Trimyema, Lackey, 1925, Lackey, 1925

Li, Ran, Zhuang, Wenbao, Feng, Xiaochen, Al-Farraj, Saleh A., Schrecengost, Anna, Roưerova, Johana, Beinart, Roxanne A. & Hu, Xiaozhong, 2023, Molecular phylogeny and taxonomy of three anaerobic plagiopyleans (Alveolata: Ciliophora), retrieved from two geographically distant localities in Asia and North America, Zoological Journal of the Linnean Society 199 (2), pp. 493-510 : 507

KEY TO VALID SPECIES OF TRIMYEMA —MODIFIED FROM ḎHL (1931) AND AUGUSTIN ET AL. (1987)

1. Anterior end slightly thick ............................................................................................................................................................................2 Anterior end not thick ...................................................................................................................................................................................3

2. 40 μm long, four ciliary girdles extended to two-thirds of cell length............................................................. Trimyema claviformis 60 μm long, six ciliary girdles extended almost to the posterior end of the cell............................................ Trimyema alfledkahli

3. Body asymmetric, tapered at both ends, anterior end deflected to the right and posterior end deflected to the leħ, five ciliary girdles...................................................................................................................................................................................... Trimyema kahli Body symmetrical, fusiform ellipsoidal or ovoid .....................................................................................................................................4

4. More than three complete (encircle completely about or more than 360°) ciliary girdles .............................................................5 Three complete ciliary girdles ......................................................................................................................................................................6

5. Endocommensal in sea urchins, seven complete ciliary girdles.................................................................... Trimyema echinometrae Free-living, four complete ciliary girdles ............................................................................................................ Trimyema pleurispiralis

6. Oral opening beak-like projected to the right.......................................................................................................... Trimyema minutum Oral opening without a beak-like projection ............................................................................................................................................7

7. Mucocyst girdle present, hypersaline water............................................................................................................ Trimyema koreanum Mucocyst girdle absent..................................................................................................................................................................................8

8. Extra short and incomplete ciliary girdles absent....................................................................................................................................9 Extra short and incomplete ciliary girdles present ............................................................................................................................... 10

9. Ciliary girdles extended greater than 450°, 14–24 somatic kineties, five dikinetids at the anterior region of OK1..................... ............................................................................................................................................................................................. Trimyema shoalsia Ciliary girdles extended slightly more than 360°, 26–32 somatic kineties, mainly three dikinetids at anterior region of OK1 ............................................................................................................................................................................................. Trimyema foissneri

10. Three short ciliary girdles on the ventral side, one short girdle on the dorsal side .......................................... Trimyema marinum One short ciliary girdle on the ventral side ............................................................................................................................................ 11

11. 50–60 somatic kineties............................................................................................................................................ Trimyema compressum 34–45 somatic kineties...................................................................................................................................................... Trimyema finlayi