Key to Tetramorium of the southwestern Australian Botanical Province

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

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 * Australia
 * SWBP
 * Tetramorium

1

 * Antenna 12-segmented (introduced spp.) . . . . . 2


 * Antenna 11-segmented (native spp) . . . . . 3

2
return to couplet #1
 * Anterior margin of clypeus entire (Figure 691); smaller species (TL ≈ 2 - 2.5 mm) . . . . . . Tetramorium simillimum


 * Anterior margin of clypeus notched (Figure 692); larger species (TL ≈ 3.5 - 4.5 mm) . . . . . . Tetramorium bicarinatum

3
return to couplet #1
 * Dorsum of petiole and postpetiole smooth and shining, almost devoid of sculpture (black species) . . . . . . Tetramorium sp. JDM 522


 * At least one of the nodes with distinct sculpture (species with some colour) . . . . . 4

4
return to couplet #3
 * Propodeum unarmed or with vestigial denticles at posterior angles . . . . . . Tetramorium sp. JDM 515


 * Propodeum armed with moderately stout spines . . . . . 5

5
return to couplet #4
 * In profile, mesosoma smoothly curved, without a hint of a metanotal groove (Figure 693a); dorsum of petiolar node large and triangular in cross section (Figure 693b) . . . . . Tetramorium sp. JDM 1007


 * In profile, promesonotum gradually declining towards propodeum, not smoothly rounded (Figure 694); metanotal groove usually indicated by shallow depression or lateral indentations; dorsum of petiolar node smaller and rectangular in cross-section (e.g. Figure 695) . . . . . 6

6
return to couplet #5
 * Antennal scrobes distinctly continuing to or close to vertex of head, sculpture within scrobes often reduced to fine punctuation with longitudinal rugulae absent or vestigial (Figure 696) . . . . . 7


 * Antennal scrobes not continuing beyond eye, often indistinct; sculpture within scrobes mostly similar to rest of vertex with longitudinal rugulae distinct (Figure 697) . . . . . 10

7
return to couplet #6
 * Eye very large (ocular diameter > 0.3 x HW); eye situated behind midpoint of head (Figure 698) . . . . . . Tetramorium megalops


 * Eye smaller (ocular diameter < 0.3 x HW); eye situated at or close to midlength of head capsule (Figure 699) . . . . . 8

8
return to couplet #7
 * Brown species . . . . . . Tetramorium sp. JDM 884


 * Concolorous orange, or orange with darker head capsule . . . . . 9

9
return to couplet #8
 * Clypeus not transversely concave or with median notch; viewed from above, dorsum of node trapezoid in shape (Figure 700), the anterior margin shorter than the posterior margin, and the dorsal surface distinctly longer than broad; base of gaster usually sculptured with fine, parallel, longitudinal striolae or finely microreticulate . . . . . . Tetramorium striolatum


 * Clypeus transversely concave or with median notch; viewed from above, dorsum of node square, about as wide as long (Figure 701); base of gaster either smooth and shining or with faint, superficial microreticulation . . . . . . Tetramorium viehmeyeri

10
return to couplet #6
 * Postpetiolar dorsum smooth and shining; head, mesosoma and nodes reddish-orange, gaster and appendages yellow . . . . . . Tetramorium sp. JDM 1072


 * Postpetiolar dorsum sculptured; often bicoloured black- or brown-and-yellow, or reddishbrown-and-orange, in light coloured forms coxae nearly always darker than mesosoma (possibly two or more species involved here) . . . . . . Tetramorium impressum