Provisional checklist of freshwater fish diversity and distribution in Perak, Malaysia, and some latest taxonomic concerns Author Ng, Casey Keat Chuan Author Lim, Teow Yeong Author Ahmad, Amirrudin Author Khaironizam, Md Zain text Zootaxa 2019 2019-03-18 4567 3 515 545 journal article 28342 10.11646/zootaxa.4567.3.5 45397b0e-2315-410d-9640-3e8eb26fd613 1175-5326 2599047 08F8D9C4-EF4F-4D61-90B2-3C7B5E09A2A5 Neolissochilus soroides ( Duncker 1904 ) Lissochilus tweediei : Herre & Myers, 1937 : 61 (River Yum, a tributary of the River Plus). Neolissochilus soroides : Ahmad et al. , 2014: 18 (Sungkai Wildlife Reserve); Ahmad & Zakaria-Ismail, 2014 (Sg. Cha Chor; Sg. Kejar; Sg. Ketir; Sg. Purun; Sg. Tiang); Shafiq et al ., 2014 : 825 (Sg. Ara; Sg. Kurau); Authors' data (Lata Papan; Lata Tebing Tinggi; Lata Ulu Chepor; Malim Nawar; Sg. Ara; Sg. Bikam; Sg. Jelai; Sg. Jelutong; Sg. Ijok; Sg. Temelong; Sg. Ulu Kenas; Sg. Bongkok). Remarks. We considered any specimen that resembles the morphological features of the Neolissochilus genus as Neolissochilus soroides because the latest literature indicates that congener N. hendersoni can only be found in neighbouring Penang , Kedah and Kelantan . It is not recorded in Perak so far ( Khaironizam et al. , 2015 ). Neolissochilus soroides closely resembles but differs from N. hendersoni by having slightly higher scale and gill rakers count (lateral scales 20-24 vs. 18-22; gill rakers 14-17 vs. 12-14). Moreover, there are three mouth forms in N. soroides to add to the confusion. To be conservative, we felt it is best to regard all specimens found by studies in Perak as N. soroides for the time being until more investigations are carried out.