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. 1 . Figs 14.9 , 10 1915 Illaenus aff. portlocki Reed, pl. 7, figs 8,9. Material. Pygidium from Hwe Maung Beds (uppermost Katian) at Hwe Maung, Fig. 14.9 ( Reed, 1915 , pl. 7, fig. 8), GSI 11539; cranidium from Upper Naungkangyi Beds at Man Ngai, Fig. 14.10 ( Reed, 1915 , pl. 7, fig. 9), GSI 11540. Remarks. These two sclerites may not belong to the same species. The internal mould of the cranidium shows evidence of carrying raised transverse ridges anteriorly which may have been strong on the dorsal surface. The same feature is seen on Illaenus sp. 3 from Yunnan , but not enough is known of either species to prove they are the same species.