Key to the Dolichoderinae genera of the southwestern Australian Botanical Province

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

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1

  • Petiole without a distinct node (Figure 32); posterior margin of clypeus a broad, even arc (Figures 184, 185) . . . . . 2
Figure 32.
Figure 184.
Figure 185.
  • Petiole with a distinct node (Figure 34), or, if node weakly indicated (Figure 33), posterior margin of clypeus elliptical or forming a shallow rectangle, with medial sector often more-or-less straight (Figures 133b, 134b) . . . . . 3
Figure 34.
Figure 33.
Figure 133b.
Figure 134b.

2

return to couplet #1

  • Gaster with five plates (tergites) on its upper surface (Figure 32); pronotum generally with erect setae; larger (≈ 3 mm); black . . . . . Technomyrmex (There is a single species present: Technomyrmex jocosus)
Figure 32.
  • Gaster with four plates on its upper surface (as in Figure 33); pronotum without setae in WA spp.; smaller (1–1.5 mm); brown or yellowish . . . . . Tapinoma
Figure 33.

3

return to couplet #1

  • Propodeal angles produced as distinct spines on the same plane as the mesosoma (Figure 35); ant red-and-black . . . . . Froggattella
Figure 35.
  • Propodeal angles usually not produced as spines (eg. Figures 36, 37), if spines present then not on same plane as the mesosoma and ant with black body . . . . . 4
Figure 36.
Figure 37.

4

return to couplet #3

  • Underside of head near mandibular insertion with a weak to well developed flange (Figures 38a); head and mesosoma usually strongly sculptured; propodeum often concave (Figure 38b) or propodeal angle produced as spines) (Figure 38c) . . . . . Dolichoderus
Figure 38a.
Figure 38b.
Figure 38c.
  • Underside of head near mandibular insertion rounded or with a ridge, but never with a flange (Figure 39); head and mesosoma at most with very weak shagreenate sculpture; propodeum usually rounded, may be concave but never with spines . . . . . 5
Figure 39.

5

return to couplet #4

  • Palps very short (PF 2,2) (Figure 40); eyes small (about 50 facets); clypeus with several to many downwardly curved setae which are about the same length as the closed mandibles . . . . . Arnoldius (formerly Bothriomyrmex)
Figure 40.
  • Palps longer (PF 6,4 or 5,3) (see Figure 39); eyes generally larger (50 facets >); clypeus (except Nebothriomyrmex) with several to many short, occasionally curved setae, which are much shorter than the closed mandibles . . . . . 6
Figure 39.

6

return to couplet #5

  • Declivitous face of propodeum concave (Figure 41); head and mesosoma usually dull black, gaster often shiny with purple or blue iridescence, very rarely with red head and mesosoma, black gaster; nearly always associated with wood or man-made structures . . . . . Ochetellus
Figure 41.
  • Declivitous face of propodeum never concave, propodeum usually rounded, occasionally flattened or square (Figures 42, 43); often brown, black or bicoloured, appearance rarely as above; most species ground nesting . . . . . 7
Figure 42.
Figure 43.

7

return to couplet #6

  • Mesosoma consisting of three compact segments, the two thoracic segments higher than long with the propodeum often obliquely flattened; petiolar node a small to minute scale, sometimes barely visible (ant very Tapinoma like) (Figure 37); small to minute species (≈ 1–1.5 mm) . . . . . 8
Figure 37.
  • Mesosoma not so compact, the propodeum in particular broader, at least as high as long, and generally rounded or square; petiolar node more robust (see Figures 42, 43); most species of at least medium size (2–5 mm) . . . . . 9
Figure 42.
Figure 43.

8

return to couplet #7

  • Pronotum rising abruptly at approximately 90° to form a small protuberance (Figure 44); eyes small (≈ greatest width of antennal scape) . . . . . Nebothriomyrmex (There is a single species present: Nebothriomyrmex majeri)
Figure 44.
  • Pronotum moderately to strongly convex but not rising abruptly to form a protuberance (Figure 45); eyes large (2 × greatest width of antennal scape ≥) . . . . . Doleromyrma
Figure 45.

9

return to couplet #7

  • Palps shorter (PF 5,3); propodeum square in shape, sometimes with small lip anteriad (Figure 43); odour of fresh specimens aromatic (like perfume); colony often covers its nests and trails with frass (plant fibres, chewed up wood fragments and faeces) . . . . . Papyrius
Figure 43.
  • Palps longer (PF 6,4); propodeum at least gently rounded (Figure 42); fresh specimens either without odour or with strong acrid or chemical odour, rarely that of perfume; colonies do not use frass . . . . . 10
Figure 42.

10

return to couplet #9

  • Anterior margin of clypeus with central protuberance (lacking in one black, iridescent species with a low broad node and propodeal spiracles placed at the propodeal angles); eyes placed rather high on sides of head capsule (about the mid-point) (Figure 46) . . . . . Iridomyrmex
Figure 46.
  • Anterior margin of clypeus without a central protuberance, either broadly convex, straight or broadly concave; eyes placed below mid-point of head capsule (Figures 47, 48) . . . . . 11
Figure 47.
Figure 48.

11

return to couplet #10

  • Outline of mesosoma smooth except for gently rounded propodeum (Figure 49); widest point of head capsule above eye; posterior margin of head capsule slightly concave or straight (Figure 47); brown ants; little or no odour; exotic tramp species found mostly in highly disturbed environments . . . . . Linepithema (There is a single species present: Linepithema humile)
Figure 49.
Figure 47.
  • Outline sinuate (strongly rounded propodeum and usually also mesonotum) (Figure 50); widest point of head capsule near eye; posterior margin of head capsule moderately to strongly concave (Figure 48); black ants; strong chemical odour; native species found in woodland . . . . . Anonychomyrma
Figure 50.
Figure 48.