Referring to the western variety of Melithreptus lunatus C&B state (p.189) that “This form is readily distinguishable from eastern lunatus in size, bill shape and eye skil colour, although less so than the differences that distinguish M. gularis and M. laetior.” I’m happy with the recognition of the Swan River Honeyeater as a distinct species. But what of the Black-chinned/Golden-backed Honeyeater? If the differences between the two forms are greater than those between M. lunatus and M. chloropsis then why aren’t they split too?
Perhaps it is that while lunatus and chloropsis are separated by more than 1000 km the Black-chinneds occupy an unbroken stretch of territory so perhaps there are intermediate forms. However, C&B don’t mention this, stating only that “The taxonomy … is still unresolved. … More specimens and molecular studies are needed before a change is made to the treatment in C&B 1994.”
The IOC world bird list doesn’t separate them. Does anyone know what the latest findings are?
Jim Sneddon ===============================
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Between gularis and laetior there is a broad band of intermediate forms. Also they are quite close genetically on testing.
The other weird result was albogularis, which has poluations which have diverged earlier than the brevirostris/gularis split.
PS: I can share this paper (toon et al), if anyone wants to read it Cheers Cas