Key to Myrmecia of the southwestern Australian Botanical Province

Every Ant Tells a Story - And Their Stories Are Here
Jump to navigation Jump to search

This worker key 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 2 PDF

This key adapted from Ogata and Taylor (1991): readers are also referred to illustrations in that key. Note: The workerless parasite Myrmecia inquilina Douglas and Brown is not included in this key, which treats workers only.

You may also be interested in

1

  • Occipital carina present (indicated by broken lines) (Figure 441) . . . . . 2
Figure 441.
  • Occipital carina lacking (curvature of occiput indicated by dotted lines) (Figure 442) . . . . . 19
Figure 442.

2

return to couplet #1

  • Subapical portion of mandible with a supplementary ventral tooth (Figure 443) . . . . . 3
Figure 443.
  • Subapical portion of mandible without a supplementary ventral tooth (Figure 444) . . . . . 17
Figure 444.

3

return to couplet #2

  • Mandibles each with 3 enlarged teeth apart from the apical tooth (Figure 445) . . . . . Myrmecia forceps
Myrmecia forceps casent0914018 h 1 high.jpg
Myrmecia forceps casent0914018 p 1 high.jpg
Figure 445.
  • Mandibles each with 4 or more enlarged teeth apart from the apical tooth (Figure 446) . . . . . 4
Figure 446.

4

return to couplet #3

  • Mandibles medium reddish-brown to dark brown, approximately concolorous with head capsule . . . . . 5
  • Mandibles light yellowish- to reddish-brown, distinctly lighter in colour than head capsule . . . . . 6

5

return to couplet #4

Myrmecia regularis casent0217502 h 1 high.jpg
Myrmecia regularis casent0217502 p 1 high.jpg
Myrmecia erecta casent0902793 h 1 high.jpg
Myrmecia erecta casent0902793 p 1 high.jpg

6

return to couplet #4

  • Apex of gaster yellowish; scapes darker than head . . . . . 7
  • Apex of gaster blackish; scapes concolorous with, or lighter than head . . . . . 8

7

return to couplet #6

Myrmecia analis casent0914014 h 1 high.jpg
Myrmecia analis casent0914014 p 1 high.jpg
Myrmecia nigriscapa casent0217499 h 1 high.jpg
Myrmecia nigriscapa casent0217499 p 1 high.jpg

8

return to couplet #6

  • Mandibular shaft generally even in width, not narrowed basally (Figure 447) . . . . . 9
Figure 447.
  • Mandibular shaft narrow at extreme base, broadened over basal quarter to fifth of its length (Figure 448) . . . . . 11
Figure 448.

9

return to couplet #8

  • Petiolar peduncle short, at most as long as node, and not reaching the apices of the hind coxae when they are extended posteriad (Figure 449) . . . . . Myrmecia picticeps
Figure 449.
  • Petiolar peduncle longer than petiolar node; reaching or exceeding the apices of the hind coxae when they are extended posteriad (Figure 450) . . . . . 10
Figure 450.

10

return to couplet #9

  • Pronotum with erect setae shorter than those of first funicular segment . . . . . Myrmecia rubripes
  • Pronotum with erect setae longer than those of first funicular segment . . . . . Myrmecia arnoldi
Myrmecia arnoldi casent0914017 h 1 high.jpg
Myrmecia arnoldi casent0914017 p 1 high.jpg

11

return to couplet #8

12

return to couplet #11

  • Setae on head and mesosoma long and thick, those on sides near posterior corners of head extending beyond outer margins of eyes . . . . . Myrmecia fulgida
  • Setae on head and mesosoma short and thin, those on sides near posterior corners of head not extending beyond outer margins of eyes . . . . . 13

13

return to couplet #12

  • Head blackish, concolorous with gaster; mesosoma and nodes pale yellow, concolorous with mandibles . . . . . 14
  • Head dark reddish-brown to yellowish-brown, lighter than gaster; mesosoma and nodes light reddish-brown to dark brown, darker than mandibles . . . . . 15

14

return to couplet #13

Myrmecia fuscipes casent0914022 h 1 high.jpg
Myrmecia fuscipes casent0914022 p 1 high.jpg
Myrmecia desertorum casent0912436 h 1 high.jpg
Myrmecia desertorum casent0912436 p 1 high.jpg

15

return to couplet #13

  • Scape with numerous erect or suberect setae (Note: this character may be hard to see on abraded specimens) . . . . . Myrmecia nigriceps
Myrmecia nigriceps casent0217498 h 1 high.jpg
Myrmecia nigriceps casent0217498 p 1 high.jpg

16

return to couplet #15

  • Mesosoma light reddish-brown; head concolorous with mesosoma; petiolar spiracle usually situated somewhat dorsally on peduncle . . . . . Myrmecia gratiosa
Myrmecia gratiosa casent0914024 h 1 high.jpg
Myrmecia gratiosa casent0914024 p 1 high.jpg
  • Mesosoma yellowish-brown to dark brown; petiolar spiracle usually situated laterally on Peduncle . . . . . Myrmecia vindex
Myrmecia vindex casent0902796 h 1 high.jpg
Myrmecia vindex casent0902796 p 1 high.jpg

17

return to couplet #2

  • Coxae orange; femora predominantly orange tending to brown near attachment of tibiae . . . . . Myrmecia urens complex sp. JDM 728 (there are two named species from this group previously reported from the SWBP: Myrmecia nigra and Myrmecia infima but they cannot be assigned to this or the other two species from this species group [see couplet 18 just below], see discussion under the identification section of either of these species for other details)
  • Coxae dark brown; femora predominantly dark brown tending to orange near attachment of tibiae . . . . . 18

18

return to couplet #17

  • Viewed dorsally, mesosoma and node rugose and punctate (Figure 451); length of ocular setae usually < diameter of one facet . . . . . Myrmecia urens complex sp. JDM 1
Figure 451.
  • Viewed dorsally, mesosoma and node with reduced sculpture (node may be virtually smooth and shining) (Figure 452); length of ocular setae > width of one facet . . . . . Myrmecia urens complex sp. JDM 71
Figure 452.

19

return to couplet #1

  • Posterior tibial spur of hind leg a simple spine-like process (Figure 453) . . . . . Myrmecia callima
Figure 453.
  • Posterior tibial spur of hind leg distinctly pectinate (Figure 454) . . . . . 20
Figure 454.

20

return to couplet #19

  • Subapical portion of mandible with a single row of teeth (Figure 443); head bicoloured with anterior section yellow, posterior section brown to black . . . . . Myrmecia picta
Myrmecia picta casent0902806 h 1 high.jpg
Myrmecia picta casent0902806 p 1 high.jpg
Figure 443.
  • Subapical portion of mandible with a supplementary ventral tooth (Figure 444); head uniformly coloured . . . . . 21
Figure 444.

21

return to couplet #20

  • Dentition strongly developed along entire inner margin of mandible (Figure 455) . . . . . 22
Figure 455.
  • Dentition reduced or vestigial in the sub-basal portion of mandible (Figure 456) . . . . . 30
Figure 456.

22

return to couplet #21

  • Clypeal setae long, reaching at least to the basal quarter of mandibles (Figure 457) . . . . . 23
Figure 457.
  • Clypeal setae short, at most only slightly exceeding anterior clypeal margin (Figure 458) . . . . . 25
Figure 458.

23

return to couplet #22

  • Postpetiole distinctly sculptured (Figure 459); pubescence on gaster yellow . . . . . Myrmecia rugosa
Myrmecia rugosa casent0902801 h 1 high.jpg
Myrmecia rugosa casent0902801 p 1 high.jpg
Figure 459.
  • Postpetiole with at most vestigial sculpture (Figure 460); in doubtful cases, pubescence on gaster bright orange . . . . . 24
Figure 460.

24

return to couplet #23

  • Standing setae on pronotum mostly longer than first funicular segment; clypeus without yellow pubescence; mandible of more-or-less the same width throughout its length; (bright orange pubescence on gaster distinctive) . . . . . Myrmecia michaelseni
Myrmecia michaelseni casent0907087 h 1 high.jpg
Myrmecia michaelseni casent0907087 p 1 high.jpg
  • Standing setae on pronotum mostly shorter than first funicular segment; clypeus may have yellowish pubescence; mandible noticeably tapered along its length (gastral pubescence off white to yellowish in specimens seen) . . . . . Myrmecia varians
Myrmecia varians casent0902804 h 1 high.jpg
Myrmecia varians casent0902804 p 1 high.jpg

25

return to couplet #22

  • Erect setae on hind tibia abundant and long, some as long or longer than maximum width of tibia (Figure 461) . . . . . 26
Figure 461.
  • Erect setae on hind tibia sparse and short, shorter than maximum width of tibia (Figure 462) . . . . . 27
Figure 462.

26

return to couplet #25

Myrmecia chasei casent0907091 h 1 high.jpg
Myrmecia chasei casent0907091 p 1 high.jpg
Myrmecia ludlowi casent0902802 h 1 high.jpg
Myrmecia ludlowi casent0902802 p 1 high.jpg

27

return to couplet #25

  • Mesosoma essentially uniformly black; petiole black . . . . . Myrmecia sp. near Myrmecia pilosula
Myrmecia pilosula casent0217500 h 1 high.jpg
Myrmecia pilosula casent0217500 p 1 high.jpg
  • Mesosoma more-or-less uniformly light reddish to yellowish or bicoloured black-and-red; petiole yellowish to reddish brown . . . . . 28

28

return to couplet #27

  • With combination of mandibles dark brown, concolorous with head, and pubescence on clypeus whitish . . . . . Myrmecia dispar
  • Either mandibles lighter in colour, or pubescence on clypeus yellowish . . . . . 29

29

return to couplet #28

  • Pubescence of clypeus yellowish; scape not exceeding posterior border of head (and see Species Description) . . . . . Myrmecia elegans
Myrmecia elegans antweb1008282 p 1 high.jpg
  • Pubescence of clypeus whitish; scape exceeding posterior border of head by about half the length of first funicular segment (and see Species Description) . . . . . Myrmecia occidentalis
Myrmecia occidentalis casent0902803 h 1 high.jpg
Myrmecia occidentalis casent0902803 p 1 high.jpg

30

return to couplet #21

  • Clypeus with distinctly long, forwardly directed setae, reaching to about half the length of the mandibles, or further . . . . . Myrmecia mandibularis
Myrmecia mandibularis casent0907099 h 1 high.jpg
Myrmecia mandibularis casent0907099 p 1 high.jpg

31

return to couplet #30

  • Body bicoloured: head and gaster blackish-brown, mesosoma and petiole reddish . . . . . 33

32

return to couplet #31

  • Mandibles dark brown; dorsal surface of second and following gastral segments with gold pubescence . . . . . Myrmecia tepperi
Myrmecia tepperi antweb1008211 p 1 high.jpg
  • Mandibles yellowish; dorsal surface of second and following gastral segments with sparse white pubescence . . . . . Myrmecia clarki
Myrmecia clarki casent0902810 h 1 high.jpg
Myrmecia clarki casent0902810 p 1 high.jpg

33

return to couplet #31

  • Legs reddish-brown, approximately concolorous with mesosoma (often a little lighter); postpetiole usually lighter in colour than gaster . . . . . Myrmecia testaceipes
Myrmecia testaceipes antweb1008295 p 1 high.jpg
  • Legs distinctly darker brown than mesosoma; postpetiole dark in colour, concolorous with gaster . . . . . 34

34

return to couplet #33

  • Dorsal projection of labrum obtuse, broadly rounded (Figure 463) . . . . . Myrmecia swalei
Myrmecia swalei casent0914036 h 1 high.jpg
Myrmecia swalei casent0914036 p 1 high.jpg
Figure 463.
  • Dorsal projection of labrum narrow and acute (Figure 464) . . . . . Myrmecia acuta
Myrmecia acuta casent0902811 h 1 high.jpg
Myrmecia acuta casent0902811 p 1 high.jpg
Figure 464.