�ber winterliche pflanzliche Bewohner des Wassers, Eises und des daraufliegenden Schneebreies. I

Schiller, Josef

doi:10.1007/bf01283404

Cited by 30 publications

(4 citation statements)

References 5 publications

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“…Gymnodinium hiemale (Schiller) Popovsky 1990 – This species was first described by Schiller as Massartia hiemalis from Rust, Germany during the winter [159] . He gave eight drawings of the species.…”

Section: Resultsmentioning

confidence: 99%

The Taxonomic Significance of Species That Have Only Been Observed Once: The Genus Gymnodinium (Dinoflagellata) as an Example

2012

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Taxonomists have been tasked with cataloguing and quantifying the Earth’s biodiversity. Their progress is measured in code-compliant species descriptions that include text, images, type material and molecular sequences. It is from this material that other researchers are to identify individuals of the same species in future observations. It has been estimated that 13% to 22% (depending on taxonomic group) of described species have only ever been observed once. Species that have only been observed at the time and place of their original description are referred to as oncers. Oncers are important to our current understanding of biodiversity. They may be validly described species that are members of a rare biosphere, or they may indicate endemism, or that these species are limited to very constrained niches. Alternatively, they may reflect that taxonomic practices are too poor to allow the organism to be re-identified or that the descriptions are unknown to other researchers. If the latter are true, our current tally of species will not be an accurate indication of what we know. In order to investigate this phenomenon and its potential causes, we examined the microbial eukaryote genus Gymnodinium. This genus contains 268 extant species, 103 (38%) of which have not been observed since their original description. We report traits of the original descriptions and interpret them in respect to the status of the species. We conclude that the majority of oncers were poorly described and their identity is ambiguous. As a result, we argue that the genus Gymnodinium contains only 234 identifiable species. Species that have been observed multiple times tend to have longer descriptions, written in English. The styles of individual authors have a major effect, with a few authors describing a disproportionate number of oncers. The information about the taxonomy of Gymnodinium that is available via the internet is incomplete, and reliance on it will not give access to all necessary knowledge. Six new names are presented – Gymnodinium campbelli for the homonymous name Gymnodinium translucens Campbell 1973, Gymnodinium antarcticum for the homonymous name Gymnodinium frigidum Balech 1965, Gymnodinium manchuriensis for the homonymous name Gymnodinium autumnale Skvortzov 1968, Gymnodinium christenum for the homonymous name Gymnodinium irregulare Christen 1959, Gymnodinium conkufferi for the homonymous name Gymnodinium irregulare Conrad & Kufferath 1954 and Gymnodinium chinensis for the homonymous name Gymnodinium frigidum Skvortzov 1968.

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Section: Resultsmentioning

confidence: 99%

The Taxonomic Significance of Species That Have Only Been Observed Once: The Genus Gymnodinium (Dinoflagellata) as an Example

2012

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“…As late as 1954 a new Chrysosphaerella species was described based on light‐microscopy (LM) without study of spines and scales (Schiller 1954). Physomonas ( Paraphysomonas de Saedeleer) was described by Stokes (1885) as colourless stalked monads with radiating bristles attached to the cell surface.…”

Section: Morphological Delineation Of Silica‐scaled Chrysophytesmentioning

confidence: 99%

“…The first Spiniferomonas species were described but misinterpreted as e.g. Mallomonas globosa (Schiller 1954), as the scales could not be investigated.…”

Section: Morphological Delineation Of Silica‐scaled Chrysophytesmentioning

confidence: 99%

“…The structure of scales and spines of Chrysosphaerella was studied by Korshikov (1942) and used in distinguishing between C. longispina and the new species C. brevispina . But as late as in 1954 a third species C. setifera was published without such information (Schiller 1954) and thus cannot be identified. Paraphysomonas scales of the only known species ( P. vestita ) were described by Korshikov (1929) as siliceous, with his method used for Synura , as circular plates bearing a central spine.…”

Section: Morphological Delineation Of Silica‐scaled Chrysophytesmentioning

confidence: 99%

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Developments in the taxonomy of silica‐scaled chrysophytes – from morphological and ultrastructural to molecular approaches

Škaloud

Kristiansen

Škaloudová

2013

Nordic Journal of Botany

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Taxonomy in silica‐scaled chrysophytes has gone through three morphological phases. From primary studies of the cell morphology in the 18th century, the focus was in the 20th century replaced by studies of the silica structures of the cell envelope. Now, in the latest decades the importance of DNA sequencing has been recognized, not only to support the taxonomic framework but also to obtain new understanding of taxonomic relations among particular taxa. In the first part of this review, we provide a historical overview of the developments in the taxonomy of scale‐bearing chrysophytes. In the second part, we present a phylogenetic reconstruction of chrysophyte algae, updated by newly obtained SSU rDNA and rbcL sequences of several isolated Synura, Mallomonas and Chrysosphaerella species. We detected significant incongruence between the phylogenies obtained from the different datasets, with the SSU rDNA phylogram being the most congruent with the morphological data. Significant saturation of the first rbcL codon position could indicate the presence of positive selection in the rbcL dataset. Within the Synurales, the relationships revealed by the phylogenetic analyses highlight the artificial infragenetic classification of Mallomonas and Synura, and the occurrence of cryptic diversity within a number of traditionally defined species. Finally, three new combinations are proposed based on the phylogenetic analyses: Tessellaria lapponica, Synura asmundiae and S. bjoerkii.

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Phytoplankton aus neu angelegten Streckteichen (Waldviertel, Niederösterreich)

Wawrik

1977

Intl Review of Hydrobiology

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The colonization of newly constructed fish‐ponds with phytoplankton is considered to be the result of inoculation by influents, airplankton and piscicultural measures. A considerable number of remarkable or new species have been observed, but bluegreen algae were extremely rare. The lack of a distinct seasonal succession in phytoplankton composition is attributed to the astatic character of the ponds. The following species are characteristic of the phytoplankton communities observed: Chlamydomonas sp., Chlorogonium elongatum v. plurivacuolatum, Cryptomonas sp., Cyclotella meneghiniana, C. pseudostelligera, Melosira varians, Pandorina morum.

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�ber winterliche pflanzliche Bewohner des Wassers, Eises und des daraufliegenden Schneebreies. I

Cited by 30 publications

References 5 publications

The Taxonomic Significance of Species That Have Only Been Observed Once: The Genus Gymnodinium (Dinoflagellata) as an Example

The Taxonomic Significance of Species That Have Only Been Observed Once: The Genus Gymnodinium (Dinoflagellata) as an Example

Developments in the taxonomy of silica‐scaled chrysophytes – from morphological and ultrastructural to molecular approaches

Phytoplankton aus neu angelegten Streckteichen (Waldviertel, Niederösterreich)

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