FIGURES 48–56. Figs. 48–50. Plagiogramma wallichianum. Fig. 48. SEM whole valve. Fig. 48a. SEM apical pore field. Fig. 48b in Diatoms (Bacillariophyta) From Artificial Substrates And Sediments In The Caribbean Sea Off Yucatan, Mexico

FIGURES 48–56. Figs. 48–50. Plagiogramma wallichianum. Fig. 48. SEM whole valve. Fig. 48a. SEM apical pore field. Fig. 48b. SEM detail of the rotae occluding areolae. Fig. 49. LM frustule in girdle view. Fig. 50. SEM frustule showing epicingulum overlapping hypocingulum. Figs. 51–52. P. rhombicum. Fig. 51. LM valve view. Fig. 52. SEM frustule in girdle view. Fig. 53. P. pulchellum var. pygmaeum. Fig. 54. Dimeregramma minus var. nanum, SEM whole valve. Figs. 55–56. Plagiogramma pulchellum. Fig. 55. SEM valve view. Fig. 56. LM valve view. Scale bar: figs. 48, 50, 52, 54 = 1 μm, figs. 49, 51, 53, 55 = 10 μm.