Key to Carebara pygmaea species group of Thailand

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Key to species of the Carebara pygmaea species group known from Thailand based on major worker. Modified from Wimolsuthiku et al. (2024). See key to minor workers below.

1

  • In dorsal view, posterior half of head and entire gastral tergite I without both erect and decumbent hairs (Fig. 10A) => Carebara pygmaea
  • In dorsal view, posterior half of head and entire gastral tergite I with dense or sparse erect or decumbent hairs (Figs. 1A, 3A, 6A, 8A) => 2
  • Wimolsuthiku et al. (2024), FIGURE 10. Carebara pygmaea, non-type major worker (THNHM-I-2013-05969). A, Body in profile view; B, head in fullface view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 1. Carebara adisaki, holotype major worker (THNHM-I-27491). A, Body in profile view; B, head in full-face view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 3. Carebara bokorensis, non-type major worker (THNHM-I-00028081). A, Body in profile view; B, head in full-face view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 6. Carebara panhai, holotype major worker (THNHM-I-14191). A, Body in profile view; B, head in full-face view; 3C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 8. Carebara parva, holotype major worker (THNHM-I-14199). A, Body in profile view; B, head in full-face view; C, body in dorsal view.

2

  • Posterior one-third of head in full-face view with dense foveae, without transverse striation (Fig. 1B); gastral tergite I punctate (Fig. 3C) => Carebara bokorensis
  • Posterior one-third of head in full-face view with transverse striation (Figs 4B, 6B, 8B); gastral tergite I smooth and shiny, at most weakly shagreened (Figs. 1C, 6C, 8C) => 3
  • Wimolsuthiku et al. (2024), FIGURE 1. Carebara adisaki, holotype major worker (THNHM-I-27491). A, Body in profile view; B, head in full-face view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 3. Carebara bokorensis, non-type major worker (THNHM-I-00028081). A, Body in profile view; B, head in full-face view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 4. Carebara bokorensis, ergatoid queen (THNHM-I-00028220). A, Body in profile view; B, head in full-face view; 2C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 6. Carebara panhai, holotype major worker (THNHM-I-14191). A, Body in profile view; B, head in full-face view; 3C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 8. Carebara parva, holotype major worker (THNHM-I-14199). A, Body in profile view; B, head in full-face view; C, body in dorsal view.

3

  • Mesosomal dorsum with erect hairs (Fig. 6A) => Carebara panhai
  • Mesosomal dorsum without erect hairs (Figs. 1A, 8A) => 4
  • Wimolsuthiku et al. (2024), FIGURE 6. Carebara panhai, holotype major worker (THNHM-I-14191). A, Body in profile view; B, head in full-face view; 3C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 1. Carebara adisaki, holotype major worker (THNHM-I-27491). A, Body in profile view; B, head in full-face view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 8. Carebara parva, holotype major worker (THNHM-I-14199). A, Body in profile view; B, head in full-face view; C, body in dorsal view.

4

  • Propodeal spines shorter than diameter of propodeal spiracle; first gastral tergite with erect hairs only along its posterior margin (Fig. 1A) => Carebara adisaki
  • Propodeal spine almost as long as or slightly longer than diameter of propodeal spiracle; entire first gastral tergite covered with erect hairs (Fig. 8A) => Carebara parva
  • Wimolsuthiku et al. (2024), FIGURE 1. Carebara adisaki, holotype major worker (THNHM-I-27491). A, Body in profile view; B, head in full-face view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 8. Carebara parva, holotype major worker (THNHM-I-14199). A, Body in profile view; B, head in full-face view; C, body in dorsal view.


Key to species of the Carebara pygmaea species group known from Thailand based on minor worker. Modified from Wimolsuthiku et al. (2024).

1

  • Propodeal dorsum entirely punctate (Fig. 5A, C) => Carebara bokorensis
  • Propodeal dorsum smooth and shiny (Figs. 2A, 7A, 9A, 11A) => 2
  • Wimolsuthiku et al. (2024), FIGURE 5. Carebara bokorensis, non-type minor worker (THNHM-I-00028204). A, Body in profile view; B, head in full-face view; 2C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 2. Carebara adisaki, paratype minor worker (THNHM-I-27500). A, Body in profile view; B, head in full-face view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 7. Carebara panhai, paratype minor worker (THNHM-I-14193). A, Body in profile view; B, head in full-face view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 9. Carebara parva, paratype minor worker (THNHM-I-14201). A, Body in profile view; B, head in full-face view; 6C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 11. Carebara pygmaea, non-type minor worker (THNHM-I-2013-05970). A, Body in profile view; B, head in fullface view; C, body in dorsal view.

2

  • Antennal scape not reaching posterior margin of head (Fig. 11B); hairs on pronotum shorter than diameter of eye (Fig. 11A) => Carebara pygmaea
  • Antennal scape reaching or extending beyond posterior margin of head (Figs. 2B, 7B, 9B); hairs on pronotum longer than diameter of eye => 3
  • Wimolsuthiku et al. (2024), FIGURE 11. Carebara pygmaea, non-type minor worker (THNHM-I-2013-05970). A, Body in profile view; B, head in fullface view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 2. Carebara adisaki, paratype minor worker (THNHM-I-27500). A, Body in profile view; B, head in full-face view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 7. Carebara panhai, paratype minor worker (THNHM-I-14193). A, Body in profile view; B, head in full-face view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 9. Carebara parva, paratype minor worker (THNHM-I-14201). A, Body in profile view; B, head in full-face view; 6C, body in dorsal view.

3

  • Propodeal junction roundly convex (Fig. 7A); antennal scape extending beyond posterior margin of head (Fig. 7B); dorsa of petiole and postpetiole each with 2–4 erect hairs (Fig. 7A) => Carebara panhai
  • Propodeal junction bluntly angulated (Figs. 2A, 9A); antennal scape reaching posterior margin of head (Figs. 2B, 9B); dorsa of petiole and postpetiole without erect hairs (Figs. 2A, 9A) => 4
  • Wimolsuthiku et al. (2024), FIGURE 7. Carebara panhai, paratype minor worker (THNHM-I-14193). A, Body in profile view; B, head in full-face view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 2. Carebara adisaki, paratype minor worker (THNHM-I-27500). A, Body in profile view; B, head in full-face view; C, body in dorsal view.
  • Wimolsuthiku et al. (2024), FIGURE 9. Carebara parva, paratype minor worker (THNHM-I-14201). A, Body in profile view; B, head in full-face view; 6C, body in dorsal view.

4

  • Peduncle of petiole punctate; PI1 240–275; larger species (HW 0.43–0.46 mm in minor worker; 1.02–1.06 mm in major worker) => Carebara adisaki
  • Peduncle of petiole smooth and shiny; PI1 160–200; smaller species (HW 0.36–0.40 mm in minor worker; 0.79–0.83 mm in major worker) => Carebara parva

References

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