Cladocera (Crustacea: Branchiopoda) of Sabah state in Borneo Island, Malaysia Author Sinev, Artem Y. Author Yusoff, Fatimah M. text Zootaxa 2015 4000 5 581 591 journal article 10.11646/zootaxa.4000.5.7 c6e7df05-770a-45e9-a68f-3f1f85dc6a8d 1175-5326 243747 97E6464E-A5ED-4B89-8DB1-7F6CB17EA87E Family Ilyocryptidae Ilyocryptus spinifer Herrick, 1882 . Uncommon in Sabah, found in one pond, one stream and in a paddy field. Benthic species, associated with muddy or clay bottom. For detailed description see Kotov & Dumont (2000) . The species is cosmopolitan, no evidence of non-cosmopolitanism has been found ( Kotov & Dumont 2000 ), common in the Oriental region. Ilyocryptus yooni Jeong, Kotov & Lee, 2012 . Single specimen ( Fig. 1 A–D) was found in a small stream (loc. 25), co-occuring with I. spinifer . I. yooni belongs to the agilis -line sensu Kotov & Elías-Gutiérrez (2009) , which is characterized by at least a short distance between proximalmost lateral seta and anus, short spinules at the base of ventral margin of the postabdominal claw, and posterior setae of valves with additional spines ( Fig. 1 A–B). It differs from its sibling-species with complete moulting, I. agilis and I. isanensis , by the absence of any spinules between bases of teeth of preanal margin of postabdomen ( Fig. 1 D). I. yooni can be differentiated from I. spinifer by complete moulting and by lateral row of spines on postabdomen ending at anal margin. For detailed description see Jeong et al . (2012) . The species is known from Far East of Russia , Japan , Korea and North China ( Jeong et al ., 2012 ), recently it was found on Hainan island ( Sinev et al. , 2015 in press).