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47 results for “Trilamina”
FIGURES 87–93 in Entogoniopsis gen. nov. and Trilamina gen. nov. (Bacillariophyta): a survey of multipolar pseudocellate diatoms with internal costae, including comments on the genus Sheshukovia Gleser
FIGURES 87–93. Scanning electron micrographs of Entogoniopsis inflata from San Clemente, California, USA. Fig. 87: oblique external view, showing the depressed valve face centre, with coarse, conspicuously domed areolae. The circumferential furrow adjacent to the expanded mantle margin is indicated by the arrowhead. Arrow indicates one of the furrows associated with the internal costae. Fig. 88: Oblique external view of a valve (V) with attached valvocopula (VC). Fig. 89: Oblique internal view of a specimen with a fractured valvocopula, revealing a cross-section through the fossa embracing the inwardly expanded hyaline margin of the mantle (arrowhead). Fig. 90: Detail of the specimen in Fig. 89, showing the clasping devices on the valvocopula embracing the internal costae (arrow). Fig. 91: Detail of the specimen in Fig. 87, showing the absence of a well-defined pseudocellus at the valve pole, a conspicuously stepped mantle (arrow), and a prominent hyaline margin of the mantle expanded toward the exterior (arrowhead). Fig. 92: Detail of the specimen in Fig. 87, showing the finer areolae located next to the valve face margin. Fig. 93: Detail of the specimen in Fig. 87, showing the coarse, domed areolae on the central part of the valve face.
FIGURES 44–49 in Entogoniopsis gen. nov. and Trilamina gen. nov. (Bacillariophyta): a survey of multipolar pseudocellate diatoms with internal costae, including comments on the genus Sheshukovia Gleser
FIGURES 44–49. Light micrographs showing the range of morphological variation in Entogoniopsis polycistinora. Fig. 44: BM66536, Kamyshlov, Russia. Fig. 45: BM coll. Adams TS748, Kamyshlov, Russia. Fig. 46: BM63692, Kamyshlov, Russia. Fig. 47: BM63691, Kamyshlov, Russia. Fig. 48: BM63693, Barbadoes. Fig. 49: BM61201, Kusnetzk, Russia.
FIGURES 1–5 in Entogoniopsis gen. nov. and Trilamina gen. nov. (Bacillariophyta): a survey of multipolar pseudocellate diatoms with internal costae, including comments on the genus Sheshukovia Gleser
FIGURES 1–5. An overview of valve morphology in Triceratium Ehrenberg sensu stricto and Entogonia Greville. Figs 1–2: Triceratium sp. aff. T. favus Ehrenberg. Fig. 1: Oblique external view showing rows of pseudoloculi on the valve face, marginal rows of rimoportulae (arrowhead), and polar ocelli (arrow). Fig. 2: Oblique internal view, showing internal openings of rimoportulae aligned in marginal rows (arrowhead). Fig. 3: Entogonia sp. Holmes & Brigger, oblique external view of a frustule with attached valvocopula. Note the polar and lateral exit pores of the internal coil, indicated by the arrow and arrowhead, respectively. Fig. 4: Entogonia davyana Greville in external valve view, polar exit pore indicated by the arrow. Fig. 5: Entogonia cloudi Holmes & Brigger, internal valve view, showing a well-preserved internal coil (arrow), and prominent internal costae (arrowhead).
FIGURES 37–43 in Entogoniopsis gen. nov. and Trilamina gen. nov. (Bacillariophyta): a survey of multipolar pseudocellate diatoms with internal costae, including comments on the genus Sheshukovia Gleser
FIGURES 37–43. Scanning electron micrographs of Entogoniopsis polycistinora from Kamyshlov, Russia (Figs 37, 39–43), and Kirgizskoe, Kazakhstan (Fig. 38). Fig. 37: Oblique external view. Location of the ring of rimoportulae indicated by the white arrowhead. Note spinules at the distal faces of the pseudocelli (white arrow). Black arrowhead indicates coarse areolae, and black arrow shows fine areolae in between rows of coarse ones. Fig. 38: Oblique external view of a specimen with a stepped mantle (arrow). Rimoportulae indicated by arrowhead. Fig. 39: Oblique internal view of a specimen with a ring of 14 rimoportulae located on a prominent central area (arrowhead). Fig. 40: Specimen in girdle view. Note the low relative height of the polar elevations, and the location of the hyaline marginal ridge (arrow). Fig. 41: Detail of a fractured valve revealing Tshaped cross-sections of the internal costae (arrowhead). Fig. 42: Detail of the specimen in Fig. 37, showing fractured buttressed external tubes of the rimoportulae. Fig. 43: Detail of the specimen in Fig. 39, showing internal openings of the rimoportulae, in the form of slits across slightly raised papillae. Note well-preserved volae (arrowhead).
FIGURES 17–23 in Entogoniopsis gen. nov. and Trilamina gen. nov. (Bacillariophyta): a survey of multipolar pseudocellate diatoms with internal costae, including comments on the genus Sheshukovia Gleser
FIGURES 17–23. Light micrographs showing the range of morphological variation in Entogoniopsis morlandii. Fig. 17: BM coll. Adams TS315, Oamaru, New Zealand. Fig. 18: BM46565, Oamaru, New Zealand, lectotype. Fig. 19: BM coll. Adams G162, Jackson's Paddock, Oamaru, New Zealand. Fig. 20: BM coll. Adams G142, Oamaru, New Zealand. Fig. 21: BM coll. Adams TS270, Oamaru, New Zealand. Fig. 22: BM coll. Adams G93, no locality on slide label, presumably Oamaru, New Zealand. Fig. 23: BM coll. Adams TS270, girdle view of a frustule with attached valvocopula, Oamaru, New Zealand.
FIGURES 24–30 in Entogoniopsis gen. nov. and Trilamina gen. nov. (Bacillariophyta): a survey of multipolar pseudocellate diatoms with internal costae, including comments on the genus Sheshukovia Gleser
FIGURES 24–30. Scanning electron micrographs of Entogoniopsis grunowii from Vema Cruise 18, Core 112 (Figs 24–25, 27) and Vema Cruise 17, Core 107 (Figs 26, 28–30), South Atlantic Ocean. Fig. 24: Oblique external view. Note the location of the hyaline marginal ridge below the highest level of the valve face (black arrow), and the central ring of rimoportulae (arrowhead). White arrow indicates the furrow above the hyaline margin of the mantle. Fig. 25: Oblique internal view, showing the location of the central ring of rimoportulae (arrowhead), bifurcations of costae on the mantle, and the inwardly expanded hyaline margin of the mantle. White arrow indicates the furrow above the hyaline margin of the mantle. Fig. 26: Detail of the specimen in Fig. 29, showing well-preserved volae. Fig. 27: Detail of the specimen in Fig. 24, showing fractured non-buttressed external tubes of the rimoportulae (arrow). Fig. 28: Detail of the specimen in Fig. 25, showing internal openings of the rimoportulae arranged in a regular ring. Fig. 29: Oblique internal view of a hypovalve with attached valvocopula (VC), and a detached band of the epicingulum showing a fimbriate edge (arrow). Fig. 30: Detail of the specimen in Fig. 29, showing clasping devices that attach the valvocopula to the internal costae (arrow).
FIGURES 230–235 in Entogoniopsis gen. nov. and Trilamina gen. nov. (Bacillariophyta): a survey of multipolar pseudocellate diatoms with internal costae, including comments on the genus Sheshukovia Gleser
FIGURES 230–235. Scanning electron micrographs of Trilamina wittiana from sample AY-12, Java, Indonesia. Fig. 230: Oblique external view of a frustule with preserved valvocopulae (VC), showing the prominent, depressed hyaline areas within each projection. The fracture reveals internal costae (arrow) and the fossa. Fig. 231: Oblique internal view of a specimen with attached fractured valvocopula. A cross-section through the fossa is indicated by the arrow. Fig. 232: Detail of the distal part of a projection in a specimen with attached valvocopula (VC). Note the poorly defined pseudocellus indicated by the arrow. Fig. 233: Detail of a fractured projection revealing the clasping devices on the valvocoupla holding the remnants of internal costae (arrow). Fig. 234: Internal oblique view of a partly dissolved valve, showing clasping devices of the valvocopula (VC) attached to the internal costae (black arrows). Note the single row of poroids on the valvocopula (white arrow), adjacent to the fossa. Fig. 235: Detail of the valve interior, showing the large clasping device attached to the prominent costae along the margin of the central area (arrow).
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