@article {181,
	title = {A study of the Pseudo-nitzschia pseudodelicatissima/cuspidata complex (Bacillariophyceae): What is P. pseudodelicatissima?},
	journal = {Journal of Phycology},
	volume = {39},
	number = {4},
	year = {2003},
	note = {Times Cited: 1ArticleEnglishCited References Count: 64706jt},
	month = {AUG},
	pages = {797-813},
	abstract = {Based on morphological variation found in specimens ascribed to Pseudo-nitzschia pseudodelicatissima and uncertainty regarding the delineation of P. pseudodelicatissima and P. cuspidata , cultures and field material of diatoms in the P. pseudodelicatissima/cuspidata complex were studied in morphological detail. Four different species were identified. The descriptions of the species P. pseudodelicatissima and P. cuspidata were emended on the basis of studies of type material. In addition, P. calliantha sp. nov. and P. caciantha sp. nov. were described as new species based on morphological and molecular data. The morphological differences among the species were found in characters such as width and shape of the valve, density of fibulae and striae, structural pattern of the poroid hymen, and structure of the girdle bands. The morphological studies were supported by phylogenetic analyses of the nuclear-encoded internal transcribed spacer 1, 5.8S, and internal transcribed spacer 2 rDNA of 24 strains representing 16 different Pseudo-nitzschia species. The description of the four species helps to explain the variation observed in mating experiments on cultures originally designated as P. pseudodelicatissima . At least two previous reports of toxin production in species identified as P. pseudodelicatissima have been identified as being caused by P. calliantha , and one additional report of toxin production has been identified as either P. pseudodelicatissima or P. cuspidata .},
	keywords = {bacillariaceae, diatom, diatoms, domoic acid, maximum-likelihood, morphology, multiseries, nuclear ribosomal DNA, p-pseudodelicatissima, phylogeny, pseudo-nitzschia caciantha, pseudo-nitzschia calliantha, pseudo-nitzschia cuspidata, pseudo-nitzschia pseudodelicatissima, rna, sequences, taxonomy, waters},
	url = {<Go to ISI>://000184451100016},
	author = {Lundholm, N. and Moestrup, {\O}. and Hasle, G. R. and Hoef-Emden, K.}
}
@article {182,
	title = {Inter- and intraspecific variation of the Pseudo-nitzschia delicatissima complex (Bacillariophyceae) illustrated by rRNA probes, morphological data and phylogenetic analyses},
	journal = {Journal of Phycology},
	volume = {42},
	number = {2},
	year = {2006},
	note = {Times Cited: 0ArticleEnglishCited References Count: 73029go},
	month = {APR},
	pages = {464-481},
	abstract = {A study of 25 cultures tentatively identified as Pseudo-nitzschia delicatissima (Cleve) Heiden, and originating from geographically widely distributed locations, showed both morphological and genetic variation among strains. Use of rRNA-targeted DNA probes on 17 different strains showed large variation in the hybridization patterns. Detailed morphological studies placed the isolates into three groups. The sample on which the neotype of P. delicatissima is based was also examined, and used to establish the morphological identity of P. delicatissima. Phylogenetic analyses of 16 strains, based on sequences of internal transcriber spacer 1 (ITS1), 5.8S and ITS2 of the nuclear-encoded rDNA, supported the morphological observations and the hybridization studies, and revealed large genetic variation among strains. A combination of the morphological and molecular findings resulted in the description of two new species, P. decipiens sp. nov. and P. dolorosa sp. nov. P. dolorosa has a mixture of one or two rows of poroids in the striae whereas P. delicatissima always has two rows. In addition, P. dolorosa has wider valves and a lower density of poroids. P. decipiens differs from P. delicatissima by a higher density of striae on the valve face as well as a higher density of poroids on the girdle bands. Among the strains referred to P. delicatissima, an epitype was selected. Large genetic variation was found among the P. delicatissima strains and a subdivision into two major clades represent cryptic species.},
	keywords = {bacillariaceae, cryptic diversity, diatom ditylum-brightwellii, diatoms, diversity, DNA, domoic acid production, genetic differentiation, intraspecific, its rdna, morphology, multiseries bacillariophyceae, p. decipiens, p. dolorosa, phylogeny, probes, pseudo-nitzschia delicatissima, skeletonema-costatum bacillariophyceae, sp-nov, targeted fluorescent-probes, taxonomy, whole-cell hybridization},
	url = {<Go to ISI>://000236549100019},
	author = {Lundholm, N. and Moestrup, {\O}. and Kotaki, Y. and Hoef-Emden, K. and Scholin, C. and Miller, P.}
}
