Superficially similar to the Scarce Chaser, Black-tailed Skimmer (Orthertrum cancellatum) is actually in a different genus, of which three species occur in Belgium. It can be told apart by its longer, more narrow body and emerald eyes. Keeled Skimmer is yet another formerly scarce species which seems to be rapidly colonising Brussels, whilst Southern Skimmer is still a rarity found only in the very south of the country.
