Revision of F. R. C. Reed’s Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China Author Fortey, Richard A. Department of Earth Sciences, Museum of Natural History, Cromwell Road, London, SW 7 5 BD, UK. Author Wernette, Shelly J. Department of Earth and Planetary Sciences, University of California, Riverside, CA 92521, USA. & Department of Geography and Environmental Studies, Texas State University, San Marcos, TX 78666, USA Author Hughes, Nigel C. text Zootaxa 2022 2022-07-08 5162 4 301 356 journal article 93239 10.11646/zootaxa.5162.4.1 7d343017-483e-43be-9439-d06e748fc54e 1175-5326 6810290 DD2279FA-E8F1-4951-A5CA-91082E875580 Illaenus sp. 2 Figs 14.8 , 11 1917 Illaenus aff. schmidti Nieszkowski 1857 ; Reed p. 46–7, pl. 7, figs 12,13. Material. Incomplete cranidium, Fig. 14.11 ( Reed, 1917 , pl. 7, fig. 13), GSI 11902; pygidium, Fig. 14.8 ( Reed, 1917 , pl. 7, fig. 12), GSI 11901. Both specimens from Shihtien Formation (Darriwilian) at Banpo Village in Shidian County, Baoshan Prefecture, western Yunnan . Remarks. This species is represented by an apparently crushed incomplete internal mould of a cranidium, and a pygidium in relief, also lacking the dorsal cuticle. The pygidium has broken to show the upper surface of the doublure, which is wide (sag.) and extends as far as the tip of the acutely triangular, short pygidial axis. A patch of the lower surface of the doublure with terrace ridges is also visible. This structure is typical of Illaenus sensu stricto , but little more can be said about this species.