The Editorial Board thanks the following external reviewers:
Paul Berry
Laura Clavijo
Cédric Dentant
John Dransfield
Len Ellis
Roy Gereau
Michael Grayum
Werner Greuter
Christine Habashi
Terry Hedderson
Sigrid Liede-Schumann
Andréa Onofre De Araujo
Sylvain Razafimandimbison
Ricarda Riina
George Schatz
Ulf Swenson
James Tregear
Daniel Thomas
Peter Weston
Paul Wilkin
John Wood
Sue Zmartzy