1. Notice of some new Forms of British Fresh-Water Diatomaceæ.

Gregory, William

doi:10.1017/s0370164600028273

Cited by 5 publications

(3 citation statements)

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“…The diatoms of the British Isles have been studied intensively for more than 150 years, resulting in several floras (sMiTh 1853, 1856, hEndEy 1964, harTLEy et al 1996, many taxonomic and ecological papers containing species barcode does not circumscribe a deme or species; rather, it helps to determine what name is applicable once a population or set of populations has been distinguished. However, molecular barcodes also have the advantage over type specimens that they are direct samples of the genotype and can be used immediately in preliminary estimates of genetic and phylogenetic relationships (e.g.…”

Section: Discussionmentioning

confidence: 99%

Revision of the diatom genus Sellaphora: a first account of the larger species in the British Isles.

Mann¹,

Thomas²,

Evans³

2008

Fottea

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As a step towards a global monograph of the freshwater diatom genus Sellaphora, we made detailed surveys of Sellaphora diversity in the epipelon of 38 lakes and ponds and three Holocene diatomites in the British Isles, restricting our analysis to those specimens that would be classified in S. americana, S. bacillum, S. pupula or S. laevissima according to the standard European diatom flora of KraMMEr & LangE-BErTaLoT (1986; Süsswasser-flora von Mitteleuropa, vol. 2/1. -G. Fischer, Stuttgart & New York). From a total of c. 10 4 specimens observed, over 3200 were recorded as digital images and sorted into 54 mostly informally-named phenodemes that can act as operational taxonomic units during future revisions. Of the 54 phenodemes, c. 40 are well-differentiated, while the others seem to intergrade and are in particular need of further study using morphometric, molecular and mating approaches. The limitations of conventional diatom taxonomy by visual comparison are clearly demonstrated. To help standardize identifications, published DNA sequences are assigned to some of the demes as 'molecular barcode'. The phenodemes of S. pupula sensu lato cannot be equated with the infraspecific taxa previously recorded for the British Isles and both these and most other pre-1990 records of species now assigned to Sellaphora must be regarded as having very little value for ecological and biogeographical purposes. Possible non-British records of the phenodemes are discussed but few are totally convincing; of those records most likely to be of the same phenodemes, the majority come from elsewhere in Europe.

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Section: Discussionmentioning

confidence: 99%

Revision of the diatom genus Sellaphora: a first account of the larger species in the British Isles.

Mann¹,

Thomas²,

Evans³

2008

Fottea

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“…Gregory (1856) described and illustrated a new freshwater taxon, Pinnularia elginensis, which was subsequently transferred into Navicula by Ralfs (in Pritchard, 1861). Krammer & Lange‐Bertalot (1986) illustrated a lectotype specimen from BM 11751 (designated by R. Patrick), but also included specimens from BM 23510, which is the lectotype for Navicula tumida syn.…”

Section: Pinnularia Placentula Ehrenbergmentioning

confidence: 99%

Placoneis Mereschkowsky (Bacillariophyta) revisited: resolution of several typification and nomenclatural problems, including the generitype

Cox

2003

Botanical Journal of the Linnean Society

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The identity of three naviculoid diatoms originally described by Ehrenberg and now placed in the genus Placoneis was investigated. Type specimens and material from both the Ehrenberg Collection (Berlin) and the diatom collection at the Natural History Museum, London, were examined with LM and also SEM where possible. The concept of each species had changed since Ehrenberg named them. The current understanding of Placoneis gastrum and Navicula semen can be traced back to Donkin, and that of Placoneis placentula to Grunow. LM and SEM studies of N. semen support its transfer to Placoneis. It is proposed that the specific epithets gastrum and placentula should be conserved with conserved types to maintain established practice, and the name P. navicularis applied to N. semen sensu Donkin. Type material of Placoneis elginensis and Placoneis anglica was re‐examined from slides in the Natural History Museum and it was concluded that P. elginensis has been incorrectly applied to specimens of a second species, for which the name P. anglica was appropriate. The delimitation of these species, P. pseudanglica, and others previously included in P. elginensis is reviewed. LM and SEM observations of Navicula abiskoensis and Navicula amphibola support their transfer to Placoneis. Six new combinations are made for additional taxa belonging to Placoneis: P. constans, P. insignita, P. interglacialis, P. porifera, P. rostrata and P. subgastriformis. The systematic position of the genus Placoneis is reviewed. A revised generic description and a summary of the species currently assigned to Placoneis are included. © 2003 The Linnean Society of London, Botanical Journal of the Linnean Society, 2003, 141, 53–83.

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“…This was first described by Gregory (1856) as Pinnularia elginensis (lectotype= BM 11751) and was made a variety of Navicula dicephala by Cleve (1894 and 1838 (the "Infusionsthierchen"). Ehrenberg makes the following references to this species: in 1843, as N. dicephala; 1840, as Navicula (Pinnularia) dicephala; 1838, as N. dicephala and citing a paper of 1837 (which has not been checked) also calling it N. dicephala.…”

Section: Na Vicula Elginensis (Gregory) Ralfsmentioning

confidence: 99%

Some problems of diatom taxonomy in Scottish lake sediments

Haworth

1974

British Phycological Journal

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1. Notice of some new Forms of British Fresh-Water Diatomaceæ.

Cited by 5 publications

References 0 publications

Revision of the diatom genus Sellaphora: a first account of the larger species in the British Isles.

Revision of the diatom genus Sellaphora: a first account of the larger species in the British Isles.

Placoneis Mereschkowsky (Bacillariophyta) revisited: resolution of several typification and nomenclatural problems, including the generitype

Some problems of diatom taxonomy in Scottish lake sediments

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