Figures 41–50. Figs 41, 42 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)

Figures 41–50. Figs 41, 42. Hemidiscus cuneiformis var. ventricosa (GU66F-4) (DIC). Fig. 41. Valve view; arrow points to pseudonodulus. Fig. 42. Oblique view with focus on several of the rimoportulae (arrow). Figs 43–48. Lauderia excentrica. Fig. 43. Holotype specimen (GU44I-1) (DIC). Fig. 44. External view of valve showing excentric, reniform annulus and external rimoportula opening (arrow) (GU44Y-13) (SEM). Fig. 45. External detail of annulus (GU55B-4) (SEM). Fig. 46. Internal view of valve with rimoportula (arrow), also showing the external aspect of the fultoportulae along the bottom rim (GY44Y-13) (SEM). Figs 47, 48. External and internal details of striae and fultoportulae, showing 5 satellite pores in the central fultoportulae (arrowhead) and 2-4 in the striae (arrow) (GU44Y-13) (SEM). Figs 49, 50. Mastogloia affirmata valve and valvocopula at two focal planes (GU44AX-1) (DIC). Scale bars: Figs 41, 42, 49, 50 = 10 µm, Figs 43, 44, 46 = 5 µm, Figs 45, 47, 48 = 2 µm.