This taxon is Not Recognised as a species by BirdLife International.
Batrachostomus javensis (del Hoyo and Collar 2014) was previously split as B. javensis and B. affinis following Sibley and Monroe (1990, 1993). B. pygmaeus was described as new to science by Alviola (1997) but is regarded as an example of B. javensis following Holyoak (1999) and Dickinson (2003).
BirdLife International (2016) Species factsheet: Batrachostomus affinis. Downloaded from http://www.birdlife.org on 04/12/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 04/12/2016.