Ochrosphaera neapolitana, nov. gen., nov. spec., eine neue Chrysomonade mit Kalkhülle

Schussnig, Bruno

doi:10.1007/bf01844773

Cited by 9 publications

(5 citation statements)

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“…Both show the same coccolith vari-monomorphism in coccolith-bearing cells, the only difference being the dominance of non-calcifying mucilage-covered cells in strain 162. It seems likely that all work on Ochrosphaera since Schussnig (1930Schussnig ( , 1940 is on a single species, O. neapolitana. However, Schussnig (1940) clearly observed other organisms when he created two new species, O. verrucosa and O. rovignensis.…”

Section: Taxonomymentioning

confidence: 99%

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The ultrastructure and life cycle of the coastal coccolithophoridOchrosphaera neapolitana(Prymnesiophyceae)

Fresnel¹,

Probert²

2005

European Journal of Phycology

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Unialgal cultures of the widespread tremalith-bearing coccolithophorid Ochrosphaera neapolitana Schussnig were investigated using light and electron microscopy. O. neapolitana exhibits a heteromorphic life cycle identical to that described for the closely related tremalith-bearing genus Hymenomonas, involving an alternation between (diploid) coccolith-bearing cells and a (haploid) non-calcifying phase, characterised by the production of layers of mucilage. Differing scale ornamentation between the two phases together with chromosome counts confirms the diplo-haplontic nature of this cycle. The coccolith-bearing phase may be non-motile or possess flagella. The coccoliths of all strains studied exhibit the typical tremalith structure, but variation in size and shape is observed (vari-monomorphism). Unusual among coccolithophorids, the coccosphere of this species is not continually renewed, and progressive extracellular calcification of the coccoliths is observed in old cultures that may result in the formation of a calcareous 'pseudocyst'. At the ultrastructural level, the flagellar apparatus is of the Pleurochrysis type, consisting of two flagellar basal bodies linked by proximal, intermediary and distal bands, a vestigial haptonema consisting of five microtubules, and four asymmetrically arranged microtubular roots. Two roots are compound, each possessing a secondary crystalline microtubular component, and two are simple. The peripheral endoplasmic reticulum plays a role in coccolithogenesis, which occurs in the proximity of the plasma membrane. The taxonomy of the genus Ochrosphaera is discussed and suppression of the two other species in the genus, O. verrucosa Schussnig and O. rovignensis Schussnig, is suggested.

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Section: Taxonomymentioning

confidence: 99%

“…The genus Ochrosphaera was created by Schussnig (1930) for a single species, Ochrosphaera neapolitana. Like the genus Hymenomonas, Ochrosphaera is characterised by the presence of tremaliths (vase-shaped coccoliths calcified only on the rim of the baseplate scale).…”

Section: Introductionmentioning

confidence: 99%

The ultrastructure and life cycle of the coastal coccolithophoridOchrosphaera neapolitana(Prymnesiophyceae)

Fresnel¹,

Probert²

2005

European Journal of Phycology

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“…However, Schiller (1930 and Braarud (1954) consider that these species are synonymous with H. roseola. (28) Ochrosphaera verrucosa Schussnig, 1930, is here considered to be a synonym of O. neapolitana (Gayral, personal communication to RWJ, 1991). 29 (30) Papposphaera arctica has a holococcolith-bearing phase previously described as Turrisphaera arctica Manton et al (Manton et al, 1976b).…”

Section: Check-list Divisionmentioning

confidence: 99%

“…Oolithotus Reinhardt in Cohen et Reinhardt, 1968 O. antillarum (Cohen) Reinhardt in Cohen et Reinhardt, 1968 O.fragilis (Lohmann) Martini et Miiller, 1972 Umbilicosphaem Lohmann, 1902 U. angustiforamen U. hulburtiana Gaarder, 1970 U. maceria Okada et Mclntyre, 1977 Gayral et Fresnel, 1979 H. coronata Mills, 1975 H. globosa (Magne) Gayral et Fresnel, 1976 H. lacuna Pienaar, 1976 H. prenantii Lecal, 1965 H. roseola Stein, 1878 (27) Ochrosphaera Schussnig, 1930 O. neapolitana Schussnig, 1930 (28) Family: PAPPOSPHAERACEAE Jordan et Young, 1990 Norris, 1983 Trigonaspis Thomsen, 1980 T. diskoensis Thomsen, 1980 (32) T. melvilleae Thomsen in Thomsen et al, 1988 orthog. emend.…”

Section: N Coccolithomorphamentioning

confidence: 99%

A check-list of the extant Haptophyta of the world

Jordan

Green

1994

J. Mar. Biol. Ass.

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Members of the Haptophyta from British waters have been listed in a number of check-lists between 1953 and 1976 (Parke, 1953; Parke & Dixon, 1964, 1968, 1976), but there has been no attempt to draw the records together on a world-wide basis. However, a recent review of the classification system of the coccolithophorids included a check-list of all species thought to be extant from marine, coastal and freshwater habitats (Jordan & Kleijne, 1994). At the same time, two ambitious projects, theEncyclopaedia of Algal Genera(ed. B.C. Parker, in preparation) and the preparation of a CD-ROM retrieval system for information on algal and protist groups by the Expert-Centre for Taxonomic Identification (ETI), have required further collation of the available records (see Note 1), and, as a result, we have now extended the scheme of Jordan & Kleijne (1994) to include a global list of all extant haptophytes.

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“…Thus, all the Ochrosphaera strains in this study fit the cell size for O. neopolitana, the type species. Ochrosphaera neapolitana was originally described using isolates collected from the coast of Naples, Italy [33]. Two additional species, O. verrucosa and O. rovignensis, were described by the same author using samples collected from the Adriatic Sea coastline in what is now Croatia [34].…”

Section: Phylogenetic Relationships and Morphological Characteristics...mentioning

confidence: 99%

Plastid Genome Evolution of Two Colony-Forming Benthic Ochrosphaera neapolitana Strains (Coccolithales, Haptophyta)

Lhee

Andersen

et al. 2023

IJMS

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Coccolithophores are well-known haptophytes that produce small calcium carbonate coccoliths, which in turn contribute to carbon sequestration in the marine environment. Despite their important ecological role, only two of eleven haptophyte plastid genomes are from coccolithophores, and those two belong to the order Isochrysidales. Here, we report the plastid genomes of two strains of Ochrosphaera neapolitana (Coccolithales) from Spain (CCAC 3688 B) and the USA (A15,280). The newly constructed plastid genomes are the largest in size (116,906 bp and 113,686 bp, respectively) among all the available haptophyte plastid genomes, primarily due to the increased intergenic regions. These two plastid genomes possess a conventional quadripartite structure with a long single copy and short single copy separated by two inverted ribosomal repeats. These two plastid genomes share 110 core genes, six rRNAs, and 29 tRNAs, but CCAC 3688 B has an additional CDS (ycf55) and one tRNA (trnL-UAG). Two large insertions at the intergenic regions (2 kb insertion between ycf35 and ycf45; 0.5 kb insertion in the middle of trnM and trnY) were detected in the strain CCAC 3688 B. We found the genes of light-independent protochlorophyllide oxidoreductase (chlB, chlN, and chlL), which convert protochlorophyllide to chlorophyllide during chlorophyll biosynthesis, in the plastid genomes of O. neapolitana as well as in other benthic Isochrysidales and Coccolithales species, putatively suggesting an evolutionary adaptation to benthic habitats.

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Ochrosphaera neapolitana, nov. gen., nov. spec., eine neue Chrysomonade mit Kalkhülle

Cited by 9 publications

References 0 publications

The ultrastructure and life cycle of the coastal coccolithophoridOchrosphaera neapolitana(Prymnesiophyceae)

The ultrastructure and life cycle of the coastal coccolithophoridOchrosphaera neapolitana(Prymnesiophyceae)

A check-list of the extant Haptophyta of the world

Plastid Genome Evolution of Two Colony-Forming Benthic Ochrosphaera neapolitana Strains (Coccolithales, Haptophyta)

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