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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).
FIGURES 125–127 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 125–127. Light micrographs showing the range of morphological variation in Entogoniopsis squamatoportulata. Figs 125–126: SZCZ22057, DSDP sample 29-281-16CC, South Tasman Rise, Southwest Pacific Ocean. Fig. 127: SZCZ21078, holotype, DSDP sample 29-281-16-3, 75–77 cm, South Tasman Rise, Southwest Pacific Ocean.
FIGURES 223–229 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 223–229. Light micrographs showing the range of morphological variation in Trilamina nitescens. Fig. 223: BM63659, Joe's River, Barbadoes. Fig. 224: BM coll. Adams TS694, frustule, Oamaru, New Zealand. Fig. 225: BM63658, Oamaru, New Zealand. Figs 226–227: BM coll. Adams GC3332, Oamaru, New Zealand. Fig. 228: BM3198, Cambridge, Barbadoes, holotype. Fig. 229: BM61164, Oamaru, New Zealand.
FIGURES 185–192 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 185–192. Light micrographs showing the range of morphological variation in Entogoniopsis foveata. Fig. 185: BM68637, Joe's River, Barbadoes (labelled as 'T. lobato-gemmatum'). Fig. 186: BM63574, Joe's River, Barbadoes. Fig. 187: BM61082, Chalky Mount, Barbadoes. Fig. 188: BM3072, Cambridge, Barbadoes, T. foveatum, holotype. Fig. 189: BM66525, Chalky Mount, Barbadoes. Fig. 190: BM37839, Springfield, Barbadoes. Fig. 191: BM coll. Adams TS266, Barbadoes. Fig. 192: BM3044, Barbadoes, T. picturatum, holotype.
FIGURES 149–154 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 149–154. Scanning electron micrographs of Entogoniopsis stokesiana from Pôtor (formerly Szent-Péter), Slovakia (Figs 149, 153–154) and Szurdokpüspöki ('Castel'), Hungary (150–152). Fig. 149: Oblique external view, showing a trifolium in the centre of the valve face. The central ring of rimoportulae is indicated with an arrowhead. Note the deep, stepped mantle (arrow). Fig. 150: Oblique internal view of a valve with four internal costae per side. Note that the more prominent costae are associated with the edges of the trifolium (arrows). The location of the rimoportulae is indicated with an arrowhead. Fig. 151: Detail of the central area, showing the external tubes of the rimoportulae bearing thickened rims, and granules scattered on the valve face (arrow). Note the well-preserved slightly sunken cribra, and the diminished size of areolae next to the rimoportulae. Fig. 152: Detail of the specimen in Fig. 150, showing the internal openings of the rimoportulae, in the form of a slit between slightly raised lips. Note the smaller areolae located next to the rimoportulae, and the well-preserved cribra. Fig. 153: Detail of a pseudocellus. Fig. 154: Oblique external view of a specimen with a detached girdle element, probably a copula (C?).
FIGURES 120–124 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 120–124. Scanning electron micrographs of Entogoniopsis squamatoportulata from Vema Cruise 17, Core 107, South Atlantic Ocean. Fig. 120: Internal valve view, showing the location of the central ring of 17 rimoportulae (arrow). Fig. 121: Detail of the specimen in Fig. 120, showing the internal openings of the rimoportulae in the form of short slits across slightly raised papillae. Fig. 122: Oblique internal view, showing the depressed centre of the valve face, and the complex pattern of internal costae in the marginal part of the valve face and on the mantle. Fig. 123: Detail of the prominent pseudocellus. Note the well-preserved volae within the areolae. Fig. 124: Detail of the pattern formed by the internal costae. Note the inwardly expanded, smooth hyaline margin of the mantle (arrow).
FIGURES 117–119 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 117–119. Reproductions of original line drawings from Pantocsek (1889). Fig. 117: Entogonia tschestnovii Pantocsek (1889: pl. II, fig. 24). Fig. 118: Triceratium squamatum Pantocsek (1889: pl. IX, fig. 164). Fig. 119: Entogonia truanii Pantocsek (1889: pl. XIII, fig. 223). Relative scale retained.
FIGURES 114–116 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 114–116. Light micrographs showing the range of morphological variation in Entogoniopsis squamata. Fig. 114: BM coll. Adams H335, Kusnetzk, Russia. Fig. 115: BM coll. Adams GC3416, Barbadoes. Fig. 116: BM101699, dredging DODO-123-D1, Mascarene Ridge, Indian Ocean.
FIGURES 108–113 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 108–113. Scanning electron micrographs of Entogoniopsis squamata from dredging DODO-123-D1, Mascarene Ridge, Indian Ocean. Fig. 108: Oblique external view, showing the conspicuously depressed valve face. Note the rows of areolae on the mantle becoming slightly divergent closer to the poles. Fig. 109: Oblique internal view, showing the depressed valve face and rows of marginal internal costae. Note the sparser areolation within the central area (arrow). Fig. 110: Valve (V) with attached valvocopula (VC) in girdle view. Note the hyaline marginal ridge level with the summits of the polar elevations (arrow). Fig. 111: Detail of the specimen in Fig. 109, showing the pattern of loops ('scales' in Pantocsek's description) formed by the internal costae, and the inwardly expanded hyaline mantle margin. Fig. 112: Oblique internal view of the specimen in Fig. 110, showing the valvocopula attached to the valve by means of clasping devices embracing the internal costae (arrow). Fig. 113: Detail of the specimen in Fig. 110, showing arrowhead-shaped clasping devices.
FIGURES 94–96 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 94–96. Light micrographs showing the range of morphological variation in Entogoniopsis inflata. Fig. 94: BM2873, Cambridge, Barbadoes, holotype; Fig. 95: SZCZ17945B, ODP sample 171B-1051A-8H-5, 36–37 cm, Blake Nose, western North Atlantic Ocean; Fig. 96: Academy of Natural Sciences of Philadelphia slide SchAR3460, Barbadoes, holotype of Biddulphia inflata var. recta Boyer. Micrograph by Jonathan English.
FIGURES 102–107 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 102–107. Light micrographs showing the range of morphological variation in Entogoniopsis major. Fig. 102: BM coll. Adams G614, Allan's Farm, Oamaru, New Zealand. Fig. 103: BM37916, Forrester's, Oamaru, New Zealand. Fig. 104: BM coll. Adams G89, Allan's Farm, Oamaru, New Zealand. Fig. 105: BM46554, Oamaru, New Zealand, holotype. Fig. 106: BM37914, Forrester's, Oamaru, New Zealand. Fig. 107: BM coll. Adams G28, Oamaru, New Zealand.
FIGURES 97–101 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 97–101. Scanning electron micrographs of Entogoniopsis major from Oamaru, New Zealand. Fig. 97: Oblique external view of a hypovalve with a displaced epicingulum element (C? = copula?). Note the thickenings on the depressed part of the valve face. Fig. 98: Detail of the specimen in Fig. 99, showing poorly preserved clasping devices of the valvocopula attached to the internal costae. Fig. 99: Oblique internal view of a specimen with remnants of the valvocopula attached (arrow). Fig. 100: Girdle view of a specimen with a valvocopula attached (VC). Fig. 101: Oblique internal view of the specimen in Fig. 100, revealing well-preserved clasping devices embracing the internal costae (arrow), and a fossa holding the inward expansion of the mantle margin (arrowhead).
FIGURES 52–57 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 52–57. Scanning electron micrographs of Entogoniopsis venosa from Joe's River, Barbadoes (Figs 52, 54, 56), and Oamaru, New Zealand (Figs 53, 55, 57). Fig. 52: Oblique external view, central rimoportula indicated by arrow. Fig. 53: Oblique internal view. Note the internal opening of the rimoportula indicated by arrow. Fig. 54: Detail of the specimen in Fig. 52, showing a small depression around the fractured external tube of the rimoportula. Fig. 55: Detail of the specimen in Fig. 53, showing the internal opening of the rimoportula in the form of a slightly raised slit. Note the prominent costae radiating from the rimoportula. Fig. 56: Detail of the specimen in Fig. 52, showing the hyaline marginal ridge, and the mantle, with external thickenings on the part adjacent to the valve face, associated with the internal costae (arrows). Fig. 57: Detail of the specimen in Fig. 53, showing the internal costae and the hyaline mantle margin, with a slight inward expansion.
FIGURES 69–75 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 69–75. Scanning electron micrographs of Entogoniopsis novazealandica from Oamaru, New Zealand. Fig. 69: Oblique external view, showing the depressed valve face centre. Fig. 70: Detail of a hemispherical pseudocellus. Fig. 71: Oblique internal view of the specimen in Fig. 69. Note the absence of rimoportulae within the central depression. Arrow indicates a transverse costa next to the proximal side of a polar elevation. Fig. 72: Oblique external view of a specimen with a circumferential raised sector adjacent to the central depression. Fig. 73: Girdle view of a specimen with highly elevated polar pseudocelli. Note the offset of the polar elevations from the valve margin. Fig. 74: Oblique view of a specimen with attached valvocopula. Note clasping devices indicated by arrows. Fig. 75: Detail of the valvocopula attachment, with two clasping devices embracing internal costae visible. Arrow indicates the fossa, attached to the inwardly expanded hyaline margin of the mantle.
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