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66 results for “Pseudostaurosira”
FIGURES 48–57 in Pseudostaurosira crateri sp. nov. (Fragilariaceae, Bacillariophyta), a new small araphid, fossil diatom species from the Pleistocene (Atlantic Forest, Brazil)
FIGURES 48–57. SEM micrographs of Pseudostaurosira crateri Marquardt & C.E.Wetzel sp. nov. from type material (holotype SP365.548) sampled from Colônia Basin, São Paulo, Brazil: (48–51) Overall characteristics of the outer surface of the valve face. Notice an apical pore field on each valve end and striae each composed of one areola on valve face and two to three on mantle (50, 51). Arrow 1 points to the volae in the inner perimeter of the areolae (50). Arrow 2 points to the rudimentary or incipient spines located on the virgae (50–52). Girdle view of a frustule showing characteristics of the cingulum. Notice (arrow 3) open girdle bands (52). Detail of the areolae open into a single depression (arrow 4) running from valve face to mantle (53). Inner valve surface showing absence of rimoportulae and areolae characteristics (55–57). Notice internal detail (arrow 5) of superimposed disks formed by depositions of siliceous material on the volae (57). Detail (arrow 6) of apical pore field (57).
FIGURES 58–63 in Pseudostaurosira crateri sp. nov. (Fragilariaceae, Bacillariophyta), a new small araphid, fossil diatom species from the Pleistocene (Atlantic Forest, Brazil)
FIGURES 58–63. SEM micrographs of Staurosirella canariensis (Lange-Bertalot) E.Morales, Ector, Maidana & Grana in Grana et al. from River Oise (58, 61), Étang de l'Aumée (60, 63), and Étang des Landes (59, 62), France. (58–60) Valve view presenting details of sternum, apical pore fields, and striae composed of lineolae. Notice the "punch-hole" appearance of the striae (60). Detail of spatulated spines, 1-2 (occasionally) per virgae (60). Valve interior showing absence of rimoportulae (61). Notice the volae in the inner perimeter of the areolae (62). Girdle view showing closed girdle bands (62).
FIGURES 68–71 in Pseudostaurosira crateri sp. nov. (Fragilariaceae, Bacillariophyta), a new small araphid, fossil diatom species from the Pleistocene (Atlantic Forest, Brazil)
FIGURES 68–71. SEM micrographs of (68) Pseudostaurosira brevistriata (Grunow) D.M.Williams & Round from Lac de l'Uby, France. Valve view presenting details of sternum, apical pore fields, and striae composed of two rows of areolae. Notice profusely branched volae originated from the inner periphery of the areola and spines within striae. (69) Pseudostaurosira sp. Lac d'Arjuzanx, France. Valve view presenting details of sternum, apical pore fields, and striae composed of two to occasionally four rows of areolae. Notice conical spines within striae. (70) Pseudostaurosira parasitica (W.Smith) E.Morales in Morales & Edlund from Étang de Leon, France. Valve view presenting details of sternum and apical pore fields. Notice striae composed transapically elongated areolae. (71) Pseudostaurosira subconstricta (Grunow) Kulikovskiy & Genkal in Kulikovskiy et al. from Lac de la Cassière, France. Valve view presenting details of sternum and apical pore fields. Notice striae composed of one to six round and small areolae.
FIGURES 1–35 in Pseudostaurosira ellipticolanceolata, a new araphid diatom (Bacillariophyta) from Flanders, Belgium
FIGURES 1–35. Pseudostaurosira ellipticolanceolata André, Sabbe & Van de Vijver, sp. nov. LM and SEM pictures taken from the holotype material (BR-4776, Aardenburg sediment core, depth 85 cm, Belgium). 1–21. LM views of several specimens arranged in decreasing size. 22. SEM external view of an entire valve. 23. SEM view of two valves with interdigitating spines (white arrows). 24. SEM internal view of an entire valve, connected to another. 25. SEM external view of an entire valve. 26. SEM internal view of an entire valve. Note the raised virgae bordering the flat sternum. 27. SEM internal detail of the valve apex. The white arrow indicates the apical pore field. 28. SEM external detail of the valve apex. The white arrows indicate the eroded apical pore field. The black arrows indicate the presence of vestiges of the areola coverings. Scale bars = 10 µm (Figs 21, 22, 24, 26), 5 µm (Figs 23, 25, 27), 1 µm (Fig. 28).
FIGURE 1 in The morphology and molecular phylogenetics of some marine diatom taxa within the Fragilariaceae, including twenty undescribed species and their relationship to Nanofrustulum, Opephora and Pseudostaurosira
FIGURE 1. Map of the sampling sites where the studied clones were collected.
FIGURES 1–47 in Pseudostaurosira crateri sp. nov. (Fragilariaceae, Bacillariophyta), a new small araphid, fossil diatom species from the Pleistocene (Atlantic Forest, Brazil)
FIGURES 1–47. LM micrographs of Pseudostaurosira crateri Marquardt & C.E.Wetzel sp. nov. from type material (holotype SP365.548) sampled from Colônia Basin, São Paulo, Brazil. (1–39) Valvar view. (40–47) Frustules in girdle view. Figure 47 shows two neighboring frustules in girdle view. Scale bar 10 µm.
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