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47 results for “Trilamina”
FIGURES 199–204 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 199–204. Light micrographs showing the range of morphological variation in Entogoniopsis tabellaria. Figs 199, 201: BM63765, Manila, Philippine Islands. Fig. 200: BM63761, Colón, Panama. Fig. 202: BM coll. Adams TS543, Jérémie, Haiti (label on slide: 'Triceratium grave'). Fig. 203: BM coll. Adams TS451, Tamatave, Madagascar (label on slide: 'T. grave'). Fig. 204: BM coll. Adams TS582, Maria Madre Island, Mexico (slide label reads: 'Biddulphia riedyi').
FIGURES 249–252 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 249–252. Light micrographs of some of the new combinations proposed in this study. Fig. 249: BM63779, Trilamina tripes, Joe's River, Barbadoes. Fig. 250: BM2763, Trilamina denticulata, Cambridge, Barbadoes, holotype. Slide thickness prevents Köhler illumination. Fig. 251: BM2111, Trilamina rotundata, Barbadoes, holotype. Slide thickness prevents Köhler illumination. Fig. 252: BM3078, Trilamina obesa, Cambridge, Barbadoes, holotype.
FIGURES 243–248 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 243–248. Light micrographs showing the range of morphological variation in Trilamina westiana. Fig. 243: BM52820, Barbadoes. Slide thickness prevents Köhler illumination. Fig. 244: BM coll. Adams GC3466, Springfield, Barbadoes. Fig. 245: BM2029, Barbadoes, holotype. Slide thickness prevents Köhler illumination. Fig. 246: BM coll. Adams F1414, Barbadoes. Fig. 247: BM coll. Adams J4252, Springfield, Barbadoes. Fig. 248: BM coll. Adams F1413, Newcastle, Barbadoes.
FIGURES 239–242 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 239–242. Scanning electron micrographs of Trilamina westiana from dredging DODO-123-D1, Mascarene Ridge, Indian Ocean. Fig. 239: Flat internal view of a specimen with an attached valvocopula. Internal opening of the rimoportula indicated by arrow. Fig. 240: Oblique internal view of the specimen in Fig. 239, showing valve face undulations, and the large clasping devices on the valvocopula (VC; arrowhead). Fig. 241: Detail of the specimen in Fig. 239, showing the areolation pattern within one of the projections. Note the poorly defined pseudocellus in the lower left corner (arrow). Fig. 242: Detail of the specimen in Fig. 239, showing the central area, with a single rimoportula located slightly off-centre (arrow).
FIGURES 217–222 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 217–222. Scanning electron micrographs of Trilamina nitescens from Oamaru, New Zealand. Fig. 217: Oblique external view of a valve with attached valvocopula (VC). Fig. 218: Detail of the specimen in Fig. 217, showing the hyaline depressed sectors next to the valve centre. Arrow points to a poroid which might represent an external opening of a rimoportula. Fig. 219: Detail of the specimen in Fig. 217, showing the inconspicuous polar pseudocellus (arrowhead). Fig. 220: Flat internal view of a specimen with an attached valvocopula. Internal opening of the rimoportula is indicated by the white arrow. Arrowhead points to the prominent, tapering costa on the underside of the depressed area. Black arrow indicates the costa associated with the margin of the valve centre. Fig. 221: Oblique internal view of the specimen in Fig. 220, showing the differentiated clasping devices on the valvocopula. Large clasping mechanism is indicated by the arrowhead; small clasping mechanism is indicated by the white arrow. Note that the possible pseudocelli are bound by costae on the interior (black arrows). Fig. 222: Detail of the small clasping devices attached to the internal costae in the distal part of one of the projections.
FIGURES 236–238 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 236–238. Light micrographs showing the range of morphological variation in Trilamina wittiana. Fig. 236: BM36216, Java, Indonesia (label reads: 'Reinhold sample AY-12'). Fig. 237: BM63802, Java, Indonesia. Fig. 238: BM63801, Jérémie, Haiti.
FIGURES 205–211 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 205–211. Scanning electron micrographs of Entogoniopsis? sp. from Szurdokpüspöki ('Castel'), Hungary. Fig. 205: Oblique external view of a short chain. Note the prominent, curved linking spine preserved on the lower pole (arrow), and the lack of external openings of the rimoportulae within the central area. VC: valvocopula, C: copula. Fig. 206: Internal view of the central area, showing the internal openings of the rimoportulae. Fig. 207: Oblique internal view of the sibling valve, showing the location of the rimoportulae within the central area (arrowhead), and a series of prominent internal costae along the valve margin (arrow). Fig. 208: Detail of the poles, tightly linked by hooked linking spines. Fig. 209: Girdle view of a short chain showing additional interlocking linking devices along the crest of the marginal ridge (arrows). Note that the valve to the right of the micrograph differs in structure of the marginal ridge. Arrowhead indicates polar linking spines. Fig. 210: Detail of the sibling valves, showing the interlocking linking devices along the crest of the marginal ridge. Fig. 211: Detail of a polar elevation, showing a cross-section through a fractured spine (arrowhead).
FIGURES 177–178 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 177–178. Light micrographs of Entogoniopsis kempii. Figs 177–178: BM101700, dredging DODO-123-D1, Mascarene Ridge, Indian Ocean. Specimen in Fig. 177 is the holotype.
FIGURES 179–184 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 179–184. Scanning electron micrographs of Entogoniopsis foveata from Barbadoes. Fig. 179: External view of a specimen with fractured pseudocelli. Arrow points to the location of the central areola. Fig. 180: Internal view of a hypovalve with attached valvocopula and a displaced band of the epicingulum. Arrow indicates the location of the central areola. Fig. 181: Oblique external view of the specimen in Fig. 179. Note the fractures on the mantle revealing the internal costae (arrows). Fig. 182: Detail of the specimen in Fig. 180 showing the interior of the trifolium. Note well-preserved cribra visible on the underside of the depressed sector (arrowhead), and the absence of an internal slit in association with the central areola. Fig. 183: Detail of the specimen in Fig. 180, showing the girdle elements: attached valvocopula (VC) and the detached copula or pleura (C/P?). Arrow indicates one of the clasping devices that link the valvocopula to the internal costae. Fig. 184: Detail of the specimen in Fig. 180, showing the hyaline pars interior of the displaced girdle element (arrow), and the step on the mantle (arrowhead). Note well-preserved cribra visible on the mantle (black arrow).
FIGURES 168–170 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 168–170. Light micrographs showing the range of morphological variation in Entogoniopsis gleseri. Figs 168–170: BM101699, dredging DODO-123-D1, Mascarene Ridge, Indian Ocean. Specimen in Fig. 170 is the holotype.
FIGURE 253 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
FIGURE 253. Cladogram showing the relationships amongst Entogonia, Medlinia, Entogoniopsis and Trilamina; Triceratium and Sheshukovia are placed in a basal position as neither are demonstrably monophyletic and no characters are presented to relate them more closely to other genera considered here. Numerals represent characters (synapomorphies) defined in Table 1. The cladogram includes Characters 1, 2, 3, 7 and 8. Excluded characters are: presence or absence of rimoportulae (Character 4), which are absent only in Entogonia, hence it is an automorphy for that genus (notwithstanding the occurrence, or lack of, in Entogoniopsis and Trilamina); location of rimoportulae (Character 5) is too variable to suggest direct relationships (with the exception of Medlinia and Sheshukovia, which suggests that a sub-marginal location is most likely plesiomorphic; mantle margin (Character 6), is serrated only in Medlinia, hence it is an automorphy for that genus.
FIGURES 212–216 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 212–216. Light micrographs of some of the new combinations proposed in this study. Fig. 212: BM63525, Entogoniopsis dutertrei, Kusnetzk, Russia. Fig. 213: BM37991, Entogoniopsis pseudonervata, Oamaru, New Zealand. Fig. 214: ANSP slide SchAR3461, Entogoniopsis curvinervia, Barbadoes, holotype. Micrograph by Jennifer Beals. Fig. 215: BM63762, Entogoniopsis curvicostata, Joe's River, Barbadoes (label reads: 'Triceratium pallidum'). Fig. 216: BM37989, Entogoniopsis truncata, Springfield, Barbadoes.
FIGURES 171–176 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 171–176. Scanning electron micrographs of Entogoniopsis kempii from dredging DODO-123-D1, Mascarene Ridge, Indian Ocean. Fig. 171: Oblique external view, showing the pattern of valve face undulations. Note the flat summits of the polar elevations, distinctly cut off from the remainder of the valve face by the rugged hyaline marginal ridge (arrow). Location of the rimoportulae is indicated by arrowhead. Fig. 172: Oblique internal view, showing a series of prominent internal costae along each margin. Rimoportulae are indicated by arrowhead. Fig. 173: External view of the valve face, showing five inconspicuous rimoportulae located in the central part of the trifolium (arrows). Fig. 174: Internal view of the central area, showing nine rimoportulae with slightly raised internal openings (arrow). Fig. 175: Detail of a polar elevation, showing a flat summit, and a fractured pseudocellus located on the distal face of the elevation. Fig. 176: Detail of the mantle, showing an inwardly expanded margin (arrow), and robust internal costae.
FIGURES 155–160 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 155–160. Light micrographs showing the range of morphological variation in Entogoniopsis stokesiana. Figs 155 and 160: BM63749, Hungary. Figs 156–157: BM63751, Szakal, Hungary. Note valve face thickenings indicated by arrowheads in Fig. 156. Fig. 158: BM63750, Hungary. Fig. 159: BM coll. Adams TS741, Castel, Hungary.
FIGURES 161–167 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 161–167. Scanning electron micrographs of Entogoniopsis gleseri from dredging DODO-123-D1, Mascarene Ridge, Indian Ocean. Fig. 161: External valve view of a specimen with multiple prominent external tubes of rimoportulae (arrow). Fig. 162: Oblique external view of the specimen in Fig. 161, showing a distinct central trifolium on the valve face, and an attached valvocopula (VC). Fig. 163: Detail of a polar elevation, showing a pseudocellus on the flat summit, and on the distal face. Fig. 164: Internal view of the mantle, showing the inconspicuous internal costae (arrows). Fig. 165: Oblique internal view of a specimen with two rimoportulae, and an attached valvocopula (VC). Arrows indicate the internal openings of the rimoportulae. Fig. 166: Detail of the specimen in Fig. 165, showing clasping devices attached to internal costae. Fig. 167: Detail of the specimen in Fig. 162, showing the long, non-buttressed external tubes of the rimoportulae.
FIGURES 193–198 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 193–198. Scanning electron micrographs of Entogoniopsis tabellaria from Joe's River (Figs 193, 195) and Conset (Fig. 197), Barbadoes, and Maria Madre Island, Mexico (Figs 194, 196, 198). Fig. 193: Oblique external view of a specimen with convex summits of the polar elevations. Note the well-preserved domed vela. Arrowhead points to the inconspicuous hyaline marginal ridge. Arrow indicates the slight outward expansion of the hyaline mantle margin. Fig. 194: Oblique external view of a specimen with flat summits of the polar elevations, and displaced girdle elements preserved. Fig. 195: Detail of the specimen in Fig. 193, showing well-preserved rotae within the porelli of the pseudocellus, and domed cribra occluding the areolae. Fig. 196: Detail of the specimen in Fig. 194, showing a detail of the polar pseudocellus, distinctly cut off from the adjacent depressed sector, and the detached girdle elements, which likely represent copulae (C and C?). Fig. 197: Oblique internal view, showing the internal costae and the inwardly expanded mantle margin (arrowhead). Fig. 198: Internal view of a specimen with attached valvocopula (VC), and a preserved displaced copula (C). Arrowhead points to one of the clasping devices linking the valvocopula to the internal costae.
FIGURES 136–141 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 136–141. Scanning electron micrographs of quadrate Entogoniopsis lineolata from DSDP Site 6, Bermuda Rise, western North Atlantic Ocean (Figs 136–137, 139–141) and Joe's River, Barbadoes (Fig. 138). Fig. 136: Oblique external view of a fractured specimen revealing a poroid valve structure. Arrow indicates the location of the central ring of rimoportulae. Fig. 137: Oblique internal view of the specimen in Fig. 136. Rimoportulae are indicated by arrow. Arrowhead shows small tubercles on the hyaline marginal ridge. Fig. 138: Oblique internal view of a small specimen. Note the tubercles on the hyaline marginal ridge (arrowhead). Fig. 139: Detail of the specimen in Fig. 136, showing a well-preserved pseudocellus, granules on the mantle (arrow), and poorly preserved spinules on the valve face (arrowhead). Fig. 140: Detail of the specimen in Fig. 136, showing a cross-section through poroid arolae, and fractured short external tubes of the rimoportulae. Fig. 141: Detail of the internal openings of the rimoportulae on the specimen in Figs 136–137.
FIGURES 142–144 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 142–144. Light micrographs of Entogoniopsis lineolata versus Triceratium quadratum Greville and Biddulphia quadrans Boyer. Fig. 142: BM2743, E. lineolata, Cambridge, Barbadoes, holotype. Slide thickness prevents Köhler illumination. Fig. 143: BM3263, T. quadratum, Cambridge, Barbadoes, syntype. Slide thickness prevents Köhler illumination. Fig. 144: ANSP slide SchAR3459, B. quadrans, Barbadoes, holotype. Micrograph by Jennifer Beals.
FIGURES 145–148 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 145–148. Light micrographs of Entogoniopsis lineolata. Fig. 145: BM coll. Adams F1403, Cambridge, Barbadoes; label reads: 'Triceratium turgidum'. Fig. 146: BM coll. Adams GC3448, Springfield, Barbadoes; label reads: 'T. turgidum'. Fig. 147: BM coll. Adams TS929, Joe's River, Barbadoes; label reads: 'T. turgidum'. Fig. 148: BM coll. Adams GC3447, Barbadoes; label reads: 'T. turgidum var. quadrata A.S.'
FIGURES 128–135 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 128–135. Scanning electron micrographs of tripolar Entogoniopsis lineolata from dredging DODO-123-D1, Mascarene Ridge, Indian Ocean. Fig. 128: External valve view. Location of rimoportulae indicated by arrow. Note spinules arranged in irregular rings on the valve face (arrowhead). Fig. 129: Detail of a polar elevation summit, showing a fractured pseudocellus. Fig. 130: Oblique external view of the specimen in Fig. 128. Note the convexity of the valve face and small thickenings on the hyaline marginal ridge (arrow). Fig. 131: Oblique internal view. Note the irregular ring of rimoportulae, indicated by arrow. Fig. 132: Detail showing a series of marginal internal costae, and a slight inward expansion of the hyaline margin of the mantle (arrowhead). Fig. 133: Detail of the specimen in Fig. 131, showing fractured, non-buttressed external tubes of the rimoportulae, arranged in an irregular ring. Note the spinules, indicated by the arrowhead. Fig. 134: Detail showing internal openings of the rimoportulae, arranged in an irregular ring. Fig. 135: Detail of the mantle, showing elongated areolae immediately below the hyaline marginal ridge (arrow), and rows of granules located between the rows of areolae (arrowhead).
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