An oblique dusky bar on the cheek and white pelvic fins (on adults) help distinguish this species from similar members of the genus, in addition to its Indian Ocean and Red Sea distribution. A. leucogaster overlaps in distribution in the eastern Indian Ocean and western Indonesia, but has a much more distinct black spot at the base of the pectoral fin, and typically yellow pelvic fins on adults. 

• Max Size: 8 cm
• Sea Temperature Range: 21.0-33.0°C

• IUCN Threat Status: Not Evaluated
• Occurrence: Widespread (74% of sites)
  Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed
• Abundance: Many (23 per transect)
  Abundance is calculated as the average number of individuals recorded per RLS transect, where present.