dcsimg

Biology

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P. caciantha is a chain-forming pennate diatom found in tropical waters. It is not a known domoic acid producer. P. caciantha has not been reported in a large monospecific bloom.
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Thessen, Anne
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Thessen, Anne
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Diagnostic Description

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From Lundholm et al. 2003: Overlapping cells in colonies. Cells lanceolate with a tendency to being slightly asymmetrical in apical axis, 2.7-3.5 microns wide, 53-75 microns long. Raphe eccentric, divided in the middle by a central nodule. Fifteen to 19 fibulae in 10 microns, interstriae 28-31 in 10 microns. Striae perforated by one row of poroids, 3.5-5 poroids in 1 micron. Hymen of poroids usually divided into four to five sectors. Valve mantle structured as valve face, 1-2 poroids high. Valvocopula contains 33-38 striae in 10 microns; each stria is two poroids wide and 3-5 poroids high. Striae of the second copula two poroids wide and two poroids high.
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Thessen, Anne
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Thessen, Anne
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Distribution

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Pseudo-nitzschia caciantha has thus far only been reported in tropical waters.
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Thessen, Anne
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Thessen, Anne
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General Description

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P. caciantha form the step-chains characteristic of the genus. Cells are long and thin and slightly asymmetrical in valve view. Each stria contains one row of nearly square poroids with hymen perforations in a hexagonal pattern.
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Thessen, Anne
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Thessen, Anne
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Phylogeny

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Analysis of ITS and ML shows that P. caciantha is most closely related to P. subpacifica and P. calliantha (Lundholm et al. 2002).
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Thessen, Anne
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Thessen, Anne
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Harmful effect

provided by World Register of Marine Species
Domoic acid was detected, but not quantified, in cultures of P. cf. caciantha. The presence of DA was detected by HPLC and LC-MS/MS

Reference

Ha, D.V., Lim, P.T., Ky, P.X., Takata, Y., Teng, S.T., Omura, T., Fukuyo, Y., Kodama, M. (). Diatom Pseudo-nitzschia cf. caciantha (Bacillariophyceae), the most likely source of domoic acid contamination in the Thorny Oyster Spndylus versicolor Schreibers in Nha Phu Bay, Khanh Hoa Province, Vietnam. Asian Fisheries Science.

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WoRMS Editorial Board
bibliographic citation
Ha, D.V., Lim, P.T., Ky, P.X., Takata, Y., Teng, S.T., Omura, T., Fukuyo, Y., Kodama, M. (2014). Diatom Pseudo-nitzschia cf. caciantha (Bacillariophyceae), the most likely source of domoic acid contamination in the Thorny Oyster Spndylus versicolor Schreibers 1979 in Nha Phu Bay, Khanh Hoa Province, Vietnam. <em>Asian Fisheries Science.</em> Ha, D.V., Lim, P.T., Ky, P.X., Takata, Y., Teng, S.T., Omura, T., Fukuyo, Y., Kodama, M. (2014). Diatom Pseudo-nitzschia cf. caciantha (Bacillariophyceae), the most likely source of domoic acid contamination in the Thorny Oyster Spndylus versicolor Schreibers 1979 in Nha Phu Bay, Khanh Hoa Province, Vietnam. <em>Asian Fisheries Science.</em>
contributor
Lundholm, Nina, N.