Key for males of Fleuronema copied from Greenslade & Nicholas (1991):

1. Mandible smaller and narrow, distance between tips of lateral apical teeth nearly twice mandible breadth, spicules strongly curved, just over 1 abd in length, cephalic setae 1,5x head diameter....................................... F. dorca

- Mandible larger and broad, with granulated surface, distance between tips of lateral apical teeth less than twice mandible breadth, spicules longer, 1,5 abd, cephalic setae shorter, <1,5 head diameter............................... F. robusta