Key to Calyptomyrmex of Southeast Asia and Oceania

This worker key is based on: Shattuck, S.O. 2011. Revision of the ant genus Calyptomyrmex in South-east Asia and Oceania. Zootaxa. 2743:1-26.

1

Hairs on head and body spatulate (noticeably narrower near the body and expanded distally and with a rounded tip) . . . . . 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) . . . . . 8

2

return to couplet #1

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

Gaster smooth to shallowly punctate . . . . . 3

3

return to couplet #2

Propodeum armed with short angular teeth . . . . . 4

Propodeum unarmed . . . . . 6

4

return to couplet #3

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

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

5

return to couplet #4

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) . . . . . Calyptomyrmex 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) . . . . . Calyptomyrmex danum

6

return to couplet #3

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) . . . . . Calyptomyrmex 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

return to couplet #6

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) . . . . . Calyptomyrmex loweryi

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

8

return to couplet #1

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

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

9

return to couplet #8

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

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

10

return to couplet #8

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

return to couplet #10

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) . . . . . Calyptomyrmex 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) . . . . . Calyptomyrmex ryderae

12

return to couplet #10

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

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

13

return to couplet #12

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) . . . . . Calyptomyrmex 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

return to couplet #13

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) . . . . . . Calyptomyrmex 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

return to couplet #14

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

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