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 Yanhaoia Zhou, Yuan & Zhou, 1998 Type species . Pterygometopus huayinshanensis Lu, 1975 , Middle Ordovician , Neichiashan Series , Sichuan , original designation . Remarks. The generic classification of pterygometopids is not yet in a stable state. The species described below is placed in Yanhaoia because of its unusually large eyes combined with a relatively narrow axis.