Filament formation in the diatomSkeletonema costatum

Housley, Harold L.; Scheetz, Raymond W.; Pessoney, George F.

doi:10.1007/bf01287485

Cited by 10 publications

(3 citation statements)

References 3 publications

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“…Description: The general morphological features of Skeletonema species examined in this investigation (Fig. 1) generally coincide with those illustrated in previous descriptions of the genus (Castellví 1971, Hasle 1973, Round 1973, Housley et al 1975, Fryxell 1976, Smith 1981, Round et al 1990). With the exception of S. menzelii , all form colonies of variable length, generally straight, sometimes curved or coiled (Fig.…”

supporting

confidence: 87%

DIVERSITY IN THE GENUS SKELETONEMA (BACILLARIOPHYCEAE). II. AN ASSESSMENT OF THE TAXONOMY OF S. COSTATUM‐LIKE SPECIES WITH THE DESCRIPTION OF FOUR NEW SPECIES¹

Sarno

Kooistra

Medlin

et al. 2005

Journal of Phycology

345

302

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The morphology of strains of Skeletonema Greville emend Sarno et Zingone was examined in LM, TEM, and SEM and compared with sequence data from nuclear small subunit rDNA and partial large subunit rDNA. Eight distinct entities were identified, of which four were known: S. menzelii Guillard, Carpenter et Reimann; S. pseudocostatum Medlin emend. Zingone et Sarno; S. subsalsum (Cleve) Bethge; and S. tropicum Cleve. The other four species were new: S. dohrnii Sarno et Kooistra sp. nov., S. grethae Zingone et Sarno sp. nov., S. japonicum Zingone et Sarno sp. nov., and S. marinoi Sarno et Zingone sp. nov. Skeletonema species fell into four morphologically distinct groups corresponding to four lineages in the small subunit and large subunit trees. Lineage I included S. pseudocostatum, S. tropicum, S. grethae, and S. japonicum. All have external processes of the fultoportulae with narrow tips that connect with those of sibling cells via fork‐, knot‐, or knuckle‐ like junctions. Lineage II included only the solitary species S. menzelii. Lineage III comprised S. dohrnii and S. marinoi. This latter pair have flattened and flared extremities of the processes of the fultoportulae, which interdigitate with those of contiguous valves without forming knots or knuckles. Lineage IV only contained the brackish water species S. subsalsum. Some species also differ in their distribution and seasonal occurrence. These findings challenge the concept of S. costatum as a single cosmopolitan and opportunistic species and calls for reinterpretation of the vast body of research data based on this species.

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supporting

confidence: 87%

DIVERSITY IN THE GENUS SKELETONEMA (BACILLARIOPHYCEAE). II. AN ASSESSMENT OF THE TAXONOMY OF S. COSTATUM‐LIKE SPECIES WITH THE DESCRIPTION OF FOUR NEW SPECIES¹

Sarno

Kooistra

Medlin

et al. 2005

Journal of Phycology

345

302

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“…The morphology of the winter stage shows the same kind of relationship of the valves as seen in the temperate coastal diatom Skeletonema costatum Cleve (Housley et al, 1975) in that the valves abut directly with the girdle bands overlapping the hypovalve until cell division. The bands themselves are diaphanous in both cases, in contrast to the more heavily silicified valves (Fryxell, 1976).…”

Section: Discussionmentioning

confidence: 66%

Comparison of Winter and Summer Growth Stages of the Diatom Eucampia antarctica from the Kerguelen Plateau and South of the Antarctic Convergence Zone

Fryxell¹

1991

Proceedings of the Ocean Drilling Program

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On ODP Leg 119, specimens collected of Eucampia antarctica (Castracane) Mangin var. antarctica exhibited morphological and distribution patterns that contrasted with those of Eucampia antarctica var. recta (Mangin) G. Fryxell et Prasad. E. antarctica var. antarctica was found over the northern Kerguelen Plateau, north of the summer Antarctic Convergence Zone, in the subpolar plankton and in the sediments. E. antarctica var. recta was found close to the continent in Prydz Bay. It was also collected near and under the ice in the northern Weddell Sea on a National Science Foundation Division of Polar Programs project (1983)(1984)(1985)(1986)(1987)(1988).A key feature for distinguishing the two varieties in the field is the growth habit, with curvature in broad girdle view of the nominate, subpolar variety in both the winter stage and the more lightly silicified summer stage. A low ratio of terminal to intercalary valves results from the repeated division of the original doublets into chains of considerable length of the winter stage. Small spines around the elevations of one valve serve to clasp the sibling valve and maintain the chain formation. Cells of E. antarctica var. recta tend to be somewhat larger than E. antarctica var. antarctica, and they form chains that are straight in broad girdle view but slightly curved in narrow girdle view. There are no spines on an elevation of the valve, and a hyaline ring surrounds the pore field, forming a costate ocellus in the winter.This truly polar variety shows less growth in the winter stage, with a higher ratio of terminal to intercalary valves in Prydz Bay than that of the nominate variety from the subpolar regions over the Kerguelen Plateau.

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“…Many diatom species form chains or colonies usually by means of interlocking siliceous projections of the shell (Busch, 1974;Housely et al, 1975), but fusiforms and triradiate cells of P. tricornutum form long chains by fusion of the cell wall during the cell wall deposition (Borowitzka et al, 1977). C. fusiformis is very similar to the fusiform and triradiate forms of P. tricornutum with an extensive organic cell wall, the raphe and the girdle bands of which are the sole siliceous structures (Borowitzka & Volcani, 1978).…”

Section: Discussionmentioning

confidence: 99%

Preliminary studies on the colonial form of Cylindrotheca sp. (Bacillariophyceae)

Li¹,

Bian²

1985

Hydrobiologia

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From a stock culture of Cylindrotheca sp., non-motile colony-forming cells were observed and isolated. Colony-forming cells produced both single cells and colony-forming cells in liquid media, the rate of single cell production varied among clones. The single cells derived from colony-forming cells were also isolated, which were able to produce both colony-forming cells and single cells in liquid media. The cells derived from colony-forming cells never moved on the agar surface.

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Filament formation in the diatomSkeletonema costatum

Cited by 10 publications

References 3 publications

DIVERSITY IN THE GENUS SKELETONEMA (BACILLARIOPHYCEAE). II. AN ASSESSMENT OF THE TAXONOMY OF S. COSTATUM‐LIKE SPECIES WITH THE DESCRIPTION OF FOUR NEW SPECIES¹

DIVERSITY IN THE GENUS SKELETONEMA (BACILLARIOPHYCEAE). II. AN ASSESSMENT OF THE TAXONOMY OF S. COSTATUM‐LIKE SPECIES WITH THE DESCRIPTION OF FOUR NEW SPECIES¹

Comparison of Winter and Summer Growth Stages of the Diatom Eucampia antarctica from the Kerguelen Plateau and South of the Antarctic Convergence Zone

Preliminary studies on the colonial form of Cylindrotheca sp. (Bacillariophyceae)

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Filament formation in the diatomSkeletonema costatum

Cited by 10 publications

References 3 publications

DIVERSITY IN THE GENUS SKELETONEMA (BACILLARIOPHYCEAE). II. AN ASSESSMENT OF THE TAXONOMY OF S. COSTATUM‐LIKE SPECIES WITH THE DESCRIPTION OF FOUR NEW SPECIES1

DIVERSITY IN THE GENUS SKELETONEMA (BACILLARIOPHYCEAE). II. AN ASSESSMENT OF THE TAXONOMY OF S. COSTATUM‐LIKE SPECIES WITH THE DESCRIPTION OF FOUR NEW SPECIES1

Comparison of Winter and Summer Growth Stages of the Diatom Eucampia antarctica from the Kerguelen Plateau and South of the Antarctic Convergence Zone

Preliminary studies on the colonial form of Cylindrotheca sp. (Bacillariophyceae)

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DIVERSITY IN THE GENUS SKELETONEMA (BACILLARIOPHYCEAE). II. AN ASSESSMENT OF THE TAXONOMY OF S. COSTATUM‐LIKE SPECIES WITH THE DESCRIPTION OF FOUR NEW SPECIES¹

DIVERSITY IN THE GENUS SKELETONEMA (BACILLARIOPHYCEAE). II. AN ASSESSMENT OF THE TAXONOMY OF S. COSTATUM‐LIKE SPECIES WITH THE DESCRIPTION OF FOUR NEW SPECIES¹