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A shiny blue-black unidentified weevil, perhaps 3cm TL.
Spotted on vegetation along a survey transect in secondary coastal lowland mixed freshwater swamp forest/sago swamp forest.
This specimen made a great effort to elude the photographer.
Was able to track it further down to possibly
= Aporhina nitens (Snellen van Vollenhoven. 1866)
Key was old (1896), and several spp. described afterwards.
I have just invented the "common name" - the group had none yet!
Your weevil belongs in a small, ancient relict group of weevils (Eurhynchidae), characterized by straight antennae (like Brentidae) with a long, furry club (unlike Brentidae, in wich they are merged by some taxonomists).
They are found in Australia, and New Guinea exclusively.