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Table 1 Comparison of Licmophora species; the first 4 columns are the new speciesa, b

From: Three new Licmophora species (Bacillariophyta: Fragilariophyceae) from Guam, two with an axial wave in the valve

Character L. repanda n. sp. L. undulata n. sp. L. joymaciae n. sp. L. attenuata L. labianatis L. flabellata L. colosalis L. grandis L. flucticulata
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
  1. aFor species studied here, n = 10 unless specified otherwise
  2. bn/a = not applicable