Microfissurata H.Lange-Bertalot, M.Cantonati & B.Van de Vijver, 2009
Holotype species: Microfissurata paludosa Cantonati & Lange-Bertalot
Original publication and holotype designation: Cantonati, M., Van de Vijver, B. & Lange-Bertalot, H. (2009). Microfissurata gen. nov. (Bacillariophyta), a new diatom genus from dystrophic and intermittently wet terrestrial habitats. Journal of Phycology 45(3): 732-741, 3 figs, 2 tables.
Description: Cells comparatively small, usually less than or equal to 20 µm, living solitarily. One lobed plastid. Frustules naviculoid as to symmetry and raphe system. Valves lanceolate or linear elliptical, with more or less protracted ends. The central external fissures of the filiform raphe only very slightly deflected to the primary side; distal raphe ends deflected to the secondary side, and as simple terminal fissures onto the mantle. Central internal raphe ends deflected to the primary side as on the valve outside or even slightly hooked; internal raphe branches end in very small, hemispheric polar helictoglossae. Axial area wide or very wide, and enlarging toward the central area, which is an apically rather expanded fascia, without shortened striae at the margins. Transapical striae on the valve face are open slits externally (microfissures), and completely closed internally by delicate hymenes, which lie slightly depressed in the alveoli, and are often corroded in prepared valves. Areolae are completely missing, or few subpolar striae subdivided by single silica bridge at the junction between face and mantle . The girdle consists of few nonporous copulae. Valve face almost flat, curving gently into the mantles . The thin and very densely spaced striae can be clearly distinguished at the LM only by means of oblique lighting. Central raphe endings placed rather distantly from each other.
Origin of description: this description is from the original publication; it may have been modified slightly. The most recent alteration to this page was made on 2015-05-04 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Most recent taxonomic treatment adopted: Cox, E.J. (2015). Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae (Diatoms). In: Sylabus of plant families. Adolf Engler's Syllabus der Pflanzenfamilien. 13th Ed. Photoautotrophic eukaryotic algae Glaucocystophyta, Cryptophyta, Dinophyta/Dinozoa, Heterokontophyta/Ochrophyta, Chlorarachniophyta/Cercozoa, Euglenophyta/Euglenozoa, Chlorophyta, Streptophyta p.p. (Frey, W. Eds), pp. 64-103. Stuttgart: Borntraeger Science Publishers.
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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=50935
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 04 May 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 11 December 2023