The petiolar node is evenly rounded, with the anterior and posterior faces both approximating similar curves. Used in Antkey to separate Tetramorium tonganum and Tetramorium lanuginosum from all other Tetramorium.
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith
