Additional notes from David Bree's comments to this gallery:

This species has yellow terminal addendages that this looks like it
has though the picture is not clear at this place. Interestingly the
end of the abdomen narrows abrubtly which no adult clubtail shows.
This being a newly emerged individual I imagine it has not finished
pumping up its abdomen and the last segment, furthest from the thorax,
has not yet expanded properly.