Table 1 Comparison of Licmophora species; the first 4 columns are the new species^{a, b}

Valve shape

Spathulate, basal pole not inflated

Spathulate, inflated basal pole

Cuneate, Not inflated basal pole

Attenuate

Spathulate

Long, narrow, spathulate with rostrate base

Spathulate with inflated base

Spathulate

Spathulate with very elongate wavy ‘stem’

Valve length (μm)

190–215

150–200

300–400

209–339

311–365, n = 9

74–160; 60–300

2 populations: 142–177; 220–335

90–180 (40–62 – Honeywill)

450–850

Valve width at apical pole (μm)

12–18

5–15

17–20

18–20

19–21

9–10

2 populations: 15–18.8; 23–27

10–14 (9–10)

10–14

Valve width at basal pole (μm)

6–7

3–5

6–10

9–10

6–7

8–9

Striae in 10 μm near apex

25–30

30–35

30–35

19–25

32–35, n = 5

35; 29–35

23–27

21–23

37–38

Striae in 10 μm near base if different

n/a

n/a

26–28

n/a

n/a

n/a

n/a

n/a

n/a

Areolae in 10 μm near apex

12–14

10–12

17–20

15–16

14–21, n = 6

35

21–26

25

none

Multiscissura slits

23–26

20–24

26–29

34–38

34–41, n = 4

30; 30–45

29–34

16

40

Rimoportulae per cell

3

2

3

3

2

3 + intercalary

2

2

2

Apical rimoportula(e)

small funnel beyond sternum

small funnel end of sternum, edge of mantle

small funnel beyond the sternum and on the mantle

5–7 striae below spine, right of sternum

Beyond tip of sternum on mantle

Small apical rimo with numerous smaller rimos at irregular intervals along sternum

Massive, fan-shaped, on valve mantle

Massive, fan–shaped; on valve mantle; short stalk

Valvocopula septum

Shallow

Shallow

Shallow

Shallow

Shallow

Apparently none

Shallow

Moderately deep

None

Valvocopula striae in 10 μm

36–37

39–40

41–42

35–38

46–49

55

Valvocopula advalvar striae

All along

End half-way

End half-way

All along

All along

End half-way

4th pleura character

Apical cap, narrow band

Apical cap, narrow band

Somewhat larger apical cap

Apical cap, narrow band

Apical cap, narrow band

Broad band with apical ligule

References

this study

this study

this study

this study

Lobban et al. 2018

Honeywill 1998 and others

Belando et al. 2016

Hustedt 1931; Honeywill, 1998

Lobban et al. 2011