Key to the described Syncosmetus species (based on Lopes-Andrade, 2008 and Lopes-Andrade & Grebennikov, 2015) 1 Pronotum with two pairs of strong longitudinal ridges...................................... S. yunnanensis sp. nov. - Pronotum without longitudinal ridges..................................................................... 2 2 Elytra subparallel-sided, with poorly raised longitudinal keels........................................ S. reticulatus - Elytra suboval, with well-raised longitudinal keels........................................................... 3 3 First two elytral keels diverging far from elytral base................................................ S. japonicus - First two elytral keels diverging close to elytral base......................................................... 4 4 Pronotum with surface between punctures not in high relief. Each elytron with second and third keels united at their apices.............................................................................................. S. perseus - Pronotum with surface between punctures in high relief forming longitudinal striae. Each elytron with second and third keels not united at their apices................................................................................ 5 5 Pronotum with narrow longitudinal sulcus at midline; lateral margins usually narrow. Tegmen with basal portion membranous and bearing a sclerotized longitudinal stripe; apical portion not spoon-like and bearing a small emargination....... S. stheno - Pronotum with broad longitudinal sulcus at midline; lateral margins usually broad. Tegmen with basal portion homogeneously sclerotized; apical portion spoon-like...................................................................... 6 6 Pronotum with margins visible for their entire lengths from above, coarsely crenulated; surface of longitudinal sulcus not microreticulate. Penis with lateral baculi not joined at base............................................... S. euryale - Pronotum with only the posterior portions of margins visible from above, minutely crenulate; surface of longitudinal sulcus microreticulate. Penis with lateral baculi joined at base................................................ S. medusa
Published as part of Jiang, Ri-Xin, Lopes-Andrade, Cristiano, Liu, Hao-Yi & Chen, Xiang-Sheng, 2022, An extraordinary new species of the genus Syncosmetus Sharp, 1891 (Coleoptera: Ciidae) from Yunnan, China, pp. 294-300 in Zootaxa 5214 (2) on page 299, DOI: 10.11646/zootaxa.5214.2.9, http://zenodo.org/record/7385170
{"references":["Lopes-Andrade, C. (2008) An essay on the tribe Xylographellini (Coleoptera: Tenebrionoidea: Ciidae). Zootaxa, 1832 (1), 1 - 110. https: // doi. org / 10.11646 / zootaxa. 1832.1.1","Lopes-Andrade, C. & Grebennikov, V. V. (2015) First record and five new species of Xylographellini (Coleoptera: Ciidae) from China, with online DNA barcode library of the family. Zootaxa, 4006 (3), 463 - 480. https: // doi. org / 10.11646 / zootaxa. 4006.3.3"]}