Key to Australian Mayriella Species

The following key to Australian Mayriella is based on Shattuck and Barnett (2007) and Shattuck (2007).

1. In dorsal view, anterior region of outer margin of postpetiole expanded laterally compared to posterior regions so its overall outline is trapezoidal => 2

-. In dorsal view, outer margins of postpetiole approximately the same width anteriorly as posteriorly so its overall outline is cylindrical or slightly barrel-shaped => 3

2. Dorsum of postpetiole with more than four erect hairs and dorsum of gaster with numerous erect hairs; dorsum of petiole in lateral profile uniformly convex and without distinct, separate dorsal and posterior faces => Mayriella ebbei

-. Dorsum of postpetiole with at most four erect hairs and dorsum of gaster generally lacking erect hairs (rarely hairs present); dorsum of petiole in lateral profile angular and with distinct, separate dorsal and posterior faces => Mayriella spinosior

3. Sculpturing in posterior section of antennal scrobe at most weakly developed and always indistinct; sculpturing on dorsal mesosoma consisting of small, widely spaced pits (separated by greater than their diameter) => Mayriella overbecki

-. Sculpturing in posterior section of antennal scrobe well developed and distinct; sculpturing on dorsal surface of mesosoma consisting of large, closely spaced pits (separated by less than their diameter) => 4

4. Dorsum of petiole in lateral profile strongly angular, the dorsal and posterior faces indistinguishable => Mayriella abstinens

-. Dorsum of petiole in lateral profile with an obtuse angle, the dorsal and posterior faces separated by an angle => Mayriella occidua