Studies on woloszynskioid dinoflagellates III:: on the ultrastructure and phylogeny of Borghiella dodgei gen. et sp nov., a cold-water species from Lake Tovel, N. Italy, and on B-tenuissima comb. nov (syn. Woloszynskia tenuissima)

Øjvind Moestrup; Gert Hansen; Niels Daugbjerg

doi:10.2216/07-32.1

Studies on woloszynskioid dinoflagellates III: on the ultrastructure and phylogeny of Borghiella dodgei gen. et sp nov., a cold-water species from Lake Tovel, N. Italy, and on B-tenuissima comb. nov (syn. Woloszynskia tenuissima)

Øjvind Moestrup, Gert Hansen, Niels Daugbjerg

Freshwater Biology

55 Citations (Scopus)

Abstract

Using ultrastructure and nuclear-encoded large subunit (LSU) rDNA sequences, the woloszynskioid dinoflagellates have been shown recently to form a polyphyletic assemblage. The first group comprises the family Tovelliaceae, with the genera Tovellia and Jadwigia. The present manuscript describes the second group, comprising Borghiella dodgei gen. et sp. nov. from the Italian Alps. The new genus differs in a number of ultrastructural features, of which the most important are the structure of the eyespot (type B sensu Moestrup & Daugbjerg) and the structure of the apical part of the cell. The resting cyst is smooth, in contrast to the cysts of other woloszynskioids such as Tovellia and some species of Woloszynskia. The new species has been previously confused with Tovellia sanguinea, which was responsible for colouring the water of Lake Tovel, in the Italian Alps, blood-red up to 1964. However, B. dodgei may form brown, never truly red blooms as in the case of T. sanguinea. The transverse flagellum of Borghiella carries, in addition to thin hairs found also in other dinoflagellates, a row of shorter, thicker hairs resembling the curly hairs on the homologous, anterior flagellum of the perkinsid Parvilucifera but apparently not observed in any other dinoflagellates. Woloszynskia tenuissima, a well-known cold-water dinoflagellate, has been re-examined using material isolated from Greenland. Based on partial LSU rDNA sequencing it is shown to be related to R dodgei (sequence divergence only 1.1%) and is transferred to this genus as B. tenuissima comb. nov. We agree with the observations of von Stosch that the cysts of this species are spherical and smooth, in contrast to what was mentioned in the original description by Woloszynska.

Original language	English
Journal	Phycologia
Volume	47
Issue number	1
Pages (from-to)	54-78
Number of pages	15
ISSN	0031-8884
DOIs	https://doi.org/10.2216/07-32.1
Publication status	Published - 2008

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Studies on woloszynskioid dinoflagellates III: on the ultrastructure and phylogeny of Borghiella dodgei gen. et sp nov., a cold-water species from Lake Tovel, N. Italy, and on B-tenuissima comb. nov (syn. Woloszynskia tenuissima). / Moestrup, Øjvind ; Hansen, Gert ; Daugbjerg, Niels.
In: Phycologia, Vol. 47, No. 1, 2008, p. 54-78.

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title = "Studies on woloszynskioid dinoflagellates III:: on the ultrastructure and phylogeny of Borghiella dodgei gen. et sp nov., a cold-water species from Lake Tovel, N. Italy, and on B-tenuissima comb. nov (syn. Woloszynskia tenuissima)",

abstract = "Using ultrastructure and nuclear-encoded large subunit (LSU) rDNA sequences, the woloszynskioid dinoflagellates have been shown recently to form a polyphyletic assemblage. The first group comprises the family Tovelliaceae, with the genera Tovellia and Jadwigia. The present manuscript describes the second group, comprising Borghiella dodgei gen. et sp. nov. from the Italian Alps. The new genus differs in a number of ultrastructural features, of which the most important are the structure of the eyespot (type B sensu Moestrup & Daugbjerg) and the structure of the apical part of the cell. The resting cyst is smooth, in contrast to the cysts of other woloszynskioids such as Tovellia and some species of Woloszynskia. The new species has been previously confused with Tovellia sanguinea, which was responsible for colouring the water of Lake Tovel, in the Italian Alps, blood-red up to 1964. However, B. dodgei may form brown, never truly red blooms as in the case of T. sanguinea. The transverse flagellum of Borghiella carries, in addition to thin hairs found also in other dinoflagellates, a row of shorter, thicker hairs resembling the curly hairs on the homologous, anterior flagellum of the perkinsid Parvilucifera but apparently not observed in any other dinoflagellates. Woloszynskia tenuissima, a well-known cold-water dinoflagellate, has been re-examined using material isolated from Greenland. Based on partial LSU rDNA sequencing it is shown to be related to R dodgei (sequence divergence only 1.1%) and is transferred to this genus as B. tenuissima comb. nov. We agree with the observations of von Stosch that the cysts of this species are spherical and smooth, in contrast to what was mentioned in the original description by Woloszynska.",

author = "{\O}jvind Moestrup and Gert Hansen and Niels Daugbjerg",

note = "Author KEYWORDS: freshwater; dinoflagellates; ultrastructure; taxonomy; phylogeny KEYWORDS Plus: FLAGELLAR APPARATUS; RIBOSOMAL-RNA; DINOPHYCEAE; DNA; ARCHITECTURE; MORPHOLOGY; EVOLUTION; POLARELLA; NETWORK; GROWTH",

year = "2008",

doi = "10.2216/07-32.1",

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T2 - on the ultrastructure and phylogeny of Borghiella dodgei gen. et sp nov., a cold-water species from Lake Tovel, N. Italy, and on B-tenuissima comb. nov (syn. Woloszynskia tenuissima)

AU - Moestrup, Øjvind

AU - Hansen, Gert

AU - Daugbjerg, Niels

N1 - Author KEYWORDS: freshwater; dinoflagellates; ultrastructure; taxonomy; phylogeny KEYWORDS Plus: FLAGELLAR APPARATUS; RIBOSOMAL-RNA; DINOPHYCEAE; DNA; ARCHITECTURE; MORPHOLOGY; EVOLUTION; POLARELLA; NETWORK; GROWTH

PY - 2008

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N2 - Using ultrastructure and nuclear-encoded large subunit (LSU) rDNA sequences, the woloszynskioid dinoflagellates have been shown recently to form a polyphyletic assemblage. The first group comprises the family Tovelliaceae, with the genera Tovellia and Jadwigia. The present manuscript describes the second group, comprising Borghiella dodgei gen. et sp. nov. from the Italian Alps. The new genus differs in a number of ultrastructural features, of which the most important are the structure of the eyespot (type B sensu Moestrup & Daugbjerg) and the structure of the apical part of the cell. The resting cyst is smooth, in contrast to the cysts of other woloszynskioids such as Tovellia and some species of Woloszynskia. The new species has been previously confused with Tovellia sanguinea, which was responsible for colouring the water of Lake Tovel, in the Italian Alps, blood-red up to 1964. However, B. dodgei may form brown, never truly red blooms as in the case of T. sanguinea. The transverse flagellum of Borghiella carries, in addition to thin hairs found also in other dinoflagellates, a row of shorter, thicker hairs resembling the curly hairs on the homologous, anterior flagellum of the perkinsid Parvilucifera but apparently not observed in any other dinoflagellates. Woloszynskia tenuissima, a well-known cold-water dinoflagellate, has been re-examined using material isolated from Greenland. Based on partial LSU rDNA sequencing it is shown to be related to R dodgei (sequence divergence only 1.1%) and is transferred to this genus as B. tenuissima comb. nov. We agree with the observations of von Stosch that the cysts of this species are spherical and smooth, in contrast to what was mentioned in the original description by Woloszynska.

AB - Using ultrastructure and nuclear-encoded large subunit (LSU) rDNA sequences, the woloszynskioid dinoflagellates have been shown recently to form a polyphyletic assemblage. The first group comprises the family Tovelliaceae, with the genera Tovellia and Jadwigia. The present manuscript describes the second group, comprising Borghiella dodgei gen. et sp. nov. from the Italian Alps. The new genus differs in a number of ultrastructural features, of which the most important are the structure of the eyespot (type B sensu Moestrup & Daugbjerg) and the structure of the apical part of the cell. The resting cyst is smooth, in contrast to the cysts of other woloszynskioids such as Tovellia and some species of Woloszynskia. The new species has been previously confused with Tovellia sanguinea, which was responsible for colouring the water of Lake Tovel, in the Italian Alps, blood-red up to 1964. However, B. dodgei may form brown, never truly red blooms as in the case of T. sanguinea. The transverse flagellum of Borghiella carries, in addition to thin hairs found also in other dinoflagellates, a row of shorter, thicker hairs resembling the curly hairs on the homologous, anterior flagellum of the perkinsid Parvilucifera but apparently not observed in any other dinoflagellates. Woloszynskia tenuissima, a well-known cold-water dinoflagellate, has been re-examined using material isolated from Greenland. Based on partial LSU rDNA sequencing it is shown to be related to R dodgei (sequence divergence only 1.1%) and is transferred to this genus as B. tenuissima comb. nov. We agree with the observations of von Stosch that the cysts of this species are spherical and smooth, in contrast to what was mentioned in the original description by Woloszynska.

U2 - 10.2216/07-32.1

DO - 10.2216/07-32.1

M3 - Journal article

SN - 0031-8884

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