Key to Strumigenys of East Asia (as Pyramica)

This worker key is based on: Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028.

Malasian-Oriental-East Palaearctic Pyramica

Bolton noted: Strumigenys formosa of Taiwan (p. 452), known only from queens, is omitted from the key. Its workers would be expected to key out around couplets 26-27.

This key is from a study that included the now synonymized genus Pyramica. Therefore there are two sets of keys for the Strumigenys species from this region: the key found below and a Key to Strumigenys of East Asia.

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 * Strumigenys

1

 * Antenna with 4 segments; first funicular segment not separated from the 2-segmented apical club. (India, Nepal, Thailand, Malaysia (West Malaysia), Singapore) . . . . . Strumigenys nepalensis


 * Antenna with 5 or 6 segments; first funicular segment separated from the 2-segmented apical club by one or two small segments . . . . . 2

2
return to couplet #1
 * Antenna with 5 segments; first funicular segment separated from the 2-segmented apical club by a single small segment. (Malaysia (West Malaysia)) . . . . . Strumigenys gyges


 * Antenna with 6 segments; first funicular segment separated from the 2-segmented club by two small segments . . . . . 3

3
return to couplet #2
 * With head in full-face view the leading edge of the scape with a row of conspicuous projecting curved hairs, of which one or more, distal to the subbasal bend, distinctly curves toward the base of the scape. These hairs may be spatulate, remiform, spoon-shaped or broadly clavate apically; basal stem of each hair (which may be short) erect or sub erect with respect to the long axis of the scape . . . . . 4


 * With head in full-face view the leading edge of the scape lacking projecting hairs that curve toward the base of the scape. Scape edge may have elongate simple straight projecting hairs present, or entirely apically directed short hairs that may be simple, narrowly to broadly spatulate, or spoon-shaped; in some species the leading edge may be hairless . . . . . 35

4
return to couplet #3
 * With head in full-face view the dorsolateral margin with a distinctly isolated, very conspicuous, laterally projecting apicoscrobal hair; apicoscrobal hair conspicuously differentiated from other pilosity on the margin, may be simple, clavate or flagellate . . . . . 5


 * With head in full-face view the dorsolateral margin without a distinctly isolated apicoscrobal hair that is conspicuously differentiated from other pilosity on the margin; either hair absent or duplicated by others on the margin . . . . . 23

5
return to couplet #4
 * Pronotal humeral hair absent. Dorsum of pronotum densely clothed with scale-like or stud-like broad hairs. Ventral margin of petiole peduncle without a longitudinal spongiform strip from base to level of node. Base of first gastral sternite without spongiform tissue. Standing stout hairs on first gastral tergite restricted to a single transverse row of four extremely close to the base. (Malaysia (Sarawak)) . . . . . Strumigenys clotho


 * Pronotal humeral hair present, may be simple, clavate, remiform or flagellate. Dorsum of pronotum lacking scale-like or stud-like broad hairs. Ventral margin of petiole peduncle with a continuous longitudinal spongiform strip from base to level of node, even if only narrowly so. Base of first gastral sternite with spongiform tissue. Standing hairs on first gastral tergite not restricted to a single transverse row close to the base . . . . . 6

6
return to couplet #5
 * Pronotal humeral hair long and flagellate; either freely projecting, or with its apical portion looped . . . . . 7


 * Pronotal humeral hair not flagellate; either simple and shallowly curved, or narrowly clavate, or remiform . . . . . 10

7
return to couplet #6
 * Cephalic dorsum with a transverse row of 4 standing hairs immediately in front of the occipital margin, but without a similar pair in front of the highest point of the vertex. Apicoscrobal hair not flagellate . . . . . 8


 * Cephalic dorsum with a transverse row of 4 standing hairs immediately in front of the occipital margin, and with a pair of similar standing hairs just in front of the highest point of the vertex. Apicoscrobal hair flagellate . . . . . 9

8
return to couplet #7
 * Eye minute, with only 1 or 2 very small ommatidia. Mesopleuron and metapleuron, and side of propodeum, smooth and shining. (Malaysia (West Malaysia)) . . . . . Strumigenys vescops


 * Eye larger, distinctly with more than 2 ommatidia. Mesopleuron smooth but metapleuron and side of propodeum reticulate-punctate. (Marquesas Is) . . . . . Strumigenys mumfordi

9
return to couplet #7
 * Mesonotum in profile with a single pair of erect long stout hairs, situated anteriorly on the sclerite. (Malaysia (West Malaysia, Sabah), Philippines (Luzon), Indonesia (Bali, Sumatra, Sulawesi, Kai Besar, Aru), Papua New Guinea, Solomon Is, Palau Is, also present in Australia) . . . . . Strumigenys karawajewi


 * Mesonotum in profile with two pairs of erect long stout hairs, the posterior pair usually distinctly the longer. (Bhutan, China, Burma, Thailand, Malaysia (West Malaysia, Sarawak, Sabah), Philippines (Luzon), Indonesia (Kalimantan, Bali, Java, Sumatra)) . . . . . Strumigenys dohertyi

10
return to couplet #6
 * Apical (masticatory) margin of mandible finely serrate, with distinctly more than 20 small to minute denticles crowded along the margin; basal 5-7 teeth not large and not the only ones clearly visible when the mandibles are fully closed . . . . . 11


 * Apical (masticatory) margin of mandible dentate, with 1 2 teeth and denticles in total on the margin; basal 5-7 teeth relatively large and the only ones clearly visible when the mandibles are fully closed . . . . . 12