A new and five rare bdelloids from Korea Author Song, Min Ok Author Lee, Chang-Ho text Zootaxa 2017 4242 3 529 547 journal article 36293 10.11646/zootaxa.4242.3.6 a44b7ad0-87ec-4929-a0a2-d3311cdb0b3f 1175-5326 376952 7D138C79-0C54-44BD-8B59-DC3143E414AC Key to the species of genus Philodina 1. Cerebral eyes absent.................................................................................. 2 - Cerebral eyes present................................................................................ 10 2. Dorsal toe pair always extended............................................................... P. duplicalcar - Dorsal toe pair not always extended..................................................................... 3 3. Two pairs of spurs............................................................................. P. scabra - One pair of spurs.................................................................................... 4 4. First foot pseudosegment with two small projections................................................... P. childi - First food pseudosegment without any projections.......................................................... 5 5. Dental formula 4/4–5/5........................................................................ P. grandis - Dental formula 2/2–3/3............................................................................... 6 6. Interspace between spurs narrower than spur base width..................................................... 7 - Interspace between spurs much wider than spur base width................................................... 8 7. Sulcus as wide as trochal disc width............................................................... P. rapida - Sulcus much narrower than trochal disc width........................................................ P. plena 8. Interspace between spurs 2.5–3 times as wide as spur base width......................................... P. vorax - Interspace between spurs much wider than 4 times of spur base width........................................... 9 9. Disc retractor V-shaped or bilobed medially........................................................ P. proterva - Disc retractor slightly convex and trilobed medially............................................. P. koreana n. sp. 10. Trunk highly granulated; rostrum with collar-like protuberances proximoventrally; first foot pseudosegment with transverse ridge dorsally......................................................................... P. rugosa coriacea - Trunk smooth...................................................................................... 11 11. Dorsal toe pair always extended a little or fully; upper lip concave medially....................... P. acuticornis odiosa - Dorsal toe pair otherwise............................................................................. 12 12. Upper lip bilobed; spurs thumb-shaped and with small knob or sharp points at ends........................ P. flaviceps - Upper lip arched and low; spurs conical, thin, long and curved outward.................................. P. roseola