Gomphonella Rabenhorst, 1853
Lectotype species: Gomphonella olivacea (Hornemann) Rabenhorst
Original publication: Rabenhorst, L. (1853). Die Süsswasser-Diatomaceen (Bacillarien.): für Freunde der Mikroskopie. pp. [1]-xii, [1]-72, 10 plates [I–X]. Leipzig: Eduard Kummer.
Request PDFType designated in: Round, F.E., Crawford, R.M. & Mann, D.G. (1990). The diatoms. Biology and morphology of the genera. pp. [i-ix], 1-747. Cambridge: Cambridge University Press.
Description: The most important and conspicuous feature of this genus visible in LM, separating it from other gomphonemoid taxa, is that there are no stigmoids or stigmata present on the valve face. A further conspicuous trait separating it from Gomphonema s. str. but visible only in SEM is the bi- to triseriate striation with small round uniform areolae not occluded by siliceous flaps. The diameter of the areolae is about 100 nm. The striae sit in moderately deep alveolae between thicker vimines. The striae continue onto the valve mantle. The apical foot pole is composed of a bilobed field of porelli which are round and similar to the normal areolae in the striae (= undifferentiated AFPs). The raphe is filiform and either straight or very slightly undulate at both apices. Internally, both polar raphe endings end in prominent helictoglossae well away from the valve terminus and there is an intermissio in the centre with the raphe endings slightly bent to the same side. The pseudosepta are distinct and prominent at both apices. At least two girdle bands belong to each valve and open alternately at either pole; each bears a line of pores along the junction between pars exterior and pars interior.
Information contributed by: Jahn et al. 2019. The most recent alteration to this page was made on 2020-04-30 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Gender: This genus name is currently treated as feminine.
Most recent taxonomic treatment adopted: Jahn, R., Kusber, W.-H., Skibbe, O., Zimmermann, J., Van, A.T., Buczkó, K. & Abarca, N. (2019). Gomphonella olivacea (Bacillariophyceae) - a new phylogenetic position for a well-known taxon, its typification, new species and combinations. Plant Ecology and Evolution 152(2): 219-247, 14 figs, 2 tables.
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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,
organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA)
and intended to be published in CD format.
These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above.
The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.
Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.
Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=46822
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 30 April 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024
