It is around 11 cm in length and weighs between 6.5-8 g. The males are slightly heavier than the females. The plumage of this species also varies by sex, with the male having a scarlet head, breast and back, black wings and tail and a white belly and rump. The female has a dull brown head, breast and back with a slight red wash on the face, duller wings and belly. Juvenile birds resemble the female.
The Myzomela caledonica is classified as Least Concern. Does not qualify for a more at risk category. Widespread and abundant taxa are included in this category.
Myzomela caledonica is split from M. sanguinolentus (Higgins, Christidis & Ford 2008) 39. CHANGE: English name of Myzomela sclateri to Sclater's Myzomela (Gregory 2009) 40. CHANGE: English name of Myzomela pammelaena to Bismarck Black Myzomela (Gregory 2009) 41. CHANGE English name of Myzomela erythromelas to simpler Black-bellied Myzomela in current use (Gregory in litt. More