Gomphosphenia Lange-Bertalot, 1995

Holotype species: Gomphosphenia lingulatiformis (Lange-Bertalot & E.Reichardt) Lange-Bertalot

Original publication and holotype designation: Lange-Bertalot, H. (1995). Gomphosphenia paradoxa nov. spec. et nov. gen. und Vorschlag zur Lösung taxonomischer Probleme infolge eines veränderten Gattungskonzepts von Gomphonema (Bacillariophyceae). Nova Hedwigia 60(1-2): 241-252.

Description: Frustein in Gürtelansicht von annähernd rechteckig bis breit keilförmig, niemals geknickt oder gekrümmt, sondern gerade und niemals hetero- sondern isovalvat. Im Gegensatz zur Gattung Rhoicosphenia sind auch die Rapbensysteme auf beiden Schalen jeder Frustel gleichförmig. Schalen schwach bis stark heteropol keulenförmig, vergleichbar den Gattungen Cuneolus, Gomphonemopsis, Gomphoseptata. Flächen beider Schalen weder konvex noch konkav, sondern flach, Pseudosepten an beiden Schalenpolen oder fehlend. Porenfelder fehlen. Rapbenäste gerade mit kleinen oder größeren Zentralporen, Punkt-förmigen Terminalporen oder T -förmig gestalteten Terminalspalten. Areoienforamina einfach, meistens kürzer bis länger schlitzförmig und meistens auf Fläche und Mantel der Schalen zwei durch einen unperforierten Mantelrand getrennte Systeme bildend, vergleichbar Gomphonemopsis. Siebmembranen (ähnlich Brachysira) den inneren Areoienöffnungen aufliegend, vom Sternum ohne erkennbare Unterbrechungen bis auf den Mantellaufend oder (anscheinend) fehlend. Jeder Schalengürtel mit mehreren einseitig offenen Bändern. [Frustrule in belt view from almost rectangular to broadly wedge-shaped, never bent or curved, but straight and never hetero- but isovalvate. In contrast to the genus Rhoicosphenia, the rape systems on both shells of each frustel are also uniform. Shells weakly to strongly heteropolous club-shaped, comparable to the genera Cuneolus, Gomphonemopsis, Gomphoseptata. Surfaces of both shells neither convex nor concave, but flat, pseudosepta at both shell poles or missing. Pore ??fields are missing. Rape branches straight with small or larger central pores, point-shaped terminal pores or T-shaped terminal gaps. Areoial foramina simple, usually shorter to longer slit-shaped and usually forming two systems on the surface and mantle of the shells separated by an imperforate mantle edge, comparable to Gomphonemopsis. Sieve membranes (similar to Brachysira) overlying the internal areoial openings, running from the sternum to the mantle without noticeable interruptions or (apparently) missing. Each cup belt with several straps open on one side.]

Information contributed by: Original description.. The most recent alteration to this page was made on 2024-10-23 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: Gonzáles-Paz, L., Almeida, S.F.P., Blanck, S. & Delgado, C. (2022). A new species of an unexplored diatom genus: Gomphosphenia minima sp. nov. (Cymbellales, Rhoicospheniaceae). Phytotaxa 554(2): 135-148, 46 figs, 1 table.

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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=45572

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 23 October 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024