Calyptomyrmex

Key to species of South-east Asian and Oceanian Calyptomyrmex based on workers

1. Hairs on head and body spatulate (noticeably narrower near the body and expanded distally and with a rounded tip, Fig. 3) … 2

-. Hairs on head and body thin (essentially the same width along entire length, or only slightly and gradually expanded distally, and with blunt tips, Fig. 14)............................................................................. 8

2. Gaster with low longitudinal striations running between the spatulate hairs (Australia)........................ fragarus

-. Gaster smooth to shallowly punctate...................................................................... 3

3. Propodeum armed with short angular teeth (Fig. 5 B)........................................................ 4

-. Propodeum unarmed (Fig. 14 B)......................................................................... 6

4. In dorsal view node of petiole much broader than long and rectangular in shape; body smaller (HW <0.82mm) (Australia)................................................................................................ fritillus

-. In dorsal view node of petiole only slightly broader than long and oval in shape; body larger (HW> 1.00mm)............ 5

5. Body larger (HW> 1.12); head longer than broad (CI <98); spatulate hairs on posterior section of head and mesonotum appressed closely to the underlying body surface; propodeal spines larger and more strongly angled (angle between faces approximately 90°) (Australia)..................................................................... sparsus

-. Body smaller (HW <1.12); head broader than long (CI> 104); spatulate hairs on posterior section of head and mesonotum rising above the underlying body surface; propodeal spines shorter and broader (angle between faces greater than 90°) (Malaysia)............................................................................................... danum

6. Hairs on head narrowly spatulate and rising well above the underlying body surface; in dorsal view node of petiole rectangular, in lateral view relatively thin; body smaller (HW <0.82mm) (Australia)..................................... taylori

-. Hairs on head broadly spatulate and appressed closely to the underlying body surface; in dorsal view node of petiole rounded, in lateral view relatively thick; body larger (HW> 0.90mm).................................................. 7

7. Posterior margin of head above the level of antennal scrobes broader, the lateral corners more angular; body larger (HW> 1.13mm); spatulate hairs broader and more rounded (Malaysia, Philippines).................................. loweryi

-. Posterior margin of head above the level ov antennal scorbed narrower and the lateral corners more rounded; body smaller (HW <1.10mm); spatulate hairs narrower and more linear (widespread).................................... beccarii

8. Gaster heavily sculptured with striations or a network of low rugae............................................. 9

-. Gaster weakly (and sometimes indistinctly) punctate........................................................ 10

9. Sculpturing on gaster consisting of a network anteriorly and striations posteriorly, the individual rugae very closely spaced; body larger (HW> 1.20mm) (Australia).............................................................. lineolus

-. Sculpturing on gaster a series of widely spaced longitudinal striations; body smaller (HW <1.00mm) (Malaysia).................................................................................................... retrostriatus

10. Propodeum lacking or essentially lacking spines or angles (although slightly convex rugae may be present near the angle) (Malaysia).......................................................................................... 11

-. Propodeum armed with short, triangular or narrow spines.................................................... 12

11. Lateral surfaces of mesosoma and dorsal surface of head with a limited number of well defined, broad rugae which are well separated; hairs on mesonotum relatively short and tending to be weakly spatulate; petiolar node in dorsal view only slightly wider than long (PetI approx. 115); body larger (HW> 1.05mm)............................................ asper

-. Lateral surfaces of mesosoma and dorsal surface of head with numerous narrow, ill-defined rugae which are more closely spaced; hairs on mesonotum relatively long and only slightly swollen distally; petiolar node in dorsal view noticeably wider than long (PetI> 130); body smaller (HW <1.05mm)................................................... ryderae

12. Setae on leading edge of scape long, about as long as scape width; propodeal spines broadly triangular; legs rugo-reticulate (Malaysia)................................................................................... sabahensis

-. Setae on leading edge of scape short, shorter than scape width; propodeal spines narrower and more spine-like; legs punctate................................................................................................... 13

13. Mesonotum and dorsal face of propodeum forming a single, continuous surface; petiolar node more upright and block-like, in dorsal view longer than broad (New Caledonia)..................................................... caledonicus

-. Mesonotum and dorsal face of propodeum separated by an angle; petiolar node leaning slightly posteriorly, the anterior face rounding into the dorsal face, in dorsal view broader than long............................................... 14

14. Rugae on dorsum of head widely spaced, the underlying punctate surface clearly visible, the rugae fading posteriorly and essentially absent near the posterior margin (Vietnam)............................................... rectopilosus

-. Rugae on dorsum of head closely spaced and largely obscuring the underlying surface, the rugae strongly developed across the entire length of the head (Australia)..................................................................... 15

15. Mesonotum rugo-reticulate but with rugae running longitudinally; propodeal spines shorter; petiolar node in dorsal view broader and thinner............................................................................. grammus

-. Mesonotum rugo-reticulate but lacking longitudinal rugae; propodeal spines longer; petiolar node in dorsal view narrower and thicker....................................................................................... ocullatus