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From Hsu F-C et al. (2017): Workers of Stigmatomma luyiae can be distinguished from those of other Stigmatomma species by the combination of the following characters (asterisks flag putative unique characters within Stigmatomma):
1. Eleven antennomeres.
2. Mandibles as long as the head (MI: 100).
3. Mandibles’ baso-masticatory margin with a single row of teeth.
4. Mandibles with longer, jigsaw-tab-shaped median teeth.
5. *Anterior clypeal margin flat; modified setae or tubercular cuticular projections absent.
6. Anterior portion of the median area of the clypeus with seven stout, acuminate flattened-apex setae arranged in a single transversal row.
7. Frontal lobes closely approximated; median area of the clypeus extending posteriorly as a narrow longitudinal strip between the antennal sockets.
8. Antennal scrobe absent.
9. Genal teeth present, but minute.
10. Dorsal face of the head densely costate-foveolate, slightly catenated.
11. Head quadrate (CI: 100).
12. Mesepisternum divided into anepisternum and katepisternum.
13. Lamella absent on the ventral margin of the calcar of strigil.
14. *Anterior face of mesobasitarsus with round sulcus filled with microvilli-like projections.
15. One metatibial spur.
16. Sulcus absent on the anterior face of the metabasitarsus.
17. Fenestra absent on the subpetiolar process.
18. Stout spiniform setae absent on the hypopygium.
Stigmatomma luyiae is easily distinguished from most of its congeners in Asia due to its mandibles, which present only a single row of teeth instead of two rows. The only Stigmatomma species in that region sharing this character with the new species are those formerly classified as Bannapone (Eguchi et al., 2015): S. caliginosum (Onoyama, 1999), S. crypticum (Eguchi et al., 2015), S. fulvidum (Terayama, 1987), S. mulanae (Xu, 2000), S. pertinax (Baroni Urbani, 1978), and S. scrobiceps (Guenard et al., 2013). Within this group, S. fulvidum possesses antennae with twelve antennomeres (Terayama 1987), while the antennae of the other species, including S. luyiae, have eleven antennomeres. Only S. luyiae and S.mulanae possess the median mandibular teeth in a jigsaw tab-shaped arrangement.
The diagnostic characters for setting apart Stigmatomma luyiae from S. mulanae are the presence/absence of cuticular projections and modified setae on the anterior margin of the clypeus, head shape, and relative size of the mandibles. In S. luyiae, the anterior clypeal margin is flat and bears neither tubercular projections nor stout setae. Instead, stout, acuminate flattened-apex setae rise from the anterior portion of the median area of the clypeus. Also, the head is quadrate (CI: 100), and the mandibles are as long as the head (MI: 100). In S. mulanae, the anterior margin of the clypeus presents tubercle-like cuticular projections, and each of which bears a stout, conic seta; the head is rectangular (CI: 84; Xu 2000); and the mandibles are shorter than the head (ML: 0.30, HL: 0.38; Xu 2000).
Baroni Urbani C (1978) Contributo alla conoscenza del genere Amblyopone Erichson (Hymenoptera: Formicidae). Mitteilungen der Schweizerischen Entomologischen Gesellschaft 51: 39–51. https://doi.org/10.5281/zenodo.26795
Eguchi K, Bui TV, Yamane S, Terayama M (2015) Redefinition of the genus Bannapone and description of B. cryptica sp. nov. (Hymenoptera: Formicidae: Amblyoponinae). Zootaxa 4013(1): 077–086. https://doi.org/10.11646/zootaxa.4013.1.5
Guénard B, Blanchard B, Liu C, Yang D-R, Economo E (2013) Rediscovery of the rare ant genus Bannapone (Hymenoptera: Formicidae: Amblyoponinae) and description of the worker caste. Zootaxa 3734(3): 371–379.
Hsu F-C, Esteves FA, Chou L-S, Lin C-C (2017) A new species of Stigmatomma from Taiwan (Hymenoptera, Formicidae, Amblyoponinae). ZooKeys 705: 81-94. https://doi.org/10.3897/zookeys.705.10296
Onoyama K (1999) A new and a newly recorded species of the ant genus Amblyopone (Hymenoptera: Formicidae) from Japan. Entomological Science 2: 157–161.
Terayama M (1987) A new species of Amblyopone (Hymenoptera, Formicidae) from Japan. Edaphologia 36: 31–33. https://doi.org/10.5281/zenodo.24856
Xu Z-H (2000) Two new genera of ant subfamilies Dorylinae and Ponerinae (Hymenoptera: Formicidae) from Yunnan, China. Zoological Research 21: 297–302.
Found most commonly in these habitats: 1 times found in subtropical evergreen-broad-leaved forest.
Found most commonly in these microhabitats: 1 times sifted litter.
Collected most commonly using these methods: 1 times Winkler.
Elevations: collected at 770 m