Key to Paratrechina of the southwestern Australian Botanical Province

This worker key is based on: [[Media:Heterick 2009.pdf|Heterick, B. E. 2009a. A guide to the ants of South-western Australia. Records of the Western Australian Museum, Supplement 76: 1-206. Part 2 PDF]]

The constituent species in this key now belong to three genera: Nylanderia, Paraparatrechina, and Paratrechina

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 * Australia
 * SWBP
 * Paratrechina
 * Paraparatrechina
 * Nylanderia

1

 * Yellowish species; erect, bristly setae on head capsule confined to two pairs on margin of vertex and several pairs straddling midline (minutula species-group) . . . . . 2


 * Brown species; erect, bristly setae well distributed on head capsule . . . . . 3

2
return to couplet #1
 * Eye elliptical, moderate in size (Eye length < 1/3 head length) (Figure 378); brownish-yellow species . . . . . Paraparatrechina minutula
 * Eye slightly asymmetrical (as in Iridomyrmex hartmeyeri group), larger (Eye length ≈ 1/3 head length) (Figure 377); depigmented yellow . . . . . Paraparatrechina minutula group sp. JDM 916

3
return to couplet #1
 * Antennal scapes very long, exceeding vertex of head capsule by 2/3 their length (Figure 380); eye large (eye length ≥ 1/3 length of head capsule) (introduced to SWBP) . . . . . Paratrechina longicornis


 * Antennal scapes much shorter, exceeding vertex of head capsule by ≤ 1/2 their length (Figure 381); eye smaller (eye length ≤ 1/4 length of head capsule) (introduced to SWBP) . . . . . 4

4
return to couplet #3
 * Mesopleuron lacking distinct pubescence, appressed setae, if present, very few in number (Figure 382) . . . . . Nylanderia glabrior


 * Mesopleuron uniformly covered with pubescence (Figure 383) . . . . . Nylanderia cf. obscura (ANIC SOS sp. 3)