New species and records of Colurella (Rotifera: Lepadellidae) from South China, with a key to Chinese Colurella Author Wei, Nan Author Jersabek, Christian D. Author Xu, Runlin Author Yang, Yufeng text Zootaxa 2019 2019-04-18 4586 3 475 490 journal article 27003 10.11646/zootaxa.4586.3.5 78fa0540-bfb3-4c88-a84d-eb9c203779cc 1175-5326 2647236 E7AA11D0-E7E9-4673-820C-8DBA7AC55A5C Key to Colurella species recorded in China , modified from De Smet et al . (2015) 1. One toe............................................................................. C. unicauda Eriksen - Two toes, spread or appressed giving impression of single toe.................................................. 2 2. Lorica broad lenticular in lateral view; head aperture margins oblique, strongly directed ventrally; two short spread toes........................................................................................... C. obtusa (Gosse) - Lorica elongate, plump or ovate, not broad lenticular in lateral view; head aperture margins not or only weakly directed ventrally............................................................................................... 3 3. Toes short, toe length/lorica length usually ± 1/4, always separate............................................... 4 - Toes long, toe length/lorica length usually Ż 1/3, spread or appressed............................................. 6 4. Lorica moderately slender; head aperture smaller than greatest lorica height; posterior end of lorica gradually merging into downward curving short projections....................................................... C. uncinata (Müller) - Lorica moderately slender or plump; head aperture as long as or slightly smaller than greatest lorica height; posterior end of lorica gradually merging into downward curving short or more or less long projections.............................. 5 5. Lorica plump, ending in short, mostly downward curving acute tips.................. C. uncinata bicuspidata (Ehrenberg) - Lorica moderately slender, ending in robust, mostly ventrally directed acute tips........... C. uncinata deflexa (Ehrenberg) 6. Lorica ovate, length/height Ṩ 1.7 ; head aperture margins almost rounded, usually highest in median part................ 7 - Lorica moderately slender or elongate, length/height À 1.7; head aperture margins variable, usually not rounded.......... 9 7. Posterior end of lorica asymmetrical, right side smoothly rounded or with shallow notch, left side tapering to acute tip............................................................................................. C. ovalis sp. nov. - Posterior end of lorica symmetrical....................................................................... 8 8. Foot aperture without dorsal notch; lorica posterior end triangular in lateral view, tongue-shaped in ventral/dorsal view; toes usually appressed............................................. C. sanoamuangae Chittapun, Pholpunthin & Segers - Foot aperture with wide u-shaped dorsal notch; toes spread.................................... Colurella sp. ( Fig. 5 ) 9. Posterior end of lorica tapering to acute angles or tips, occasionally weakly extended or merging into hook-shaped latero-dorsally pointing projections............................................................. C. adriatica Ehrenberg - Posterior end of lorica angular with blunt tip, obtuse or rounded................................................ 10 10. Foot aperture with or without inconspicuous dorsal notch; posterior end of lorica angular with blunt tip................ 11 - Foot aperture with conspicuous dorsal notch or incision, more or less deeply extending dorsally; posterior end of lorica obtuse or rounded.......................................................................................... 12 11. Animal slightly smaller (lorica length 60–82 µm ; toe length 30–38 µm ); lorica usually higher (length/height average 1.59 (1.50–1.85)); ventral sulcus with conspicuous median keel......................................... C. psammophila - Animal slightly larger (lorica length 92 µm ; toes length 42 µm ); lorica relatively lower (length/height 1.87); ventral sulcus without median keel.............................................................. C. cf. psammophila ( Fig. 6 ) 12. Animal usually larger (lorica length 71–110 µm ); head aperture smaller than greatest lorica height; dorsal margin evenly curved; toes usually appressed......................................................... C. colurus (Ehrenberg) - Animal usually smaller (lorica length 50–86 µm ); head aperture almost as long as greatest lorica height; dorsal lorica margin almost straight anteriorly, posterior part strongly curved; toes spread or appressed................................. 13 13. Lorica usually higher (length/height 1.56–1.88); head and foot apertures shallower; toes spread..... C. hindenburgi Steinecke - Lorica usually lower (length/height 1.75–2.15); head and foot apertures deeper; toes spread or appressed...................................................................................................... C. geophila Donner