Key to New Guinea Polyrhachis Cyrtomyrma

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This worker key is based on: Kohout, R. J. 2006b. Review of Polyrhachis (Cyrtomyrma) Forel (Hymenoptera: Formicidae: Formicinae) of Australia, Borneo, New Guinea and the Solomon Islands with descriptions of new species. Memoirs of the Queensland Museum. 52:87-146.

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1

  • Pronotal humeri in dorsal view toothed, obtusely angular, or narrowly rounded; greatest width of pronotal dorsum across, or just behind shoulders . . . . . 2
  • Pronotal humeri in dorsal view widely rounded; greatest width of pronotal dorsum at about mid-length of segment . . . . . 10

2

return to couplet #1

  • Propodeum armed with a pair of more-or-less distinct spines . . . . . 3

3

return to couplet #2

  • Pronotal humeri bilobed or produced into prominent teeth . . . . . 4
  • Pronotal shoulders angular or narrowly rounded . . . . . 5

4

return to couplet #3

  • Propodeal spines long, dorso-ventrally compressed, widely diverging and bluntly terminated (Aru Is) . . . . . Polyrhachis levior
Polyrhachis levior casent0901809 p 1 high.jpg
Polyrhachis levior casent0901809 d 1 high.jpg
Polyrhachis albertisi casent0905545 h 1 high.jpg
Polyrhachis albertisi casent0905545 p 1 high.jpg

5

return to couplet #3

  • Propodeal spines long, dorsoventrally compressed, widely diverging and bluntly terminated; lateral petiolar spines distinctly longer than dorsal pair . . . . . Polyrhachis barryi (in part - also #15)
Polyrhachis barryi 50N head CZ AntWiki.jpg
Polyrhachis barryi 40N side CZ AntWiki.jpg
  • Propodeal spines short, acute, strongly upturned . . . . . 6

6

return to couplet #5

Polyrhachis linae casent0903424 h 1 high.jpg
Polyrhachis linae casent0903424 p 1 high.jpg
Polyrhachis mondoi casent0903428 h 1 high.jpg
Polyrhachis mondoi casent0903428 p 1 high.jpg

7

return to couplet #2

Polyrhachis aruensis casent0910959 h 1 high.jpg
Polyrhachis aruensis casent0910959 p 1 high.jpg
  • Pronotal shouders angular or narrowly rounded . . . . . 8

8

return to couplet #7

  • Larger species (HL 2.09); head very broad with eyes rather flat, in full face view not reaching lateral cephalic outline (Bismarck Archipelago) . . . . . Polyrhachis ralumensis
Polyrhachis ralumensis casent0910962 h 1 high.jpg
Polyrhachis ralumensis casent0910962 p 1 high.jpg
  • Smaller species (HL <1.76); eyes convex, in full face view clearly extending beyond lateral cephalic outline . . . . . 9

9

return to couplet #8

  • Pronotal dorsum with anterior face distinctly convex in profile; propodeal declivity oblique; legs orange or light red . . . . . Polyrhachis rastellata
Polyrhachis rastellata casent0903407 h 1 high.jpg
Polyrhachis rastellata casent0903407 p 1 high.jpg
  • Pronotal dorsum with anterior face almost straight in profile; propodeal declivity virtually vertical; legs very dark reddish-brown . . . . . Polyrhachis strumosa
Polyrhachis strumosa casent0217438 h 1 high.jpg
Polyrhachis strumosa casent0217438 p 1 high.jpg

10

return to couplet #1

  • Propodeum armed with a pair of more-or-less distinct spines or tubercles . . . . . . 11

11

return to couplet #10

  • Pronotal dorsum in profile elevated, distinctly convex . . . . . 12

12

return to couplet #11

  • Lateral petiolar spines distinctly elongated; summit of pronotal dorsum only marginally higher than dorsum of mesonotum (Seram I.) . . . . . Polyrhachis goramensis
Polyrhachis goramensis casent0905541 h 1 high.jpg
Polyrhachis goramensis casent0905541 p 1 high.jpg
  • Lateral petiolar spines very short, rudimentary; summit of pronotal dorsum distinctly higher than dorsum of mesonotum . . . . . Polyrhachis integra

13

return to couplet #11

14

return to couplet #13

  • Propodeal spines well developed, dorso-ventrally compressed; pronotal humeri rounded, weakly subangular . . . . . 15
  • Propodeal spines rudimentary or present only as distinct tuberculae; pronotal humeri evenly rounded; petiole strongly transverse with dorsal spines reduced to minute denticles, lateral spines slender, widely diverging . . . . . Polyrhachis wagneri
Polyrhachis wagneri casent0906787 h 1 high.jpg
Polyrhachis wagneri casent0906787 p 1 high.jpg

15

return to couplet #14

  • Petiole with spines more-or-less subequal; propodeal spines short, strongly upturned (Bismarck Archipelago) . . . . . Polyrhachis leonidas
Polyrhachis leonidas casent0910961 h 1 high.jpg
Polyrhachis leonidas casent0910961 p 1 high.jpg
  • Petiole with lateral spines distinctly longer than dorsal spines; propodeal spines long, only weakly upturned . . . . . . Polyrhachis barryi (in part - also #5)
Polyrhachis barryi 50N head CZ AntWiki.jpg
Polyrhachis barryi 40N side CZ AntWiki.jpg

16

return to couplet #13

  • Body covered with abundant appressed and decumbent hair; propodeal spines short, upturned; lateral petiolar spines long, slender . . . . . Polyrhachis inducta
Polyrhachis inducta casent0903397 h 1 high.jpg
Polyrhachis inducta casent0903397 p 1 high.jpg
  • Body with only sparse appressed hair; propodeal spines very short or present as mere denticles or tuberculae; petiolar spines subequal . . . . . Polyrhachis debilis
Polyrhachis debilis casent0905544 h 1 high.jpg
Polyrhachis debilis casent0905544 p 1 high.jpg

17

return to couplet #10

  • Petiole virtually parallel-sided; petiolar spines very short, rudimentary . . . . . Polyrhachis brevinoda
Polyrhachis brevinoda 50 head AntWiki.jpg
Polyrhachis brevinoda 32 side AntWiki.jpg
  • Petiole with sides dorsally diverging; petiolar spines of various configurtions, well developed . . . . . 18

18

return to couplet #17

  • Head, mesosoma and petiole distinctly, closely reticulate-punctate, opaque . . . . . 19
  • Head, mesosoma, petiole and gaster very finely shagreened, rather smooth . . . . . 20

19

return to couplet #18

  • Pronotal dorsum distinctly swollen, exceptionally high, with medially impressed longitudinal furrow along summit . . . . . Polyrhachis inflata
Polyrhachis inflata casent0903398 h 1 high.jpg
Polyrhachis inflata casent0903398 p 1 high.jpg
  • Pronotal dorsum not distinctly swollen, without longitudinal furrow on summit . . . . . Polyrhachis luctuosa
Polyrhachis luctuosa casent0905547 h 1 high.jpg
Polyrhachis luctuosa casent0905547 p 1 high.jpg

20

return to couplet #18

  • Petiole with pair of long, slender, outward- and backward-directed lateral spines, dorsal pair reduced to minute denticles; body surfaces smooth and highly polished . . . . . Polyrhachis sedlaceki
  • Petiole with lateral spines only marginally longer than dorsal pair or all spines subequal in length . . . . . 21

21

return to couplet #20

  • Body with numerous appressed and decumbent hairs . . . . . . . . . . 22
  • Body with only very sparse, short appressed hairs . . . . . 23

22

return to couplet #21

  • Larger species (HL>1.47); lateral petiolar spines distinctly longer than dorsal pair; body pubescence rather diluted (New Guinea) . . . . . Polyrhachis nomo
Polyrhachis nomo casent0903416 h 1 high.jpg
Polyrhachis nomo casent0903416 p 1 high.jpg
  • Smaller species (HL<1.40); petiolar spines subequal; body pubescence abundant (Australia, Papua) . . . . . Polyrhachis decumbens
Polyrhachis decumbens casent0106014 head 1.jpg
Polyrhachis decumbens casent0106014 profile 1.jpg

23

return to couplet #21

Polyrhachis euryala casent0217792 h 1 high.jpg
Polyrhachis euryala casent0217792 p 1 high.jpg
  • Mesosomal dorsum in profile with distinctly uneven outline . . . . . 24

24

return to couplet #23

25

return to couplet #24

  • Pronotal dorsum exceptionally high, with short, medially impressed longitudinal furrow . . . . . . Polyrhachis conspicua
Polyrhachis conspicua casent0903395 h 1 high.jpg
Polyrhachis conspicua casent0903395 p 1 high.jpg
  • Pronotal dorsum not exceptionally high, longitudinal furrow lacking . . . . . 26

26

return to couplet #25

  • Anterior face of pronotal dorsum ascending towards rather short summit in very weakly convex, almost straight line . . . . . Polyrhachis tuberosa
Polyrhachis tuberosa casent0217440 h 1 high.jpg
Polyrhachis tuberosa casent0217440 p 1 high.jpg
  • Anterior face of pronotal dorsum ascending in strongly convex line towards distinctly swollen dorsum; pronotal-mesonotal summit relatively long . . . . . Polyrhachis dorsena
Polyrhachis dorsena casent0217428 h 1 high.jpg
Polyrhachis dorsena casent0217428 p 1 high.jpg

27

return to couplet #24

  • Mesosoma in outline with pronotal dorsum strongly convex, rather swollen; propodeum relatively low . . . . . Polyrhachis hybosa
Polyrhachis hybosa casent0903396 h 1 high.jpg
Polyrhachis hybosa casent0903396 p 1 high.jpg
  • Mesosoma in outline with only weakly convex, rather low pronotal dorsum and distinctly high propodeum (Bismarck Archipelago) . . . . . 28

28

return to couplet #27

  • Eyes distinctly convex, clearly breaking lateral cephalic outline in full face view; propodeal declivity lower, weakly concave at base; petiole with anterior face almost straight and posterior face convex . . . . . Polyrhachis aporema
Polyrhachis aporema head 50-Antwiki.jpg
Polyrhachis aporema side 32-Antwiki.jpg
  • Eyes rather flat, situated well inside cephalic outline in full face view; propodeal declivity higher, virtually vertical; petiole distinctly biconvex . . . . . Polyrhachis kyawthani
Polyrhachis kyawthani casent0217433 h 1 high.jpg
Polyrhachis kyawthani casent0217433 p 1 high.jpg