Syscia Roger, 1861

Du, Congcong, Xu, Zhenghui & Chen, Zhilin, 2024, Taxonomic account of the ant genus Syscia Roger, 1816 (Hymenoptera, Formicidae) from Asia, with descriptions of two new species from China, European Journal of Taxonomy 930, pp. 157-181 : 160-161

publication ID	https://doi.org/ 10.5852/ejt.2024.930.2491
publication LSID	lsid:zoobank.org:pub:8FAF9EED-F707-4407-9885-2E571DB89F32
DOI	https://doi.org/10.5281/zenodo.10932249
persistent identifier	https://treatment.plazi.org/id/2D2D879A-FFB5-FC5E-F65E-F960FAADFAFF
treatment provided by	Plazi
scientific name	Syscia Roger, 1861
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Genus Syscia Roger, 1861

Key to Asian species of Syscia Roger, 1861 based on the worker caste

1. Antennae with 9 segments ( Figs 9A View Fig , 10D View Fig ) ....................................................................................... 2

– Antennae with 11 segments ( Figs 2C View Fig , 3A View Fig , 4D View Fig , 5A View Fig , 7A View Fig ) .................................................................. 3

2. Mesosoma rather elongate, long-ellipsoidal, with lateral sides and anterior margin obviously convex in dorsal view ( Fig. 9C View Fig ); both anterior margin and posterior margin of petiole convex in lateral view ( Fig. 9D View Fig ); posteroventral corner of subpetiolar process blunt rounded in lateral view ( Fig. 9D View Fig ); postpetiole in dorsal view longer than wide ( Fig. 9C View Fig ) ..................................... S. typhla Roger, 1861

– Mesosoma rather robust, subrectangular with almost parallel lateral sides, and anterior margin slightly convex in dorsal view ( Fig. 10C View Fig ); both anterior margin and posterior margin of petiole straight in lateral view ( Fig. 10D View Fig ); posteroventral corner of subpetiolar process acute angled in lateral view ( Fig. 10D View Fig ); postpetiole in dorsal view wider than long ( Fig. 10B View Fig ) ....... S. zhoui sp. nov.

3. Head in full-face view oval ( Figs 2A View Fig , 8B View Fig ) ....................................................................................... 4

– Head in full-face view rectangular or trapezoidal ( Figs 3B View Fig , 4A View Fig , 5A View Fig , 6A View Fig , 7A View Fig , 8B View Fig ) .......................... 5

4. Body entire reticulate, with deep bottoms ( Fig. 8 View Fig ) ............................................................................. ....................................................... S. reticularis reticularis Jaitrong Wiwatwitaya & Yamane, 2020

– Body covered with punctures or shallow fovea ( Fig. 2 View Fig ) ................................... S. arcodorsa sp. nov.

5. Petiole in dorsal view broader than long ( Fig. 3C View Fig ); in lateral view the front and the back margins of the petiole vertical ( Fig. 3A View Fig ) .............. S. chaladthanyakiji Jaitrong, Wiwatwitaya & Yamane, 2020

– Petiole in dorsal view longer than broad or as long as broad ( Figs 4C View Fig , 5B View Fig , 6B View Fig , 7B View Fig ); in lateral view the front and the back margins of petiole steep or sloped ( Figs 4D View Fig , 5D View Fig , 6C View Fig , 7C View Fig ) ............................ 7

6. Subpetiolar process in lateral view subtriangular ( Fig. 4C View Fig ); anterior margin of petiole slightly convex ( Fig. 4D View Fig ) ................................................................................................. S. humicola (Ogata, 1983)

– Subpetiolar process in lateral view subrectangular ( Figs 5D View Fig , 6C, 6B View Fig , 7C View Fig ); anterior margin of petiole slightly concave ................................................................................................................................ 7

7. Propodeal declivity straight or slightly convex in lateral view ( Figs 6–7 View Fig View Fig ) ......................................... ................................................................................................................. S. guizhouensis comb. nov.

– Propodeal declivity slightly concave in lateral view ( Fig. 5 View Fig ) ............................................................. .............................. S. indica Aswaj, Sahanashree, Udayakantha, Aniruddha & Priyadarsanan, 2021