Mass extinctions and their aftermath. Oxford University Press, Oxford.