Tetmemena Eigner, 1999

Tetmemena Eigner, 1999

1997 Clara View in CoL n. g. —Eigner, J. Eukaryot. Microbiol. 44:568 (homonym of Clara Gill, 1862 View in CoL , fish, objective synonym of Tetmemena Eigner, 1999 ).

1999 Tetmemena nom. nov. – Eigner, Eur. J. Protistol. 35:44, 47 (replacement name for Clara Eigner, 1997 View in CoL ).

2001 Tetmemena Eigner, 1999 —Aescht, Denisia 1:159 (catalogue of ciliate genera).

2001 Tetmemena Eigner, 1999 —Berger, Catalogue of Ciliate Names 1. Hypotrichs, p. 89.

2008 Tetmemena Eigner, 1999 —Lynn, The Ciliated Protozoa, p. 360 (revision of ciliate families).

2015 Tetmemena Eigner, 1999 —Shao, Lu and Ma, J. Ocean. Univ. China 14:7 (characterization of genera in subfamily Stylonychinae ).

Improved diagnosis: Stylonychine with medium to large body size. Body ellipsoidal. Two separate macronuclear nodules. Eighteen FVT cirri; frontal cirri in middle of narrow frontal area. Transverse cirri arranged in one V-shaped group. One right and one left row of marginal cirri. Undulating membranes in Stylonychia pattern. Six dorsal kineties, including two dorsomarginal rows; kinety 3 with simple fragmentation. Three narrowly to moderately widely spaced caudal cirri, one each at posterior end of kineties 1, 2, and 4. Oral primordium originates left to postoral cirri. Cirrus IV/3 produces anlagen IV–VI of the proter; cirri III/2, IV/2, and V/4 involved in primordia formation. 18S rRNA gene: 203 (T); 631 (A); 670 (T); 695 (G); 698 (G); 709 (C); 711 (C); 1403 (A); 1638 (C); 1722 (C); 1731 (T).

Type species: Tetmemena pustulata (Müller, 1786) Eigner, 1999 .

Species assignable: Tetmemena pustulata (Müller, 1786) Eigner, 1999 ; Tetmemena indica Bharti et al., 2019 (original combination: Tetmemena pustulata indica Bharti et al., 2019 ); Tetmemena polymorpha Omar et al., 2023 ; and Tetmemena saprai Gupta et al., 2020 .

Species misclassified in Tetmemena : Tetmemena vorax ( Stokes, 1885) Eigner, 1999 . Original combination and current systematic status: Stylonychia vorax Stokes, 1885 .

Remarks: Wirnsberger et al. (1985) misidentified a population of Stylonychia bifaria (current status: Antetetmemena bifaria comb. nov.) as S. vorax and described its morphology and ontogenesis. According to these data, Eigner (1997) transferred S. vorax to the genus Clara and later replaced the genus name by Tetmemena ( Eigner, 1999) . The misidentification occurred in the study by Wirnsberger et al. (1985) was recognized by Foissner (1998) and Berger (1999), hence Berger (2001) transferred S. bifaria to the genus Tetmemena and considered S. vorax as a member of the genus Stylonychia .