Western forest robin

The initial split into multiple species within this genus is based on a review from 1999 where it, based on the phylogenetic species concept, was argued that all then recognized taxa should be considered monotypic species.[4] Of these, S. gabonensis and S. xanthogaster were formerly considered subspecies of S. erythrothorax, whereas S. saghensis was described as an entirely new species.[4] The split was not followed in Handbook of the Birds of the World, where it was described as "perhaps premature".[1] Comparably, the BirdLife Taxonomic Working Group (and consequently IUCN) recommended not following the split, as differences in plumages are relatively small, genetic sampling considered incomplete, and evidence for intergradation or parapatry is lacking.[3] Another species from this complex, S. pyrrholaemus, was described as a new species in 2008. Based on mtDNA, it is placed within S. erythrothorax sensu lato, and consequently is only a species (rather than a subspecies of S. erythrothorax) if at least some of the taxonomy recommended in 1999 is followed.[2] The genetic divergence between S. pyrrholaemus and other members of the genus is comparable to that between some other closely related species.[2]