Scientists estimate that about ten million species await discovery, five times the number that are already known.

Many more almost certainly await discovery.

A lot of the theoretical groundwork has already been formulated, but new insights in this area await discovery.

Evidence of exploration not containing extraterrestrial life, such as probes and information gathering devices, may also await discovery.

Currently, about 1400 species in 126 genera are described, although many taxa undoubtedly await discovery.