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4 results for “Punctastriata”
FIGURES 13–18 in Punctastriata altera sp. nov. (Bacillariophyta, Fragilariophyceae), a diatom from the United States of America
FIGURES 13–18. SEM images of Punctastriata altera sp. nov. from type material from the Cosumnes River, Sacramento County, U.S.A. 13, 14. Details of spines with skirt-like projections (white arrow heads). Neighboring valve connection is shown in Fig. 14. Also notice broken copulae in Fig. 14. 15, 16. Apical pore fields at head pole and foot pole, respectively (black arrows). Notice that skirt-like projections in Fig. 16 only go partially to the front of the spine (white arrow heads). 17, 18. Detail of valvocopulae. Fig. 17 shows apparent closed tips of a valvocopula that is broken on its side (white arrows). Notice lobed fimbriae (black arrow heads) and several broken copulae in the valve interior. Fig. 18 shows entire, apparently closed (white arrows), fimbriate valvocopula. Scale bars = 1 µm (Figs 13–16), 2 µm (Figs 17, 18).
FIGURES 1–12 in Punctastriata altera sp. nov. (Bacillariophyta, Fragilariophyceae), a diatom from the United States of America
FIGURES 1–12. Punctastriata altera sp. nov. from type material from the Cosumnes River, Sacramento County, U.S.A., ANSP G.C. 106796a. 1–8 LM images, Fig. 3 is the holotype. 9–12. SEM images. 9, 10. Outer valve views showing details of axial area, striation pattern, spine position, consistent apical depression (white arrows), and apical pore fields on both valve ends (black arrows). 11. Valve interior showing axial area, troughs harboring the striae, and apical pore fields on both valve extremes (black arrows). 12. Girdle view of frustule showing details of valve mantle, consistent apical step (white arrows) and girdle bands. Notice curved valvocopulae ends (near white arrows) suggesting they are open from this side view. Scale bars = 10 µm (Figs 1–8), 5 µm (Figs 9–12).
FIGURES 21–26 in A new species of Punctastriata (Bacillariophyta, Fragilariophyceae) from temporary streams in southern Portugal
FIGURES 21–26. SEM images of Punctastriata obstinata sp. nov. from type material BR-4654, Oeiras Stream, Portugal. 21. Valve view showing second row of spines on valve mantle (white arrows) and open copula (white arrowheads). 22. Valve internal view showing apical pore fields (dashed arrows), the volae that are well-developed, and the raised axial area-virgae together with the recessed striae. 23. Girdle, tilted view of frustule showing second row of spines on mantle (white arrows), and skirt-like, flared projection of the spines (black arrow). 24. Close up on valve mantle showing spines with skirt-like, flared projections in formation (black arrows) and open copula (white arrowhead). 25. Internal view of striae showing multiseriate striae with very small areolae and volae extending inwards, accumulating mineral material. Notice the striae lies in a single internal depression running from valve face to mantle. 26. Close up on internal elliptic opening of the apical pore field (dashed arrow). Notice small round poroids. Scale bars: 0.5 µm (Figs 25, 26), 1 µm (Figs 21–24).
FIGURES 1–20 in A new species of Punctastriata (Bacillariophyta, Fragilariophyceae) from temporary streams in southern Portugal
FIGURES 1–20. LM images of Punctastriata obstinata sp. nov. from type material BR-4654, Oeiras Stream, Portugal. 1–18. Valve views arranged in a size diminution series, notice the overall elliptic to slightly ovate shape and the slightly pointy foot pole seen in some valves; Fig. 2 is the holotype. 19–20. Girdle view of short chains. Scale bar: 10 µm (Fig. 20).
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