Planothidium F.E. Round & L. Bukhtiyarova; 1996; 351
Key references
Round F.E., Bukhtiyarova L. 1996. Four new genera based on Achnanthes (Achnanthidium) together with a re-definition of Achnanthidium. Diatom Research. 11(2): 345-361.
Jahn R., Abarca N., Gemeinholzer B., Mora D., Skibbe O., Kulikovskiy M., Gusev E., Kusber W.-H., Zimmermann J. 2017. Planothidium lanceolatum and Planothidium frequentissimum reinvestigated with molecular methods and morphology: four new species and the taxonomic importance of the sinus and cavum. Diatom Research. 32(1): 75-107.
Wetzel C.E., Van de Vijver B., Blanco S., Ector L. 2019. On some common and new cavum-bearing Planothidium (Bacillariophyta) species from freshwater. Fottea, Olomouc. 19(1): 50-89.
Morphology
Frustules heterovalvar, isopolar, bilaterally symmetrical. Raphe valve slightly concave, rapheless valve correspondingly slightly convex; in girdle view, frustules arched.
Cells usually lie in valve view, Valve outline elliptical, elliptical-lanceolate or lanceolate, with a shallow mantle; apices rounded, rostrate, capitate or apiculate.
Striae bi- or multiseriate, radial or (more rarely) parallel, usually interrupted on one side of the centre in the rapheless valve by a horseshoe-shaped plain area (the ‘hufeisenförmige Fleck’, which is hollow internally and may be partly covered by a hood (canopy) visible in LM as a curved line crossing the space.
Axial area narrow and linear in the raphe valve, sometimes wider in the rapheless valve.
Central area indistinguishable from the axial area, rounded or transversely elongate; central area asymmetrical on the rapheless valve when the horseshoe-shaped area is present.
Raphe straight, external central endings expanded, internal central endings deflected in opposite directions (noncoaxial, offset); external terminal raphe endings deflected to one side.
Girdle bands open.
A single chloroplast, with a single pyrenoid located below the horseshoe-shaped area.
Attached to the substratum via the valve face of the raphe valve.
Cells usually lie in valve view, Valve outline elliptical, elliptical-lanceolate or lanceolate, with a shallow mantle; apices rounded, rostrate, capitate or apiculate.
Striae bi- or multiseriate, radial or (more rarely) parallel, usually interrupted on one side of the centre in the rapheless valve by a horseshoe-shaped plain area (the ‘hufeisenförmige Fleck’, which is hollow internally and may be partly covered by a hood (canopy) visible in LM as a curved line crossing the space.
Axial area narrow and linear in the raphe valve, sometimes wider in the rapheless valve.
Central area indistinguishable from the axial area, rounded or transversely elongate; central area asymmetrical on the rapheless valve when the horseshoe-shaped area is present.
Raphe straight, external central endings expanded, internal central endings deflected in opposite directions (noncoaxial, offset); external terminal raphe endings deflected to one side.
Girdle bands open.
A single chloroplast, with a single pyrenoid located below the horseshoe-shaped area.
Attached to the substratum via the valve face of the raphe valve.
Literature
References are given in chronological order.
Reference |
Citation |
|---|---|
| Round F.E., Bukhtiyarova L. 1996. Four new genera based on Achnanthes (Achnanthidium) together with a re-definition of Achnanthidium. Diatom Research. 11(2): 345-361. | Morphology; Taxonomy; Description; Type Illustration; |
| Lange-Bertalot H. 1999. Neue Kombinationen von Taxa aus Achnanthes Bory (sensu lato). 6. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 6. Phytogeography-Diversity-Taxonomy. Koeltz Scientific Books, Königstein, Germany. 276-289 pp | Taxonomy |
| Krammer K., Lange-Bertalot H. 2004. Süßwasserflora Mitteleuropas. Bacillariophyceae. 4. Teil. Achnanthaceae. Kritische Ergänzungen zu Achnanthes s.l., Navicula s.str., Gomphonema. Eds Ettl H., Gärtner G., Heynig H., Mollenhauer D., Gustav Fischer Verlag, Stuttgart. 468 pp | Taxonomy; Illustrations; Morphology |
| Morales E.A. 2006. Small Planothidium Round et Bukhtiyarova (Bacillariophyceae) taxa related to P. daui (Foged) Lange-Bertalot from the United States. Diatom Research. 21(2): 325-342. | Morphology; Taxonomy; Illustrations |
| Van de Vijver B., Wetzel C., Kopalova K., Zidarova R,. Ector L. 2013. Analysis of the type material of Achnanthidium lanceolatum Brébisson ex Kützing (Bacillariophyta) with the description of two new Planothidium species from the Antarctic Region. Fottea, Olomouc. 13(2): 105–117. | Morphology; Taxonomy; Illustrations |
| Wetzel C.E., Van de Vijver B., Hoffmann L., Ector L. 2013. Planothidium incuriatum sp. nov. a widely distributed diatom species (Bacillariophyta) and type analysis of Planothidium biporomum. Phytotaxa. 138(1): 43-57. | Morphology; Taxonomy; Illustrations |
| Jahn R., Abarca N., Gemeinholzer B., Mora D., Skibbe O., Kulikovskiy M., Gusev E., Kusber W.-H., Zimmermann J. 2017. Planothidium lanceolatum and Planothidium frequentissimum reinvestigated with molecular methods and morphology: four new species and the taxonomic importance of the sinus and cavum. Diatom Research. 32(1): 75-107. | Morphology; Biology; Illustrations |
| Van de Vijver B., Wetzel C.E., Ector L. 2018. Analysis of the type material of Planothidium delicatulum (Bacillariophyta) with the description of two new Planothidium species from the sub-Antarctic Region. Fottea, Olomouc. 18(2): 200-211. | Morphology; Taxonomy; Illustrations |
| Wetzel C.E., Van de Vijver B., Blanco S., Ector L. 2019. On some common and new cavum-bearing Planothidium (Bacillariophyta) species from freshwater. Fottea, Olomouc. 19(1): 50-89. | Morphology; Taxonomy; Illustrations |
This page should be cited as:
Jüttner I. Planothidium F.E. Round & L. Bukhtiyarova; 1996; 351. In: Jüttner I., Carter C., Cox E.J., Ector L., Jones V., Kelly M.G., Kennedy B., Mann D.G., Turner J. A., Van de Vijver B., Wetzel C.E., Williams D.M..
Freshwater Diatom Flora of Britain and Ireland. Amgueddfa Cymru - National Museum Wales. Available online at https://naturalhistory.museumwales.ac.uk/diatoms/browsespecies.php?-recid=3731. [Accessed:
].
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Record last modified: 27/12/2020