''Roa rumsfeldi'' is a species of marine ray-finned fish, a

butterflyfish The butterflyfish are a group of conspicuous tropical marine fish of the family Chaetodontidae; the bannerfish and coralfish are also included in this group. The approximately 129 species in 12 genera are found mostly on the reefs of the Atlant ...

belonging to the family Chaetodontidae. It is the fifth known species of the genus '' Roa'' and was discovered in Anilao, Philippines in 2016. This species has vertical white and brown stripes and has a black spine on the ventral fin contrary to the other ''Roa'' specimens.

Etymology

The specific name honours the former US Secretary of Defense

Donald Rumsfeld Donald Henry Rumsfeld (July 9, 1932 – June 29, 2021) was an American politician, government official and businessman who served as Secretary of Defense from 1975 to 1977 under president Gerald Ford, and again from 2001 to 2006 under Presi ...

, because his quote “there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns – the ones we don’t know we don’t know” applies to the describers view on what is known about

mesophotic A Mesophotic coral reef or mesophotic coral ecosystem (MCE), originally from the Latin word ''meso'' (meaning middle) and ''photic'' (meaning light), is characterised by the presence of both light-dependent coral and algae, and organisms that can b ...

fish species.

References

Marine fish of Southeast Asia Chaetodontidae Fish described in 2016 Fish of the Philippines Taxa named by Bart Shepherd Taxa named by Luiz A. Rocha Taxa named by Hudson T. Pinheiro {{Chaetodontidae-stub