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Figures 51–70. Figs. 51–55. Mastogloia emarginata. Figs 51-54 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 51–70. Figs. 51–55. Mastogloia emarginata. Figs 51-54. LM views of two specimens focused on valve face and valvocopula, arrowhead indicates one of the prominent exit pores of the partecta (GU44AR-2) (DIC). Fig. 55. Internal view of valve and valvocopula (GU55B-4) (SEM). Figs 56, 57. Mastogloia ovulum specimen at two focal planes (GU44K-6) (DIC). Figs 58-61. Mastogloia matthaei, two specimens at two focal planes (GU52P-2) (DIC). Figs. 62, 63. Mastogloia obliqua, valve at two focal planes (GU66F-4) (DIC). Figs. 64–67. Mastogloia peracuta (GU44AP-9). Figs 64, 65. Specimen at two focal planes (DIC). Figs 65, 66, External views of two specimens in SEM. Figs 68–71. Mastogloia pumila. Figs 68, 69. Specimen in DIC at two focal planes (GU52P-1; catalog # GUD002950). Fig. 70. Internal aspect of valve and valvocopula (GU52P-9) (SEM). Fig. 71. Frustule showing both internal and external valve faces. Scale bars: Figs 51–69 = 5 µm, Figs 70, 71 = 3 µm.

Figures 22–40. Figs 22–26 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 22–40. Figs 22–26. Cocconeis ornata, two valves at two focal planes each in DIC and external view in SEM (GU44AU-2). Figs 27–32. Cocconeis subtilissima. Figs 27, 28. Frustules in LM (GU44I-2, GU44Z-15) (DIC). Figs 29, 30. RV external and internal with valvocopula (GU44AQ-1). Figs 31, 32. SV external (whole mount, GU44AC-4), showing the alveolae at the fracture (arrow), and internal (GU44AQ-1). Figs 33–40. Colliculoamphora gabgabensis. Fig. 33. Holotype specimen (GU44AK-6) (DIC). Fig. 34. Paratype specimen (GU44I-1) (DIC). Fig. 35. Specimen showing deeper indentation (GU44AK-6). Figs 36–38. External views, showing the eunotid position of the raphe; arrows on Fig. 37 indicate short striae; Fig. 38 shows girdle bands (GU44AK-6, GU44Z-15, GU52Q-10a, respectively) (SEM). Figs 39, 40. Internal views (GU44W10, GU44K-6) (SEM). Scale bars: Figs 22–36 = 5 µm, Figs 37, 38 = 2.5 µm, Figs 39, 40 = 2 µm.

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.

Figures 16–21. Figs 16, 17 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 16–21. Figs 16, 17. Comparison of frustules of Campylodiscus fastuosa (Fig. 16) and Surirella scalaris (Fig. 17) showing crossed orientation of valves in the former versus parallel orientation in the latter. (GU66F-7A, GU52P-5, respectively) (SEM). Fig. 18. Frustule of C. fastuosa (GU66F-7A) (SEM). Figs 19, 20. C. fastuosa internal valves faces of small and large cells (GU66F-7A) (SEM). Fig. 21. Cocconeis dapalistriata, sternum valve (GU44AU-2) (SEM). Scale bars = 5 µm.

Figs 1–6 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)

Figs 1–6. Amphora rhombica var. intermedia (GU43C). Figs 1, 2. Valve with curved raphe at two focal planes (DIC). Figs. 3, 4. Valve with nearly straight raphe at two focal planes (DIC). Fig. 5. Internal view of valve showing conopeum over central raphe endings (SEM). Fig. 6. External ventral view of valve showing girdle bands and conopeum over the central raphe endings. Fig. 7. Asteromphalus cleveanus (GU52N-4) (DIC). Figs 8, 9. Asteromphalus hepactis internal view and detail (GU56A) (SEM). Scale bars: Figs 1–4, 6–8 = 10 µm, Figs 5, 9 = 5 µm.

Figures 10–12. Auricula flabelliformis. Figs 10, 11 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 10–12. Auricula flabelliformis. Figs 10, 11. LM and SEM images of specimens from Yap (Y26B) (DIC) and Guam (GU66A-2) (SEM). Only half of each image is shown so that the delicate striation is visible. Fig. 12. Detail of internal valve face showing very short ventral surface and flabelliform striation (GU66A-2) (SEM). Fig. 13. C. fastuosus large valve (GU66F-8, catalog # GUD002914) (DIC). Figs 14, 15. C. fastuosus small valve (Fig. 14) compared to S. scalaris (GU52Q-2, GU52Q-10b respectively) (DIC). Scale bars: Figs 10, 11, 13–15 = 10 µm, Fig. 12 = 5 µm.

Figures 111–113 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 111–113. Vikingea cf. gibbocalyx. Fig. 111. Raphe valve in LM. Fig. 112. Sternum valve, exterior in SEM. Fig. 113. Broken frustule showing external raphe valve Scale bars: Fig. 111 = 10 µm, Figs 112, 113 = 5 µm.

Figures 59–62. Hyalosynedra laevigata. Figs 59, 62 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 59–62. Hyalosynedra laevigata. Figs 59, 62. External view and detail of apex showing hyaline tip beyond the rimoportula opening (arrow) and the three rows of pores in the ocellulimbus. Figs 60, 61. Internal view with detail of apex showing character of the rimoportula (arrow). Scale bars: Figs 59, 60 = 10 µm, Fig. 61 = 2 µm, Fig. 62 = 1 µm.

Figures 107–110 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 107–110. Tryblionella cf. jelinecki. Fig. 107. Valve in LM. Figs 108, 109. Valve external in SEM. Fig. 110. Valve apex internal aspect. Scale bars: Fig. 107 = 20 µm, Figs 108, 110 = 10 µm, Fig. 109 = 5 µm.

Figures 87–90. Proschkinia complanata, SEM. Fig. 87 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 87–90. Proschkinia complanata, SEM. Fig. 87. Entire recently divided frustule showing two external valve faces and one internal, along with numerous girdle bands. Fig. 88. Detail of central area showing short stria on side with fistula (arrow) and flap covering fistula opening (arrowhead). Figs. 89, 90. Central area internal views showing fistula and accessory pores (arrows, Fig. 89); elevated raphe rib (arrow, Fig. 90). (Fig. 89 is detail of frustule in Fig. 87.) Scale bars: Fig. 87 = 5 µm, Figs 88, 90 = 2 µm, Fig. 89 = 1 µm.

Figures 71–80 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 71–80. Moreneis, Nitzschia and Olifantiella. SEM except Fig. 71. Figs 71–74. Moreneis hexagona. Fig. 71. Valve in LM (DIC). Fig. 72. Valve exterior, showing isolated pores at the Voigt faults (arrows). Fig. 73. Valve exterior detail showing central raphe endings characteristic of the genus and c-shaped areolae. Fig. 74. Valve interior. Figs 75–78. Nitzschia incurva. Figs 75, 76. Guam voucher frustules at different angles. Figs 77, 78. Yap specimens showing interior and details of areolae. Figs 79, 80. Olifantiella mascarenica frustule showing the characteristic buciniportula (arrow). Scale bars: Fig 75 = 10 µm, Figs 71, 72, 74, 76, 77 = 5 µm, Figs 73, 78 = 2 µm, Figs 79, 80 = 1 µm.

Figures 32–38. Biremis and Campylodiscus. Figs. 32–37. Biremis ridicula. Fig. 32 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 32–38. Biremis and Campylodiscus. Figs. 32–37. Biremis ridicula. Fig. 32. Frustule in "ventral" girdle view, LM. Fig. 33. Valve and girdle bands in girdle view at two focal planes, LM. Fig. 34. Valve, interior view, SEM. Fig. 35. Frustule in "ventral" girdle view. Fig. 36. Valve in valve view showing asymmetry. Fig. 37. Detail of Fig. 34 showing alveoli and asymmetry. Fig. 38. Campylodiscus robertsianus valve in LM. Scale bars: Fig. 38 = 25 µm, Figs 32–36 = 10 µm, Fig. 37 = 5 µm.

Figures 15–19 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 15–19. Berkeleya cf. hyalina. Figs 15, 16. Living macroscopic colonies in dissection microscope and low power compound microscope. Figs 17, 18. Detail of living cells in colony showing central plastids (cells all in girdle view). Fig. 19. Acid cleaned valve showing hyaline character. Scale bars: Fig. 15 = 1 mm, Fig. 16 = 100 µm, Fig. 17 = 25 µm, Figs 18–20 = 10 µm, Figs 21, 22 = 5 µm.

Figures 8–14 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 8–14. Auricula and "Bacillaria." Figs 8, 9. Auricula densistriata. Figs. 10–14. "Bacillaria Group B" sensu Schmidt, var. tumidula. Fig. 10. Acid cleaned frustules in LM. Fig. 11. Live cell. Fig. 12. Internal valve surface, SEM. Fig. 13. Wider central part of cell in SEM, showing external short cristae (arrow). Fig. 14. Apex of frustule in SEM showing the raphe flap (arrow) that links cells together and girdle bands. Scale bars: Fig. 11 = 25 µm, Fig. 10 = 10 µm, Figs 8, 9, 12–14 = 5 µm.

Figures 50–58 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 50–58. Dictyoneis apapae, sp. nov. (cont.), except Figs 51, 56, putative D. marginata from Gray's Reef National Marine Sanctuary, Georgia; SEM, cont. Figs. 50, 51. Comparison of the two species' exteriors with the following three points of distinction: 1. Central area; 2. Marginal pseudoloculi; 3. Apical groove. Fig. 52. Detail of an isolated valve apex. Fig. 53. Central region of isolated valve showing central nodule and poration on mantle with short intercalary striae, with a few longer (arrowhead), forming a denser band (arrow) before a hyaline border. Fig. 54. Fractured valve showing wall structure with large outer pores (arrow), smaller ridges defining smaller holes, and showing the slit-like inner foramina. Figs 55, 56. Comparison of the two species' interiors, both valves with valvocopula. Figs 57, 58. Opposite poles of a frustule in girdle view showing copulae. Arrow shows deep indent on end of valvocopula, which appears closed at that end as well as at the opposite; 2nd copula open and 3rd copula with large ligule that fills the indentation on the valvocopula. Scale bars: Figs 50, 51, 55–58 = 10 µm, Figs 52, 53 = 5 µm, Fig. 54 = 2 µm.

Figures 44–49 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 44–49. Dictyoneis apapae, sp. nov. Figs 44, 45 LM, all others SEM. Fig. 44. Holotype (stack of two focal planes), slightly oblique, showing apparent striae and apparent chambers on near side. Fig. 45. Valve straight on, central nodule focal plane. Fig. 46. Valve in SEM showing external side of pseudoloculi; note opposite deflection of terminal raphe endings (arrows); enlarged in next two figures. Fig. 47. Detail of apex showing large groove in mantle and two rows of pores in the valvocopula (VC). Fig. 48. Detail of central area showing double layer of external pseudoloculi; also showing external raphe slits bordered by thin ridges of silica (arrow), and absence of circular area of small pseudoloculi. Fig. 49. Detail of marginal pseudoloculi. Scale bars: Figs 44–46 = 10 µm, Figs 47–49 = 5 µm.

Figures 65–70. Mastogloia. Figs 65, 66. Mastogloia ovata exterior and interior valve faces. Fig. 67 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 65–70. Mastogloia. Figs 65, 66. Mastogloia ovata exterior and interior valve faces. Fig. 67. Mastogloia pseudolatecostata (Bikar Atoll, Marshall Is.), external valve face with part of valvocopula showing partecta. Figs. 68–70. Mastogloia cf. pisciculus. Fig.68. LM (DIC) with foci on valve face and partecta Arrows on this and next image point to longitudinal rib bisecting the inner zone. Fig. 69. External surface, SEM. Fig. 70. Internal valve face and partecta, also showing partly double row of areolae (arrow). Scale bars: Figs 67, 68 = 10 µm, Figs 65, 66, 69, 70 = 5 µm.

Figures 26–31. Biddulphiella and Biremis. Figs. 23–26. Biddulphiella tridens. Fig. 26 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 26–31. Biddulphiella and Biremis. Figs. 23–26. Biddulphiella tridens. Fig. 26. Frustule in valve view at two focal planes. Figs 27, 28. Valves in girdle and valve view, respectively, SEM. Fig. 29. Valve in oblique view, emphasizing the deep grooves (sulci) between the elevations. Figs. 30, 31. Biremis ambigua frustules in SEM. Fig. 30. Oblique view showing raphe and paired external alveolus openings. Fig. 31. Broken frustule showing internal side of alveoli (arrow) and exterior of girdle bands. Scale bars = 10 µm.

Figures 1–7. Figs 1, 2 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 1–7. Figs 1, 2. Actinocyclus cuneiformis, LM, arrows showing rimoportulae. Figs 3, 4. Amphora spectabilis: Fig. 3. LM at two focal planes showing different striae densities on dorsal and ventral surfaces. Fig. 4. Palau specimen in SEM showing character of striae. Figs. 5–7. Amphora subhyalina. Fig. 5 LM, showing the hyaline character. Fig. 6. SEM detail of valves with conopea at central raphe endings (arrow), also showing striae on dorsal (double arrowhead) and ventral (single arrowhead) part of girdle band. Fig. 7. Frustule showing broad dorsal part of some girdle bands. Scale bars: Figs 1–5, 7 = 10 µm, Fig. 6 = 5 µm. Unless indicated otherwise, all light microscopy (LM) was with differential interference contrast (DIC).

Figures 39–43. Figs. 39–41. Cocconeis carinata. Fig. 39 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist

Figures 39–43. Figs. 39–41. Cocconeis carinata. Fig. 39. Cluster of cells in LM. Fig. 40. Sternum valve. Fig. 41. Raphe valve. Figs. 42, 43. Coscinodiscus hauckii in LM and SEM. Scale bars: Figs 39, 42 = 10 µm, Fig. 43 = 5 µm, Figs 40, 41 = 1 µm.