Key to Myrmica pachei-group

Every Ant Tells a Story - And Scientists Explain Their Stories Here
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This worker key is based on: Chen, Z.L., Zhou, S.Y., Huang, J.H. 2016. Seven species new to science and one newly recorded species of the ant genus Myrmica Latreille, 1804 from China, with proposal of a new synonym (Hymenoptera: Formicidae). ZooKeys 551: 85–128 (doi: 10.3897/zookeys.551.6005).

The Myrmica fauna of China is still poorly known, and many more species certainly remain to be found.

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1

  • Basal third of first gastral tergite densely punctated and longitudinally ruguloso-striated . . . . . Myrmica sculptiventris
Myrmica sculpiventris.jpg
  • Whole surface of first gastral tergite smooth . . . . . 2

2

return to couplet #1

  • Whole mesosoma dorsum with straight transversal rugae . . . . . 3
  • Only part of mesosoma dorsum with straight transversal rugae . . . . . 5

3

return to couplet #2

  • Head distinctly elongate, suboval, with narrowly rounded posterior corners; posterior third of head dorsally without longitudinal rugae and reticulation, but densely punctuate . . . . . Myrmica yani
Chen, Z., Zhou, S., Huang, J hef.jpg
Chen, Z., Zhou, S., Huang, J hal.jpg
  • Head slightly longer than broad, subsquare, with distinctly marked posterior corners; whole head dorsally with longitudinal rugae . . . . . 4

4

return to couplet #3

  • Lateral and posterior margins of the head with long numerous suberect to erect hairs. Colour lighter, head dorsum dark reddish brown, mesosoma and gaster brownish red . . . . . Myrmica villosa
Myrmica villosa H casent0900339.jpg
Myrmica villosa P casent0900339.jpg
  • Lateral margins of head with short decumbent hairs, long suberect hairs present only on the posterior margin and genae. Colour darker, whole body dark reddish brown . . . . . Myrmica pachei
MCZ-ENT00020559 Myrmica pachei hef.jpg
MCZ-ENT00020559 Myrmica pachei hal.jpg

5

return to couplet #2

  • Lateral and posterior margins of head with long numerous suberect to erect hairs . . . . . 6
  • Lateral margins of head either glabrous or with short decumbent hairs; if long erect to suberect hairs occur, they are restricted to the posterior margin and genae . . . . . 12

6

return to couplet #5

  • Head slightly longer than broad (CI < 1.15), subsquare, with distinctly marked posterior corners . . . . . 7
  • Head distinctly elongate (CI > 1.20), suboval, with barely marked posterior corners . . . . . 9

7

return to couplet #6

  • Number of rugae between frontal carinae level with the eyes >30; mesonotal and propodeal dorsum with > 35 fine transverse rugae . . . . . Myrmica pleiorhytida
Myrmica pleiorhytida.jpg
  • Number of rugae between frontal carinae level with the eyes ≤ 25; mesonotal and propodeal dorsum fine transverse rugae < 20 . . . . . 8

8

return to couplet #7

  • Petiole with a stronger triangular ventral process; propleuron with rugose; mesonotal and propodeal dorsum with about 20 moderately coarse transverse sinuous rugae . . . . . Myrmica dongi
Chen, Z., Zhou, S., Huang, J hef.jpg
Chen, Z., Zhou, S., Huang, J hal.jpg
  • Petiole with a normal triangular ventral process; propleuron only with densely punctuated; mesonotal and propodeal dorsum with 8−10 coarse sinuous transverse rugae . . . . . Myrmica mifui
Chen, Z., Zhou, S., Huang, J hef20.jpg
Chen, Z., Zhou, S., Huang, J hal20.jpg

9

return to couplet #6

  • Mesonotal and propodeal dorsum with ≤20 coarser transverse rugae . . . . . 10
  • Mesonotal and propodeal dorsum with ≥ 25 finer transverse rugae . . . . . 11

10

return to couplet #9

  • Petiole low, PI1 1.68, its node with elongate flattened dorsum . . . . . Myrmica weii
Myrmica weii.jpg
  • Petiole higher, PI1 < 1.55, its node with short, slightly convex, gradually sloping posteriorly dorsal surface . . . . . Myrmica multiplex
Myrmica multiplex.jpg

11

return to couplet #9

  • Frontal carinae merge with the rugae that extend back to the posterior head margin. Surface of head dorsum between rugae appears shiny . . . . . Myrmica yunnanensis
Myrmica yunnanensis.jpg
  • Frontal curved outwards to merge with the rugae that surround antennal sockets. Surface of the head dorsum between rugae appears dull, coarsely and densely punctuated . . . . . Myrmica heterorhytida
Myrmica heterorhytida.jpg

12

return to couplet #5

  • Propodeal spines long (ESLI > 0.45), massive, widened at the base and often downcurved on their distal third . . . . . Myrmica taibaiensis
Myrmica taibaiensis.jpg
  • Propodeal spine shorter (ESLI < 0.40), slender and straight . . . . . 13

13

return to couplet #12

14

return to couplet #13

  • Head distinctly elongate (CI > 1.20), suboval, with barely marked posterior corners; dorsum of head posterior to eyes with reticulation, rest of head dorsum with longitudinal rugosity . . . . . Myrmica polyglypta
Myrmica polyglypta H casent0904552.jpg
Myrmica polyglypta P casent0904552.jpg
  • Head slightly longer than broad (CI < 1.15), subsquare, with distinctly marked posterior corners; only occiput and temples with fine reticulation . . . . . 15

15

return to couplet #14

  • Basal third of first gastral tergite with fine superficial hexagonal sculpture; posterior margin without any erect to suberect long hairs; dorsum of petiolar node with a distinct broad dorsal plate . . . . . Myrmica huaii
  • Whole gastral tergite smooth and shiny; posterior margin with erect to suberect long hairs; dorsum of petiolar node without a distinct broad dorsal plate . . . . . 16

16

return to couplet #15

  • Lateral margins of head posterior to eyes with abundant short decumbent hairs; Mesonotal and propodeal dorsum with > 25 moderately thin (not coarse) transverse sinuous rugae; Petiole with relatively short but distinct peduncle, its anterior surface concave, dorsum of node quite narrowly rounded . . . . . Myrmica schulzi
Myrmica schulzi.jpg
  • Lateral margins of head posterior to the eyes without short decumbent hairs; Mesonotal and propodeal dorsum with < 20 quite coarse transverse sinuous rugae; petiole low, with distinct peduncle, its anterior surface concave, dorsum of node widely rounded . . . . . Myrmica phalacra
Myrmica phalacra.jpg

17

return to couplet #13

  • Propodeal dorsum with fine longitudinal striations . . . . . Myrmica elmesi
Myrmica elmesi H casent1008040.jpg
Myrmica elmesi P casent1008040.jpg

18

return to couplet #17

  • Propodeal dorsum with transverse rugosity, mesonotal dorsum with short, broken irregular rugae and reticulation . . . . . Myrmica varisculpta
Myrmica varisculpta H casent0904555.jpg
Myrmica varisculpta P casent0904555.jpg
  • Propodeal dorsum with sinuous longitudinal rugae, mesonotal dorsum with transverse rugosity . . . . . Myrmica hlavaci
Myrmica hlavaci.jpg