Table 1 Morphometric data of Tintinnopsis hemispiralis, T. kiaochowensis, and T. uruguayensis (measurements in μm). Lorica data are based on live specimens, and other data are based on protargol-stained specimens

Lorica, total length

T. hemispiralis

143

182

161.1

161

12.9

8.0

15

T. kiaochowensis

79

112

89.9

90

8.2

9.1

12

T. uruguayensis

50

73

62.3

62

7.7

12.4

15

Lorica, bowl width

T. hemispiralis

49

66

55.9

57

5.1

9.2

15

T. kiaochowensis

57

81

66.7

65

7.4

11.0

12

T. uruguayensis

25

41

32.6

32

4.5

13.7

15

Lorica, bowl length

T. hemispiralis

68

88

77.8

76

6.6

8.5

15

T. kiaochowensis

43

70

51.3

49

7.2

14.1

12

T. uruguayensis

32

52

39.0

39

5.7

14.6

13

Lorica, collar length

T. hemispiralis

64

97

83.3

86

8.4

10.1

15

T. kiaochowensis

32

46

38.7

38

4.6

12.0

12

T. uruguayensis

11

22

16.6

16

3.2

19.4

15

Lorica, opening diameter

T. hemispiralis

45

59

52.6

54

4.5

8.6

15

T. kiaochowensis

44

71

55.1

53

7.5

13.6

12

T. uruguayensis

24

42

33.1

33

5.4

16.4

15

Lorica, length: opening diameter, ratio

T. hemispiralis

2.9

3.2

3.1

3.1

0.1

2.4

15

T. kiaochowensis

1.4

2.1

1.6

1.6

0.2

10.5

12

T. uruguayensis

1.6

2.3

1.9

1.9

0.2

8.2

15

Lorica, narrowed portion diameter

T. kiaochowensis

38

63

48.8

47

7.7

15.9

12

T. uruguayensis

17

29

24.2

25

3.7

15.5

15

Lorica, total length: narrowed portion diameter

T. kiaochowensis

1.4

2.2

1.9

2.0

0.3

16.2

12

T. uruguayensis

1.8

3.2

2.6

2.6

0.4

16.0

15

Cell proper, length

T. hemispiralis

65

119

95.1

95

15.0

15.8

15

T. kiaochowensis

46

65

55.9

58

5.8

10.4

12

T. uruguayensis

25

56

31.5

30

7.4

23.5

15

Cell proper, width

T. hemispiralis

31

58

44.5

47

8.3

18.6

15

T. kiaochowensis

38

64

45.5

42

6.5

14.4

12

T. uruguayensis

18

28

22.5

22

3.0

13.3

15

Macronuclear nodules, number

T. hemispiralis

7

11

9.2

9

1.0

11.0

15

T. kiaochowensis

2

2

2.0

2

0.0

0.0

12

T. uruguayensis

2

2

2.0

2

0.0

0.0

15

Macronuclear nodules, length

T. hemispiralis

5

10

8.7

9

1.3

14.9

15

T. kiaochowensis

15

22

18.4

18

2.4

12.8

12

T. uruguayensis

6

14

8.3

7

2.3

27.2

15

Macronuclear nodules, width

T. hemispiralis

5

9

7.4

7

0.9

12.3

15

T. kiaochowensis

12

17

14.3

15

1.6

11.3

12

T. uruguayensis

4

10

5.8

5

1.8

31.4

15

Anterior cell end to anterior macronucleus nodule, distance

T. hemispiralis

17

21

19.1

19

1.8

9.4

15

T. kiaochowensis

11

24

19.2

18

4.1

21.6

12

T. uruguayensis

4

9

6.3

6

1.4

22.1

15

Ventral kinety, length

T. hemispiralis

39

66

56.6

55

5.2

9.3

15

T. kiaochowensis

22

37

32.3

34

4.7

14.5

12

T. uruguayensis

14

35

19.1

17

5.9

31.0

15

Ventral kinety, number of kinetids

T. hemispiralis

41

61

52.5

52

5.1

9.7

15

T. kiaochowensis

43

56

48.6

48

4.0

8.2

12

T. uruguayensis

17

28

20.3

21

2.3

11.3

15

Ventral kinety, distance to anterior end of cell

T. hemispiralis

4

8

5.5

5

0.8

15.3

15

T. kiaochowensis

3

5

4.1

4

0.5

12.6

12

T. uruguayensis

2

3

2.3

2

0.5

20.9

15

Dorsal kinety, length

T. hemispiralis

66

97

88.8

90

6.1

6.9

15

T. kiaochowensis

29

53

43.8

43

6.5

14.8

12

T. uruguayensis

21

41

26.5

24

5.5

20.8

15

Dorsal kinety, number of kinetids

T. hemispiralis

35

56

46.5

43

4.7

10.2

15

T. kiaochowensis

25

37

31.2

31

4.4

14.3

12

T. uruguayensis

17

29

21.1

20

3.5

16.7

15

Dorsal kinety, distance to right ciliary field

T. hemispiralis

4

6

4.5

4

0.6

14.1

15

T. kiaochowensis

4

6

4.7

5

0.7

14.0

12

T. uruguayensis

2

3

2.2

2

0.4

18.2

15

Dorsal kinety, distance to left ciliary field

T. hemispiralis

8

14

10.4

11

1.1

10.8

15

T. kiaochowensis

11

21

13.2

13

2.6

19.7

12

T. uruguayensis

2

5

3.2

3

0.7

21.8

15

Dorsal kinety, distance to anterior end of cell

T. hemispiralis

4

7

4.9

5

1.0

20.9

15

T. kiaochowensis

3

6

4.4

5

0.9

20.4

12

T. uruguayensis

2

3

2.3

2

0.5

20.9

15

Posterior kinety, length

T. hemispiralis

37

58

45.9

45

5.3

11.5

15

T. kiaochowensis

21

29

25.5

27

3.1

12.2

11

T. uruguayensis

11

22

13.7

12

2.9

21.0

15

Posterior kinety, number of kinetids

T. hemispiralis

11

22

17.0

17

2.7

15.7

15

T. kiaochowensis

11

18

15.4

15

2.0

12.8

11

T. uruguayensis

7

9

8.0

8

0.5

6.7

15

Posterior kinety, distance to anterior end of cell

T. hemispiralis

29

41

34.9

34

3.4

9.7

15

T. kiaochowensis

28

49

36.0

35

5.3

14.6

12

T. uruguayensis

12

21

15.5

15

2.5

16.1

15

Right ciliary field, number of kineties

T. hemispiralis

9

11

9.7

9

0.8

8.4

15

T. kiaochowensis

10

13

11.4

12

0.9

7.9

12

T. uruguayensis

7

8

7.3

7

0.5

6.3

15

Longest kinety in right field, length

T. hemispiralis

16

26

19.7

19

2.5

12.7

15

T. kiaochowensis

19

28

24.3

25

2.5

10.4

12

T. uruguayensis

7

14

10.3

10

2.2

20.9

15

Longest kinety in right field, number of kinetids

T. hemispiralis

15

19

16.6

16

1.0

5.9

15

T. kiaochowensis

11

15

12.4

12

1.1

8.7

12

T. uruguayensis

7

9

7.4

7

0.6

8.5

15

Shortest kinety in right field, length

T. hemispiralis

6

16

10.7

11

2.0

18.5

15

T. kiaochowensis

9

17

13.5

14

1.8

13.6

12

T. uruguayensis

3

6

4.5

4

0.9

20.5

15

Shortest in right field, number of kinetids

T. hemispiralis

6

11

8.6

8

2.2

25.2

15

T. kiaochowensis

6

7

6.5

7

0.5

8.0

12

T. uruguayensis

2

3

2.8

3

0.4

14.8

15

Left ciliary field, number of kineties

T. hemispiralis

9

12

9.8

9

1.0

10.3

15

T. kiaochowensis

9

11

9.9

10

0.7

6.7

12

T. uruguayensis

6

8

6.6

6

0.8

12.5

15

Longest kinety in left field, length

T. hemispiralis

17

28

23.3

24

3.3

14.0

15

T. kiaochowensis

11

16

12.5

12

1.4

11.6

12

T. uruguayensis

7

11

9.1

9

1.1

12.3

15

Longest kinety in left field, number of kinetids

T. hemispiralis

11

14

12.7

13

0.8

6.3

15

T. kiaochowensis

8

9

8.8

9

0.5

5.2

12

T. uruguayensis

6

8

7.3

7

0.6

8.2

15

Shortest kinety in left field, length

T. hemispiralis

4

8

5.8

6

1.3

22.8

15

T. kiaochowensis

4

7

5.8

6

1.0

17.7

12

T. uruguayensis

3

6

4.6

4

0.9

19.8

15

Shortest kinety in left field, number of kinetids

T. hemispiralis

3

5

3.7

4

0.6

15.9

15

T. kiaochowensis

3

4

3.6

4

0.5

14.4

12

T. uruguayensis

2

2

2.0

2

0.0

0.0

15

Lateral ciliary field, number of kineties

T. hemispiralis

11

20

15.4

15

2.3

7.7

15

T. kiaochowensis

13

19

15.9

15

1.8

11.5

12

T. uruguayensis

9

16

11.9

11

2.3

19.1

15

Lateral ciliary field, length of the longest kinety

T. hemispiralis

9

17

12.4

12

1.5

12.5

15

T. kiaochowensis

22

33

28.9

31

4.0

13.7

12

T. uruguayensis

9

14

11.8

12

1.6

13.7

15

Lateral ciliary field, length of the shortest kinety

T. hemispiralis

4

8

6.3

6

1.0

16.5

15

T. kiaochowensis

9

19

13.4

14

2.7

20.5

12

T. uruguayensis

7

11

9.5

10

1.4

14.9

15

Kineties in ciliary field, distance to anterior end of cell

T. hemispiralis

7

12

9.3

9

1.5

16.0

15

T. kiaochowensis

6

13

9.4

9

1.9

20.0

12

T. uruguayensis

2

3

2.3

2

0.5

20.9

15

Adoral zone of membranelles, diameter

T. hemispiralis

27

57

40.7

40

8.5

20.8

15

T. kiaochowensis

33

52

42.9

42

5.2

12.0

12

T. uruguayensis

12

21

17.0

17

1.9

11.1

15

Collar membranelles, number

T. hemispiralis

20

22

21.3

21

0.7

3.4

15

T. kiaochowensis

16

18

16.3

16

0.5

2.8

12

T. uruguayensis

18

19

18.2

18

0.4

2.3

15

Buccal membranelle, number

T. hemispiralis

1

1

1.0

1

0.0

0.0

15

T. kiaochowensis

1

1

1.0

1

0.0

0.0

12

T. uruguayensis

1

1

1.0

1

0.0

0.0

15

Prolonged membranelles, number

T. hemispiralis

4

5

4.7

5

0.5

10.5

15

T. kiaochowensis

3

3

3.0

3

0.0

0.0

12

T. uruguayensis

3

4

3.3

3

0.5

14.0

15