Key to Polyrhachis 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]]

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 * Australia
 * SWBP
 * Polyrhachis

1

 * Humeral angles of pronotum armed with sharp spines, directed anteriad at angle of 45° (Figure 384) (subgenus Chariomyrma) . . . . . Polyrhachis aurea sp. A (JDM 807)


 * Humeral angles of pronotum armed with, at most, a pair of short, laterally directed denticles (e.g. Figure 385) . . . . . 2

2
return to couplet #1
 * Node armed with two long, downwardly curved lateral spines only (Figure 386a); dorsum of node flat; in dorsal view, propodeum armed with two long, sinuate, cylindrical spines extending slightly beyond sides of ant when viewed dorsally (Figure 386b) (subgenus Hagiomyrma) . . . . . Polyrhachis ammonoeides


 * Node usually with four denticles or short spines (if middle pair obsolete or vestigial, then dorsum of node a thin scale) (e.g. Figure 387); propodeum either unarmed, or armed with short, upturned flanges, denticles or short, flattened spines (e.g. Figure 388) (subgenus Campomyrma) . . . . . 3

3
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 * Dorsum of node with weak denticles or angles, or dorsal margin entire . . . . . 4


 * Dorsum of node with pair of distinct spines or sharp denticles . . . . . 8

4
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 * Gaster yellow, contrasting with black head and mesosoma; smaller (HW ≈ 1 mm) . . . . . Polyrhachis (Campomyrma) sp. JDM 670


 * Head, mesosoma and gaster entirely or predominantly black or dark brown; larger species (HW ≥ 1.5 mm) . . . . . 5

5
return to couplet #4
 * Pronotum rounded, or with vestigial humeral angles; mesonotum rounded anteriad, strongly tapering towards junction with propodeum (Figure 389a); distance between frontal carinae broad, 1/3 HW >; head capsule without trace of angle between upper margin of eye and vertex (e.g. (Figure 389b) . . . . . Polyrhachis femorata


 * Pronotum and mesonotum distinctly angulate anteriad, mesonotum tapering weakly towards junction with propodeum (e.g. Figure 390); distance between frontal carinae narrow, 1/3 HW<; head capsule with dull to sharp angle between upper margin of eye and vertex (Figure 391) . . . . . 6

6
return to couplet #5
 * Angle between posterior margin of eye and vertex of head capsule strongly carinate, the upper gena slightly excavate (Figure 392a); lateral margins of node armed with sharp teeth, directed posteriad (Figure 392b) . . . . . Polyrhachis schwiedlandi


 * Angle between posterior margin of eye and vertex of head capsule usually not strongly carinate; or, if strongly carinate, then teeth on lateral margins of node vestigial and directed laterad . . . . . 7

7
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 * Propodeal angles terminating in short, upturned denticles; viewed dorsally, mesosoma with finely striate sculpture only, that on pronotum usually in form of distinct whorl (Figure 393) . . . . . Polyrhachis (Campomyrma) sp. JDM 1010


 * Rear of propodeum terminating in shelf, slightly lobate at angles; viewed dorsally, mesosoma with traces of superficial pits in addition to finely striate sculpture; sculpture of pronotum not in form of whorl (Figure 394) . . . . . Polyrhachis (Campomyrma) sp. JDM 805

8
return to couplet #3
 * Few to many erect and semi-erect setae on first gastral tergite (may be short) . . . . . 9


 * First gastral tergite lacking erect and semi-erect setae . . . . . 12

9
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 * Head and mesosoma covered with long, slightly curved, erect setae; downy pubescence present on gaster; appearance non-gracile with short appendages . . . . . Polyrhachis hirsuta


 * Head and mesosoma with sparse, short, straight setae; downy pubescence absent from gaster; gracile appearance with long appendages . . . . . 10

10
return to couplet #9
 * Lateral pair of spines on petiolar node shorter than dorsal pair and directed laterad (Figure 395) . . . . . Polyrhachis gravis


 * Lateral pair of spines on petiolar node longer than dorsal pair, and directed vertically (Figure 396) . . . . . 11

11
return to couplet #10
 * Propodeum only slightly longer than wide; flattened; sculpture of mesosoma often coarse (Figure 397) . . . . . Polyrhachis macropus


 * Propodeum much longer than wide; gently excavate towards its centre; sculpture of mesosoma a uniform, very fine microreticulation (Figure 398) . . . . . Polyrhachis pyrrhus

12
return to couplet #8
 * Gaster covered in fine pubescence . . . . . 13


 * Gaster lacking fine pubescence . . . . . 14

13
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 * In dorsal view, pronotum, mesonotum and propodeum of uniform appearance; propodeal spines short to very short and weakly upturned . . . . . Polyrhachis phryne


 * In dorsal view, mesonotum and propodeum irregularly sculptured, while pronotum is more-or-less longitudinally striate; propodeal spines long and strongly upturned . . . . . Polyrhachis (Campomyrma) sp. JDM 118

14
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 * Smaller species (HW ≈ 1 mm); lateral processes of node weak denticles . . . . . Polyrhachis (Campomyrma) sp. JDM 802


 * Larger species (HW ≥ 1.5 mm); lateral processes of node usually strong denticles or spines, if weak, ant large (HW ≥ 2 mm) . . . . . 15

15
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 * In full-face view, angles of vertex in form of small boss or protuberance just above each eye (Figure 399a); lateral spines on node distinctly longer than pair of spines on dorsum of node (Figure 399b) . . . . . Polyrhachis leae


 * In full-face view, angles of vertex not protuberant (Figure 400); lateral spines on node the same size or smaller than pair of spines on dorsum of node (Figure 401) . . . . . 16

16
return to couplet #15
 * In dorsal view, vertex of head capsule without fine, microscopic microreticulation, vertex shining in appearance . . . . . Polyrhachis ops


 * In dorsal view, vertex of head capsule with distinct microreticulate sculpture, vertex more dull in appearance . . . . . 17

17
return to couplet #16
 * In dorsal view, mesonotum distinctly wider than long (Figure 402a); propodeal angles directed upwards as weak denticles; in profile, spines on dorsum of node directed upward (Figure 402b) . . . . . Polyrhachis sidnica complex sp. JDM 390


 * In dorsal view, mesonotum about as wide as long; propodeal angles directed upward as flattened spines (Figure 403a); in profile, spines on dorsum of node tilted posteriad (Figure 403b) . . . . . Polyrhachis sidnica complex sp. JDM 671